1991 C4 Corvette

1991 Corvette Overview

With the arrival of the ZR-1 in 1990, the Corvette had once more been elevated to a stature that had been missing since the early seventies.  The “King of the Hill” had arrived and had met or exceeded the expectations of most enthusiasts and automobile reviewers alike.

Its arrival had been anticipated for so long that prospective buyers gladly paid well in excess of the $58,995 list price. And yet, as fate would have it, the high priced ZR-1 that was so widely embraced in 1990 would be the same car that would ultimately bring about its own decline beginning just a year later in 1991.

Model: 1991 Corvette
Generation: C4 Corvette
Type: 2 Door Coupe, 2 Door Convertible
Available Colors: White, Steel Blue Metallic, Yellow, Black, Turquoise Metallic, Dark Red Metallic, Quasar Blue Metallic, Bright Red, Polo Green Metallic, Charcoal Metallic
Engine: Base Model: 350CI 240/245 Horsepower, Tuned-Port Fuel Injected L98 V8 Engine. ZR-1: 350CI 375 Horsepower, LT5 V8 Engine
VIN: 1G1YY2386M5100001 – 1G1YY2386M5118595 (Corvette Coupe & Convertible)
1G1YZ23J6M5800001 – 1G1YZ23J6M5802044 (ZR-1 Corvette)
Transmission: 4-speed automatic (standard), 6 speed manual (optional)
Original Price: $32,455.00 (Coupe), $38,770.00 (Convertible)
Units Produced: 20,639
Specs: 1991 Corvette Spec List
1991 Corvette
Seeing Double? No, but the lack of physical differences between the base Corvette (top) and the far more expensive ZR-1 (bottom) may have led to it’s rapid decline in popularity amongst sports car enthusiasts.

While there was no mistaking the ZR-1’s high-tech approach to mastering triple-digit speeds on command, there were glaring deficiencies elsewhere in the car that adversely impacted the ZR-1’s success in the commercial market place.

Admittedly, despite the hefty $31,683 premium that accompanied the RPO ZR1 package option (note that this was in addition to the already expensive $32,455 base coupe price tag), the ZR-1 Corvette was still far more affordable than most exotic European sports cars.  The most glaring (and looking back, most obvious) criticism of the ZR-1 was the minimal styling enhancements to the body and interior of the car.

While, by comparison, there was no mistaking a Porsche 911 from a Porsche 944, it took a trained eye to discern the differences between the base coupe and the far more expensive ZR-1

What made things worse for the 1991 model year was the fact that Chevrolet further blurred the line between the two Corvettes when they introduced some cosmetic enhancements to the 1991 base model coupe and convertible.

While the ZR-1 did retain its unique doors and rear fenders that were required to accommodate the 11-inch-wide rear wheels and tires, the standard coupe and convertible received a ZR-1 inspired rear fascia, with a similar convex styling and four rectangular shaped tail lamps.  With this new backend on the base Corvettes, the only distinguishing features of the ZR-1 that remained were the slightly wider rear flanks, the roof-mounted center stop-lamp, and a single badge to distinguish a ZR-1 from a base coupe. In contrast, on 1991 (and beyond) base coupes and convertibles, the third taillight was integrated into the rear fascia just above the CORVETTE emblem.

Another devastating event to adversely impact the ZR-1 line came from outside anything that Chevrolet could readily counteract.  In early 1991, Dodge announced that they would be introducing an all-new sports car as part of their 1992 model line – the Dodge Viper.  The Viper would include a 400 horsepower V-10 engine and promised sports car enthusiasts a more expressive way to spend their performance-car dollars.  Hailed as “offering some of the most aggressive race-car looks to date”, the Shelby Cobra inspired Dodge Viper would have a dramatically negative impact on the sale of ZR-1’s over the course of the 1991 model year.  Where Chevrolet had planned on selling 4000-8000 ZR-1’s per year, total sales of the super Corvette dropped to just 2,044 units in 1991. It appeared that, despite its initial novelty and promise of unsurpassed performance, the ZR-1 had quickly degenerated into “yesterday’s news

Making matters even worse for GM, it was determined that an all-new Corvette, which had originally been projected for a 1995 arrival, would still be several years away.  Due largely to their struggling financial situation, GM’s top brass delayed the program until as late as 1998.  In fact, overall Corvette sales had waned so dramatically that Chevrolet General Manager Jim Perkins was brought before the GM brass to determine whether Chevrolet should continue to produce the Corvette at all.  Though ultimately it was agreed that the Corvette would, and should, continue as the division’s flagship, it was also agreed that, until financial conditions improved, Chevrolet would not have the ability to fund the research necessary to develop a mid-engine model, (an endeavor that had been the silent ambition of Corvette designers for generations).

1991 Corvette wheels
The 1991 Corvette received an all-new wheel design for both the base model and ZR-1 versions.

Despite these setbacks, 1991 was not all bad news for the Chevy Corvette.

Cosmetically, the C4 Corvette received many additional enhancements to those listed earlier, including a smoother, slimmer front fascia with wraparound parking/cornering/fog lights, wider body-side moldings that were now painted to match the body color, and horizontal front-fender strakes that replaced the previous gill-like louvers.

Additionally, the 9.5 inch wide aluminum wheels were re-designed and now featured a turbine-like appearance.

While the cosmetic makeup of the 1991 Corvette’s interior remained largely unchanged, it did receive a number of mechanical/electrical updates that improved overall operability.

1991 ZR-1 Corvette Interior
1991 ZR-1 Corvette Interior. Note the key switch below the car stereo. This switch enables the “VALET” mode when selected.

A new power-delay feature was added to the audio system and power windows which allowed both to operate after the ignition was switched off until such time as either the driver or passenger doors were opened or for a maximum of fifteen minutes (whichever came first.)

Additionally, a “low oil” indicator was added to the driver information center, and all models were pre-wired to accommodate a cellular telephone or other 12-volt accessory.  On the ZR-1’s, the “full power” indicator light was relocated to alongside the valet-selection key.

The Corvette’s exhaust system underwent some revisions for 1991.  Included in the update were larger muffler sections with a more finely tuned exhaust note and lower back pressure.  While the introduction of these new mufflers was intended to add power to the existing L98 engine, the horsepower ratings remained unchanged.  In addition to the upgraded exhaust system, a finned power-steering cooler was also installed with the intent of improving performance.

Continuing beneath the car, the suspension package was revamped for 1991 as well.  New for the 1991 Corvette was RPO Z07.  Priced at $2155, this option effectively combined the previous Z51 performance handling package with the FX3 selective ride and handling option.  It offered prospective owners the option of an all heavy-duty suspension system that drivers could manually adjust the ride characteristics between “firm” and “very firm”.  Limited only to Corvette coupes, the Z07 package was intended for true sports car enthusiasts and racers.
The World Challenge racing series was continued in 1991, but Chevrolet no longer offered a specially modified Corvette to run in the series.  Instead, consumers would have to purchase a Corvette and perform the modifications themselves.

DID YOU KNOW: The 1991 model year marked the 10th anniversary of the Chevy Corvette’s production at the Bowling Green Corvette Assembly Plant in southern Kentucky.

1991 also marked the final year for the dealer installed Callaway Twin-Turbo package.  Much like the ZR-1 option, dwindling sales drove Chevrolet executives to make the decision to discontinue the Callaway option.  In fact, only sixty-two Callaway Corvettes were sold in 1991 (at an additional $33,000 a piece).  Despite the dwindling sales numbers of Callaway Corvettes, Chevrolet did recognize the build of the 500th Callaway Corvette on September 26, 1991.  The subsequent Callaway Corvettes that rolled off the assembly line were dubbed “Callaway 500” and could be specially optioned (for an additional $600.00) to include a series of commemorative “Callaway 500” badges

1991 Twin-Turbo Callaway Speedster
The 1991 Twin-Turbo Callaway Speedster Corvette Convertible

Notwithstanding Chevrolet’s decision to discontinue the Callaway line as part of Corvette’s RPO (available options package), Reeves Callaway introduced a Corvette conversion kit of his own for the 1991 model year.  Dubbed the Twin-Turbo Callaway Speedster convertible, this aftermarket variant mated two turbo-chargers to the L98 engine to produce 450 horsepower and 600 lbs/ft of torque.  The 1991 Speedster was somewhat reminiscent of the earlier 1988 Corvette Sledgehammer, although its overall appearance was more aerodynamic.  The Speedster featured O.Z. brand racing wheels and a Connolly leather interior.  Priced at $107,000 (and higher), a total of 10 of these cars were built in 1991.

Overall, sales of the 1991 Chevy Corvette followed the downward trend started earlier in the model year by the ZR-1.  In all, 20,639 units were sold, with coupes outselling convertibles at a ratio of about three-to-one.

With the ZR-1’s sales numbers crumbling around them, and with General Motors unable to fund the development of an all-new Corvette for the foreseeable future, Corvette engineers knew that a happy medium would have to be reached between the performance limited L98 base model and the overly priced ZR-1.

If Corvette was going to retain its stature as a true American sports car against future competitors like the Dodge Viper, there was no question that improvements would have to be made to ensure that every Corvette – not just the super exclusive ZR-1 – would be able to hold its own in the future.

See full 1991 CY Corvette Image Gallery


1991 Corvette Specifications

1991 Corvette Main Specs

MODEL: 1991 Chevrolet Corvette
BODY STYLE: Two-door Coupe/Hatchback, front engine, rear wheel drive
MANUFACTURING LOCATION: Bowling Green, Kentucky
CONSTRUCTION: Fiberglass body, unibody construction with partial, front frame including both steel and stainless steel components.
VEHICLE NUMBERS (VIN): 1G1YY2386M5100001 THRU 1G1YY2386M5118595
1G1YZ23J6M5800001 THRU 1G1YZ23J6M5802044 (ZR-1)
VIN SUFFIX: ZTA: 350 CUBIC INCH, 245/250 HP, AUTOMATIC TRANS
ZTB: 350 CUBIC INCH, 245/250HP, MANUAL TRANS. ENGINE OIL COOLER
ZTC: 350 CUBIC INCH, 245/250HP, AUTO TRANS, ENGINE OIL COOLER
ZTK: 350 CUBIC INCH, 375HP
ENGINE BLOCK NUMBER: 10153558: 350 CUBIC INCH, 375 HORSEPOWER
14093638: 350 CUBIC INCH, 245/250 HORSEPOWER
HEAD NUMBER: 10088113: 350 CUBIC INCH, 245/250 HORSEPOWER
10174390: 350 CUBIC INCH, 375 HORSEPOWER (RIGHT HAND)
10174389: 350 CUBIC INCH, 375 HORSEPOWER (LEFT HAND)
Note: For Callaway Twin-Turbo, Chevrolet engine coding was replaced as follows: First two digits for year, next three digits for Callaway sequence, last four digits to match the last four digits of the vehicle identification number.

1991 Corvette Pricing & Options

CODE: DESCRIPTION: QUANTITY: RETAIL PRICE:
1YY07
Base Corvette Sport Coupe
14,967
$32,455.00
1YY67
Base Corvette Convertible
5,672
$38,770.00
AC1
Power Passenger Seat
17,267
$290.00
AC3
Power Driver Seat
19,937
$290.00
AQ9
Sport Seats, leather
10,650
$1,050.00
AR9
Base Seats, leather
9,505
$425.00
B2K
Callaway Twin Turbo (not GM installed)
71
$33,000.00
CC2
Auxillary Hardtop (convertible)
1,230
$1,995.00
C2L
Dual Removable Roof Panels (coupe)
5,031  $915.00
24S
Removable Roof Panel, blue tint (coupe)
 6,991
$615.00
 64S  Removable Roof Panel, bronze tint (coupe) 3,036
$615.00
C68
Electronic Air Conditioning Control
19,233
$180.00
FX3
Selective Ride and Handling, electronic
6,894
$1,695.00
G92
Performance Axle Ratio
3,453
$22.00
KC4
Engine Oil Cooler
7,525
$110.00
MN6
6-Speed Manual Transmission
5,875
$0.00
NN5
California Emission Requirements
3,050
$100.00
UJ6
Low Tire Pressure Warning Indicator
 5,175
$325.00
UU8
Stereo System, Delco-Bose
3,786
$823.00
U1F
Stereo System With CD, Delco-Bose
15,345  $1,219.00
 V56 Luggage Rack (convertible) 886
$140.00
 Z07 Adjustable Suspension Package (coupe) 733
$2,155.00
ZR1
Special Performance Package  (coupe)
2,044
$31,683.00

1991 Corvette

1991 Corvette Exterior & Interior Colors

Color Options

CODE  EXTERIOR  TOTAL SOFT TOP INTERIOR
10 White 4,305 Black, Beige, White Blue, Black, Grey, Red, Saddle
25 Steel Blue Metallic 835 Blue, Black, White
Blue, Black
35 Yellow 650
Black, Beige, White
Black, Grey, Saddle
41 Black 3,909
Black, Beige, White
Blue, Black, Grey, Red, Saddle
42 Turquoise Metallic 1,621
Black, Beige, White
Black, Saddle
75 Dark Red Metallic 1,311
Blue, Black
Black, Saddle
80 Metallic 1,038
Black, Beige, White
Black, Saddle
81
Bright Red
5,318
Black, Beige
Black, Grey, Red, Saddle
91
Polo Green Metallic
1,230
Black, Beige, White
Black, Saddle
96
Charcoal Metallic
417
Black, Beige
Black, Grey, Saddle

Exterior Colors

1991 Corvette Colors

Interior Colors

1991 Corvette Colors Interior

1991 Corvette

1991 Corvette Powertrain Specifications

Engine (Coupe/Convertible)

Engine: L98 5.7 OHV 350 V-8. Tuned-Port Fuel Injection (COUPE)
Cylinders: V8
Block Material:
Cast Iron Alloy
Displacement: 5.7 Litre/350 Cubic Inches
Bore & Stroke: 4.00 x 3.48 inches
Valvetrain: OHV, 2 valves per cyl.
Cylinder Head Material: Aluminum
Cylinder Block Deck Height: 9.025 Inches
Compression Ratio: 10.0:1
Horsepower: 245/250 HP @ 4,400 RPM
Torque: 350 lb-ft @ 3,200 rpm
Fuel Delivery: Multi-Port Fuel Injection
Fuel Capacity: 20.0 Gallons
Oil Capacity: 4.5 Quarts (Without Filter)
Total Dressed Engine Weight (Dry): 585.7lbs
Transmission: 4 Speed Auto Transmission (Standard), 6 Speed Manual Transmission (Optional)
Standard Axle Ratio: 2.59:1 (Automatic), 3.33:1 (Manual)

Engine (ZR-1)

Engine: LT5 5.7 OHV 350 V-8. Multi-Port Fuel Injection (COUPE)
Cylinders: V8
Block Material:
Aluminum*
Displacement: 5.7 Litre/350 Cubic Inches
Bore & Stroke: 3.90 x 3.66 inches
Valvetrain: OHV, 2 valves per cyl.
Cylinder Head Material: Aluminum
Cylinder Block Deck Height: 9.025 Inches
Compression Ratio: 11.0:1
Horsepower: 375 HP @ 6,000 RPM
Torque: 370 lb-ft @ 4,800 rpm
Fuel Delivery: Tuned-Port Fuel Injection
Fuel Capacity: 20.0 Gallons
Oil Capacity: 9.6 Quarts (Without Filter)
Total Dressed Engine Weight (Dry): 596.0 lbs
Transmission: 4 Speed Auto Transmission (Standard), 6 Speed Manual Transmission (Optional)
Standard Axle Ratio: 2.59:1 (Automatic), 3.33:1 (Manual)

*The engine crankcase, cylinder case, cylinder heads is aluminum with cast-in nodular cast iron bearing inserts.

Transmission

6 SPEED MANUAL GEAR RATIOS  4 SPEED AUTOMATIC GEAR RATIOS
1st GEAR: 2.68:1 1st GEAR: 3.06:1
2nd GEAR: 1.80:1 2nd GEAR: 1.63:1
3rd GEAR: 1.31:1 3rd GEAR: 1.00:1
4th GEAR: 1.00:1 4th GEAR: 0.70:1
5th GEAR: 0.75:1 REVERSE: 2.29:1
6th GEAR: 0.50:1
REVERSE: 2.50:1

1991 Corvette Wheels, Suspension & Brakes

Suspension (Coupe/Convertible)

Front Suspension Independent, unequal length upper and lower A-arms, transverse fiberglass leaf spring, tubular hydraulic shock absorbers, anti-roll bar.
Rear Suspension Independent, upper and lower trailing arms, lateral arms, tie rods, halfshafts, transverse fiberglass leaf springs, tubular hydraulic shock absorbers, anti-roll bar.

Suspension (ZR-1)

Front Suspension Single fiberglass composite monoleaf transverse spring with unequal-length aluminum control arms and stabilizer bar.
Rear Suspension Fully independent five-link system with transverse fiberglass single-leaf springs, aluminum upper/lower trailing links and strut-rod tie-rod assembly.

Wheels & Tires (Coupe/Convertible)

Front Tires Goodyear Eagle ZR, P275/40ZR-17
Rear Tires Goodyear Eagle ZR, P275/40ZR-17
Front Wheels 17 x 9.5 Inches, 5 Bolt Cast Alloy
Front Wheels 17 x 9.5 Inches, 5 Bolt Cast Alloy

Wheels & Tires (ZR-1)

Front Tires Goodyear Eagle ZR, P275/40ZR-17
Rear Tires Goodyear Eagle ZR, P315/35ZR-17 ZR-1
Front Wheels 17 x 9.5 Inches, 5 Bolt Cast Alloy
Front Wheels 17 x 11 Inches, 5 Bolt Cast Alloy

Brakes (Coupe/Convertible)

Type ABS Power-Assist Vented Brakes
Front Brakes 12.0 Inches
Rear Brakes 12.0 Inches

Brakes (Coupe/Convertible)

Type ABS Power-Assist Vented Brakes
Front Brakes 13.0 Inches (13.0 Inches – RPO Z51)
Rear Brakes 13.0 Inches (13.0 Inches – RPO Z51)

1991 Corvette Exterior Dimensions

Coupe Dimensions

1991 Corvette Dimensions

Exterior Dimensions

Exterior Dimensions
Model L98 Coupe L98 Convertible ZR-1 Coupe
Wheelbase 96.2 Inches 96.2 Inches 96.2 Inches
Overall Length 176.5 Inches 176.5 Inches 177.4 Inches
Total Body Width 71.0 Inches 71.0 Inches 74.0 Inches
Overall Height 46.7 Inches 46.7 Inches 46.8 Inches
Front Track Width 59.6 Inches 59.6 Inches 61.9 Inches
Rear Track Width 60.4 Inches 60.4 Inches 61.9 Inches

Interior Dimensions

Interior Dimensions
Model L98 Coupe L98 Convertible ZR-1 Coupe
Headroom 36.4 Inches 36.5 Inches 36.4 Inches
Shoulder Room 54.1 Inches 54.1 Inches 54.0 Inches
Hip Room 49.3 Inches 49.3 Inches 49.3 Inches
Leg Room 42.6 Inches 42.6 Inches 42.6 Inches

Capacities

Capacities
Model L98 Coupe L98 Convertible ZR-1 Coupe
Passenger Capacity 2 – Driver & Passenger 2 – Driver & Passenger 2 – Driver & Passenger
Curb Weight – Automatic (LBS) 3,294 3,294 3,470
Curb Weight – Manual (LBS) 3,330 3,336 3,465
Cargo Volume (CU.FT) 17.9 Cubic Feet 17.9 Cubic Feet 12.6 Cubic Feet
Fuel Capacity (GALLONS/LITERS) 20.0/76.0 20.0/76.0 20.0/76.0
Engine Oil Capacity (QTS./LITERS) 4.5 4.5 8.0
Coolant Capacity (QTS./LITERS) 14.6 14.6 14.6
Coefficient of Drag 0.33 N/A N/A
Weight Dist. Front/Rear (%) 50/50 50/50 50/50

1991 Corvette

1991 Corvette Performance Results

Model:
L98 Coupe
L98 Convertible
ZR-1 Coupe
Callaway
0-30 MPH:
N/A
N/A
2.1 Seconds
N/A
0-60 MPH:
5.3 Seconds
5.6 Seconds
4.9 Seconds
N/A
0-100 MPH:
N/A
N/A
11.2 Seconds
N/A
QUARTER MILE:
13.9 Seconds
14.1 Seconds
13.2 Sec/108mph
N/A
TOP SPEED (MPH):
N/A
N/A
171
192

1991 Corvette

1991 Corvette Vehicle Identification Numbers (VIN)

VIN Range 1G1YY2386M5100001 – 1G1YY2386M5118595 (Corvette Coupe & Convertible)
1G1YZ23J6M5800001 – 1G1YZ23J6M5802044 (ZR-1 Corvette)
1 (First Digit) 1 – United States
G (Second Digit) Manufacturer.  G – General Motors
1 (Third Digit) Manufacturer Division. 1 – Chevrolet
YY/YZ(ZR-1) Make of Car. YY – Corvette  Coupe/Convertible.  YZ – ZR-1 Corvette (Coupe Only)
2/3 (Sixth Digit) 2 – Two Door Hatchback Coupe, 3 – Two Door Convertible
3 (Seventh Digit) Type of Restraint System.  3 – Passive Restraint System.
8/J (ZR-1) Type of Engine. 8 – L98: 5.7 Liter, 350CI Engine with Tuned-Port Injection. J – LT5: 5.7 Liter, 350CI, 32 Valve Engine with Tuned-Port Injection
0/6 (ZR-1) Check Digit.
M (Tenth Digit) The Model Year. J – 1991
5 (Eleventh Digit) Location of the Assembly Plant. 5 – Bowling Green, Kentucky
1XXXXX (Twelfth thru Seventeenth Digits) Production Sequence Numbers.

The last six digits begin at 100001 and run thru 118595, accounting for each of the 18,595 Corvette Coupes/Convertibles built in 1991. Additionally, the last six digits of the ZR-1 VIN begin at 800001 and run thru 803049, accounting for each of the 2,044 ZR-1 Corvette Coupes built in 1991. Each Vehicle Identification Number (VIN) is unique to an individual car.

For all 1991 Corvettes, the Vehicle Identification Number was stamped on a plate on the inner vertical surface of the left windshield pillar visible through the windshield.

Check Digit is used to calculate the characters in the serial number and gives it a single digit code that can be used to verify the serial number is legitimate. (Note: The Check digit number varies depending on each specific VIN number.)

1991 Corvette Factory Options

CODE: DESCRIPTION: QUANTITY: RETAIL PRICE:
1YY07
Base Corvette Sport Coupe
14,967
$32,455.00
1YY67
Base Corvette Convertible
5,672
$38,770.00
AC1
Power Passenger Seat
17,267
$290.00
AC3
Power Driver Seat
19,937
$290.00
AQ9
Sport Seats, leather
10,650
$1,050.00
AR9
Base Seats, leather
9,505
$425.00
B2K
Callaway Twin Turbo (not GM installed)
71
$33,000.00
CC2
Auxillary Hardtop (convertible)
1,230
$1,995.00
C2L
Dual Removable Roof Panels (coupe)
5,031  $915.00
24S
Removable Roof Panel, blue tint (coupe)
 6,991
$615.00
 64S  Removable Roof Panel, bronze tint (coupe) 3,036
$615.00
C68
Electronic Air Conditioning Control
19,233
$180.00
FX3
Selective Ride and Handling, electronic
6,894
$1,695.00
G92
Performance Axle Ratio
3,453
$22.00
KC4
Engine Oil Cooler
7,525
$110.00
MN6
6-Speed Manual Transmission
5,875
$0.00
NN5
California Emission Requirements
3,050
$100.00
UJ6
Low Tire Pressure Warning Indicator
 5,175
$325.00
UU8
Stereo System, Delco-Bose
3,786
$823.00
U1F
Stereo System With CD, Delco-Bose
15,345  $1,219.00
 V56 Luggage Rack (convertible) 886
$140.00
 Z07 Adjustable Suspension Package (coupe) 733
$2,155.00
ZR1
Special Performance Package  (coupe)
2,044
$31,683.00

Base Corvette Sport Coupe (1YY07)

  • The base price of the 1991 Chevrolet Corvette Coupe without any optional equipment.
  • A 350 cubic inch, 245/250 horsepower engine, 4-speed automatic transmission, removable body-color roof panel, and cloth seats were included in the base price.
  • All 1991 Corvettes had restyled rear exteriors were similar in appearance to the 1991 ZR-1 Corvette because both had convex rear fascias with four rectangular tail lamps. All models also featured a new front end design with wrap around parking-cornering-fog lamps, new side panel louvers, and wider bodyside moldings in body color.
  • Base wheels were the same size as the 1990 Corvette (17×9.5) but were a new design.

Base Corvette Convertible (1YY67)

  • The base price of the 1991 Chevrolet Corvette Convertible without optional equipment.
  • All 1991 Corvettes had restyled rear exteriors were similar in appearance to the 1991 ZR-1 Corvette because both had convex rear fascias with four rectangular tail lamps. All models also featured a new front end design with wrap around parking-cornering-fog lamps, new side panel louvers, and wider bodyside moldings in body color.
  • Base wheels were the same size as the 1990 Corvette (17×9.5) but were a new design.

Base Seats, Leather (AR9)

  • Leather cover option for the standard, base driver and passenger seats.

Sports Seat, Leather (AQ9)

  • Special sport seats that featured inflatable lumbar support and power-adjusted side bolsters
  • This option was included as part of the ZR1 package.

Power Passenger Seat (AC1)

  • Optional, six-way, adjustable passenger seat.
  • This option was included as part of the ZR1 package.

Power Driver Seat (AC3)

  • Optional, six-way, adjustable driver seat.
  • This option was included as part of the ZR1 package.

Callaway Twin Turbo (not GM installed) (B2K)

  • Addition of Callaway Twin Turbos to the existing L98 engine.
  • The Callaway Twin-Turbo option ended with the 1991 model year. Callaway built the 500th twin-turbo on September 26, 1991 and subsequent builds were specially badged and optioned (for an $600.00) as “Callaway 500.”
  • This option generated a specific equipment build with standard engines at the Corvette assembly plant. The cars were then drop-shipped to Callaway’s Connecticut shop for installation of Callaway-modified twin-turbo engines.
  • This is not a factory installed option. The Callaway Corvette could be ordered through participating Chevrolet dealers. Fully assembled Corvettes were then shipped from the Bowling Green Corvette plant to Callaway Engineering in Old Lyme, Connecticut, where it received engine (and other) modifications.
    Full Chevrolet warranty applied except for powertrain which was covered by Callaway for twelve months or 12,000 miles.

Auxiliary Hardtop (convertible) (CC2)

  • An optional, removable hardtop.

Dual Removable Roof Panels (coupe) (C2L)

  • Included both a tinted, transparent glass top and a painted top.

Removable Roof Panels, blue tint (coupe) (24S)

  • Blue tinted removable glass top.

Removable Roof Panels, bronze tint (coupe) (64S)

  • Bronze tinted removable glass top.

Electronic Air Conditioning Control (C68)

  • Air conditioning system electronic control unit.

Selective Ride & Handling, Electronic (FX3)

  • Electronically controlled suspension with manual ride selection.
  • FX3 provided three variations of suspension control regulated by a console switch.
  • This option was included as part of the ZR1 package.

Performance Axle Ratio (G92)

  • Optional performance axle ratio of 3.07:1 or 3.33:1.
  • Was only offered when the Corvette was ordered with an automatic transmission.
  • The actual “Performance Axle Ratio” varied from year to year. The G92 Option was available when ordering either the Corvette or the Camaro throughout the 1980’s and early ’90’s.

Engine Oil Cooler (KC4)

  • Internal cooler used to cool internal components of the automobile’s internal combustion engine.

6-Speed Manual Transmission (MN6)

  • An optional, no-cost, 6-speed manual transmission.
  • The six-speed manual transmission was designed jointly by ZF (Zahnradfabrik Friedrichshafen) and Chevrolet and was initially built by ZF in Germany.
  • A computer-aided gear selection feature bypassed second and third gears (and locked out fifth and sixth) for improved fuel economy when a series of low performance criteria were met.

California Emission Requirements (NN5)

  • Revised emission/exhaust components to meet California Emission standards

Low Tire Pressure Warning Indicator (UJ6)

  • Low tire/air pressure monitoring and warning system.
  • Sensors strapped to each side of the inside of each wheel sent a radio signal to a instrument-panel receiver if pressure in any tire dropped below a preset limit.
  • This option was included as part of the ZR1 package.

Stereo System, Delco-Bose (UU8)

  • 200 watt Delco Bose AM/FM stereo radio with cassette.
  • A power delay feature was added to all models which permitted the stereo system and power windows to operate after the ignition was switched to “off” or “lock”. Power was cut after the driver’s door was opened or after 15 minutes, whichever came first.
  • The AM band for radios was expanded to receive more frequencies.

Stereo System with CD, Delco-Bose (U1F)

  • 200 watt Delco Bose AM/FM stereo radio with compact disc player.
  • This option was included as part of the ZR1 package.
  • To discourage theft, the CD player required an electronic security code input after battery disconnect.
  • A power delay feature was added to all models which permitted the stereo system and power windows to operate after the ignition was switched to “off” or “lock”. Power was cut after the driver’s door was opened or after 15 minutes, whichever came first.

Luggage Rack (convertible) (V56)

  • Optional luggage rack that was mounted to the rear decklid of the Corvette convertible.

Adjustable Suspension Package (coupe) (Z07)

  • Heavy Duty Suspension with Ride Control Selection.
  • New for 1991, the Z07 option effectively combined the previous Z51 performance handling package with FX3 selective ride/handling, but with minor differences. The new Z07 option used all heavy-duty suspension parts so the ride adjusted from firm to very firm.
  • Option Z07 included options KC4 (Engine Oil Cooler), FX3 (Selective Ride and Handling), heavy-duty springs, shocks, stabilizers and bushings, and heavy-duty brakes. Manual transmissions were specified, but build records report that 169 Corvettes that were equipped with the Z07 option were automatics.
  • Intended for aggressive driving or competition, the Z07 option was limited to coupes.

Special Performance Package (coupe) (ZR1)

  • Extensive performance upgrades to the base model Corvette.
    The ZR1 option included unique bodywork (doors, rear quarters, rocker panels, rear fascia, and rear upper panel.
  • ZR1 optioned Corvettes were fitted with special Goodyear Z-rated P315/35ZR17 tires that were mated to 11-inch wide rear rims.
  • The ZR1 option included a number of other RPO’s (normally listed separately) including: Power Passenger Seats (AC1), Power Driver Seats (AC3), Sports Seats, Leather (AQ9), Selective Ride and Handling, electronic ( FX3), Stereo System with CD, Delco Bose (U1F), and Low Tire Pressure Warning Indicators (UJ6) and a specially laminated “solar” windshield were included. Additionally, the six-speed manual transmission (MN6) was required.
  • The ZR1 was also fitted with a special LT5 engine (that was unique and limited to the ZR1 coupe.) The LT5 engine was designed with the same V-8 configuration and 4.4 inch bore spacing as the standard L98 engine, but was otherwise an all new Chevrolet/Lotus design with four overhead camshafts and 32 valves..
  • Despite extensive use of aluminum, the complexity of the LT5 engine caused it to weigh just under 40 pounds more than the base model iron-block engine.
  • The ZR-1 “valet” power access system continued, but was revised to default to normal power on each ignition cycle. The full power light was relocated next to the valet key.
  • Despite its similar appearance to the 1991 L98 Corvette, the ZR-1 still received unique doors and rear body panels to accept the 11-inch wide rear wheels. The high mount center stop lamp for the 1991 ZR-1s continued to be roof mounted.
  • The LT5 Engine produced 375 horsepower but still managed to avoid the EPA’s gas guzzler tax.
  • The LT5 Engines were assembled by Mercury Marine in Stillwater, Oklahoma, and were then shipped to the Corvette plant in Bowling Green Kentucky for ZR1 Corvette assembly.
  • Chevrolet service departments returned LT5 engines to Mercury Marine for certain repairs. Customers were given the choice of a replacement engine or return of their original engine, if repairable.
  • RPO K05 (Engine Block Heater) was not available when the ZR1 option was ordered.
  • The ZR1 option was only available in the coupe bodystyle.

Notes:

  • RPO K05 Engine Block Heater was available with base engines and was intended for Canada export only.
  • In 1991, 334 Engine Block Heaters were sold at $20.00 per car.
  • Mufflers were revised for the 1991 Corvette to feature larger section sizes and better control tuning of exhaust note. The mufflers had lower back pressure for improved performance, but power ratings were not changed.
  • While the 1991 ZR-1 Corvette continued to have a high mounted third stop light at the top of the rear window, the L98 Corvette coupe and convertible included a third taillight mounted in the rear fascia.
  • The World Challenge race series continued in 1991, but Bowling Green did not build specific Corvettes for the series. All race modifications were the responsibility of the car’s owner.
  • Finned power steering coolers were included with all 1991 models.
  • A power wire for cellular phones or other 12 volt devices was added.
  • A sensor utilizing an oil pan float was added to all models. The words “low oil” appeared in the driver information center for a low oil condition.

1991 Corvette

1991 Corvette Recalls

Recall 06e043000

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: Honeywell International, Inc.
Mfr’s Report Date: May 19, 2006
Nhtsa Campaign Id Number: 06e043000
Nhtsa Action Number: N/a
Component: Fuel System, Gasoline
Potential Number Of Units Affected: 88303

Summary

Certain Replacement Fuel Filters, Fram Brand Name P/n G3727, With Date Codes X52911 Through X60801 Sequentially Or X600141 And A Mexico Country Or Origin Marking On The Fuel Filter Housing Manufactured From October 18, 2005, Through March 21, 2006, Sold For Use On The Vehicles Listed Above And On Certain School Buses. (To See The School Bus Engine Sizes, Click On “Document Search” And Then “Bus Applications”). The Connector On The Fuel Filter Was Not Manufactured To Honeywell’s Specification. As A Result, The O-ring May Not Seat Correctly On The Fuel Line.

Consequence

This Condition May Cause An Inadequate Seal At The Connection, Potentially Leading To A Fuel Leak. In The Presence Of An Ignition Source, A Fire Could Occur.

Remedy

Honeywell Will Notify Owners And Replace The Fuel Filters Free Of Charge. The Recall Began On October 18, 2006. Owners May Contact Fram Customer Service At 1-800-890-2075 (Option 1).

Notes

This Recall Only Pertains To Aftermarket Fram Fuel Filters And Has No Relation To Any Original Equipment Installed On The Vehicles Listed. Customers May Contact The National Highway Traffic Safety Administration’s Vehicle Safety Hotline At 1-888-327-4236 (Tty: 1-800-424-9153); Or Go To Http://www.safercar.gov.

Recall 07e088000

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: Honeywell International, Inc.
Mfr’s Report Date: Oct 19, 2007
Nhtsa Campaign Id Number: 07e088000
Nhtsa Action Number: N/a
Component: Equipment
Potential Number Of Units Affected: 121680

Summary

Certain Honeywell Fram Racing Brand Hp4 And Hp8 Oil Filters That Were Manufactured From May 25, 2006, Through September 14, 2007, And Sold For Use As Replacement Equipment For Vehicles List Above. The Affected Filters Are Marked With A Date Code A61451 Through A72571 Sequentially. The Date Code And Part Number Appear On The Filter Housing. Fram Racing Hp4 And Hp8 Oil Filters Not Bearing A Date Code In This Range Are Not Affected By This Recall. The Gasket Of The Oil Filter Becomes More Pliable Under High Temperatures And Pressures.

Consequence

This Condition May Cause Inadequate Sealing And Loss Of Engine Oil, Possibly Resulting In A Fire.

Remedy

Honeywell Will Replace The Affected Oil Filters Free Of Charge. The Recall Began During November 2007. Owners Can Contact Fram Customer Service Toll-free At 1-800-890-2075.

Notes

Customers May Contact The National Highway Traffic Safety Administration’s Vehicle Safety Hotline At 1-888-327-4236 (Tty: 1-800-424-9153); Or Go To Http://www.safercar.gov.

Recall 90v008000

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: General Motors Corp.
Mfr’s Report Date: Jan 16, 1990
Nhtsa Campaign Id Number: 90v008000
Nhtsa Action Number: N/a
Component: Fuel System, Gasoline:delivery:hoses, Lines/piping, And Fittings
Potential Number Of Units Affected: 213

Summary

Fuel Feed And Return Line Connectors Have Incorrect Line End Flare Configurations.

Consequence

Line Ends Could Crack Causing A Fuel Leak That Could Result In An Engine Compartment Fire.

Remedy

Install New Fuel Lines With Correct End Flare Configuration.

Notes

System: Fuel Lines. Vehicle Description: Passenger Cars With Lt5 Engines.

Recall 91v143000 Ea90033

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: General Motors Corp.
Mfr’s Report Date: Aug 26, 1991
Nhtsa Campaign Id Number: 91v143000 Ea90033
Nhtsa Action Number: Ea90033
Component: Seat Belts:front:anchorage
Potential Number Of Units Affected: 231833

Summary

Under Certain Vehicle Operations And Occupant Usage Conditions, The Safety Belts Can Lockup Or Jam In The Safety Belt Retractor.

Consequence

If Lockup Occurs, It Is Impossible To Pull Belt Out Of The Retractor. The Occupant Of A Seat With An Unusable Safety Belt Is Subject To Increased Risk Of Injury Or Death In The Event Of A Sudden Stop Or Accident.

Remedy

Replace The Safety Belts If The Lockup Occurs.

Notes

System: Safety Belts.vehicle Description: Passenger Cars.


1991 Corvette Service Bulletins

Service Bulletin 020730024a

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: General Motors Corp.
Service Bulletin Number: 020730024a
Date Of Bulletin: Aug 01, 2005
Nhtsa Item Number: 634999

Component

Power Train: Automatic Transmission: Lever And Linkage: Column Shift

Summary

Diagnosis Of Cracked Or Broken Transmission Case. *tt 2006 And Prior Cars And Light Duty Trucks. *tt

Service Bulletin 020730024a

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: General Motors Corp.
Service Bulletin Number: 01697
Date Of Bulletin: Jan 01, 2004
Nhtsa Item Number: 10006297
Component: Equipment:electrical

Summary

No Serial Data Communications Using The Tech 1 With A 1986 Or Newer Camaro, Firebird Or Corvette With A 5.0 Or 5.7 Litre Engine. Sit Bulletin 1450640. *tt

Service Bulletin 010729004

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: General Motors Corp.
Service Bulletin Number: 010729004
Date Of Bulletin: Jun 01, 2001
Nhtsa Item Number: 622763

Component

Power Train:manual Transmission

Summary

Information Regarding Corvette Zf Six Speed Manual Transmission.

Service Bulletin 9313110

Make: Chevrolet
Model: Corvette
Model Year: 1991
Manufacturer: General Motors Corp
Service Bulletin Number: 9313110
Date Of Bulletin: Mar 01, 1993
Nhtsa Item Number: 39547
Component: Visibility:glass, Side/rear

Summary

Rear Lift Window Hard To Open/hinge Loose To Glass. *tw


1991 Corvette Common Issues

The following list of common issues is intended for individual reference only, and may not reflect the specific issues of every 1991 Corvette. This information comes from a variety of sources including the NHTSA Defects Reports pages. While the intent of this page is to identify the common issues pertaining to the 1991 Corvette, it is not an all-inclusive list and should be used for reference only.

Mechanical Issues

Engine

The throttle linkage is known to stick, causing the throttle body to remain open. This creates a potentially serious issue in that it can cause the car to accelerate uncontrollably at ignition, resulting in damage to vehicle and possible driver/passenger injury.

The intake manifold gaskets are prone to developing leaks.

The 1991 L98 Engine is known to have overheating issues.

Intermittent stall issues have been frequently reported.

Air Conditioning

The air conditioning compressor on the 1991 Corvette has a high tendency to fail prematurely.

Alternator/Generator

The alternator on the 1991 Corvette is prone to premature failure, resulting in frequent replacement of the unit. Several instances have been reported of the alternator failing even after recent replacement, causing the vehicle to fail during normal operation.

Braking System

Anti-lock brake system warning light illuminates on dashboard, indicating possible malfunction of the ABS system. The ABS system on the 1991 Corvette has been well documented as having intermittent operation problems. In some instances, the brake pedal faded after the ABS light came on, resulting in inoperable brakes during stopping condition.

The brakes on the 1991 Corvette may lock up during normal driving conditions.

Electrical Issues

Electronic Control Unit (ECU)

The electronic control unit (ECU) is prone to failure, causing vehicle to stall during operation. Failure of the ECU can also prevent the Corvette from starting.

Exterior Issues

Windshield Wiper System

The windshield wipers periodically skip across the windshield, which causes them to get out of sync with each other. Additionally, the wiper assembly is prone to lock up during normal usage and requires replacement of entire assembly.

Interior Issues

Passive Restraint System

During activation in an impact situation, the airbags either failed to deploy completely, or they partially deployed without fully inflating.

Driver & Passenger Seats

Drivers seat is known to become loose on track. Seat tracks not securely mounted to floorpan/frame assembly, creating possible hazardous driving conditions. Always inspect the driver and passenger seats before operating vehicle.

Seat Belts & Safety Restraints

In some instances, the shoulder harness of the driver’s seat belt has failed to restrain driver during crash condition, causing driver to sustain injury against steering wheel/dashboard. Seat belts were recalled by dealership.

Other symptoms of seat belt failure include: the driver’s side seat belt locks up completely, making it completely inoperable and unusable. The lap belt also locks up during use, causing the belt to successively tighten when vehicle experiences even normal bumps/imperfections on the road.

1991 Corvette

1991 Corvette Maintenance Schedule

Maintenance Schedule

Schedule 1

Follow Schedule 1 if your car is mainly operated under one or more of the following conditions:.

  • When most trips are less than 4 miles (6 kilometers)
  • When most trips are less than 10 miles (16 kilometers) when outside temperatures are below freezing.
  • When the engine is at low speed most of the time (as in stop-and-go traffic).
  • When operating in dusty areas.
1991 Corvette Maintenance Schedule
1991 Corvette Maintenance Schedule

Schedule 2

Follow Schedule 2 only if none of the driving conditions specified in Schedule 1 apply.

1991 Corvette Maintenance Schedule
1991 Corvette Maintenance Schedule

Maintenance Information

The 1991 Corvette has an Engine Oil Life Monitor. This monitor will show drivers when to change their oil – usually between 3,000 miles (5,000 km) and 7,500 miles (12,500 km) since the last oil change.  Under severe conditions the indicator may come on before 3,000 miles (5,000 km).  Never drive your vehicle more than 7,500 miles (12,500 km) or 12 months whichever occurs first, without an oil change.

The system won’t detect dust in the oil.  If you drive in a dusty area be sure to change your oil every 3,000 miles (5,000 km) or sooner if the CHANGE OIL light comes on.  Remember to reset the Oil Life Monitor when the oil has been changed.  See “GM Oil Life System” (at the bottom of this page) for more information on resetting the system.

Explanation of Scheduled Maintenance Services:

Engine Oil and Filter Change: Use only API Service SG Energy Conserving II oils of the proper viscosity.*  The engine requires a special oil meeting GM Standard GM4718M.  Oils meeting this Standard may be identified as synthetic, and should also be identified as API Service SG.  However, not all Synthetic API Service SG oils will meet this GM Standard.  You should look for and use only an oil that meets GM Standard GM4718M.

Chassis Lubrication: Lubricate the transmission shift linkage, parking brake cable guides, underbody contact points and linkage. Lubricate the front suspension.

Engine Accessory Drive Belt Inspection: Inspect the belts for cracks, fraying, wear and proper tension.  Replace as needed.

Cooling System Service: Drain, flush and refill the system with new or approved recycled coolant conforming to GM Specification 1825M.  Keep coolant at the proper mixture as specified.  This provides proper freeze protection, corrosion inhibitor level and engine operating temperature.

Inspect hoses and replace if they are cracked, swollen or deteriorated.  Tighten screw-type hose clamps. Clean the outside of the radiator and air conditioning condenser.  Wash the pressure cap and neck.

To help ensure proper operation, we recommend a pressure test of both the cooling system and the pressure cap.

Transmission Service: For manual transmissions, the fluid doesn’t require changing.

For automatic transmissions, change both the fluid and filter every 15,000 miles (25,000 kilometers) if the vehicle is mainly driven under one or more of these conditions: heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher, in hilly or mountainous terrain. Uses such as found in taxi, police or delivery service.  If you do not use your vehicle under any of these conditions, change the fluid and filter at 100,000 miles (166,000 kilometers).

Spark Plug Replacement: Replace spark plugs with the proper type.

Spark Plug Wire Inspection: Inspect for burns, cracks or other damage.  Check the boot fit at the coils and at the spark plugs.  Replace the wires as needed.

Air Cleaner Filter Replacement: Replace every 30,000 miles (50,000 kilometers) or more often under dusty conditions.  Ask your local dealership for proper intervals based on individual driving conditions.

Fuel Tank, Cap and Line Inspection: Inspect the fuel tank, cap, and lines (including fuel rails and injection assembly) for damage and leaks.

Inspect fuel cap gasket for an even filler neck imprint or any damage.  Replace parts as needed.  Periodic replacement of the fuel filter is not required.

Owner Inspection & Service Items

At Each Fuel Fill

It is important for you or a service station attendant to perform these underhood checks at each fuel fill.

Engine Oil Level Check: Check the engine oil level and add the proper oil if necessary. If you have a ZR-1 you should check your engine oil when the engine is cold.

Engine Coolant Level Check: Check the engine coolant level and add the proper coolant mixture if necessary.

Windshield Washer Fluid Level Check: Check the windshield washer fluid level in the windshield washer tank and add the proper fluid if necessary.

At Least Once a Month

Tire Inflation Check: Make sure tires are inflated to the correct pressures specified on the Tire-Loading Information Label located on the rear edge of the driver door.

At Least Once A Year

Key Lock Cylinder Service: Lubricate the key lock cylinders.

Body Lubrication Service: Lubricate all body door hinges. Also lubricate all hinges and latches, including those for the hood, rear compartment, console door and any folding seat hardware.  More frequent lubrication may be required when exposed to a corrosive environment.

Starter Switch Check: CAUTION: When you are doing this check, the vehicle could move suddenly.  If it does, you or others could be injured. Before you start, be sure you have enough room around the vehicle.
Firmly apply the parking brake and the regular brake.  (NOTE: Do not use the accelerator pedal, and be ready to turn off the engine immediately  if it starts.)

On automatic transmission vehicles, try to start the engine in each gear. The starter should work only in PARK (P) or NEUTRAL (N). If the starter works in any other position, your vehicle needs service.
On manual transmission vehicles, put the shift lever in NEUTRAL (N), push the clutch down halfway and try to start the engine. The starter should work only when the clutch is pushed down all the way to the floor.  If the starter works when the clutch isn’t pushed all the way down, your vehicle needs service.

Steering Column Lock Check: While parked, and with the parking brake set, try to turn the ignition key to OFF in each shift lever position.

With an automatic transmission, the key should turn to LOCK only when the shift lever is in PARK (P). With a manual transmission, the key should turn to LOCK only when the shift lever is in REVERSE (R). On all vehicles, the key should come out only in LOCK.

Parking Brake and Automatic Transmission PARK (P) Mechanism Check: CAUTION: When you are doing this check, your vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of your vehicle in case it begins to roll. Be ready to apply the regular brake at once should the vehicle begin to move.

Park on a fairly steep hill, with the vehicle facing downhill.  Keeping your foot on the regular brake, set the parking brake.

To check the parking brake’s holding ability: With the engine running and transmission in NEUTRAL (N), slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held by the parking brake only.

To check the PARK (P) mechanism’s holding ability: With the engine running, shift to PARK (P). Then release the parking brake followed by the regular brake.

Underbody Flushing Service: At least every spring, use plain water to flush any corrosive materials from the underbody. Take care to clean thoroughly any areas where mud and other debris can collect.

Dealership Inspection & Service Items

At Least Twice A Year

Steering and Suspension Inspection: Inspect the front and rear suspension and steering system for damaged, loose or missing parts, signs of wear or lack of lubrication. Inspect the power steering lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc.

Tire and Wheel Inspection: Inspect the tires for uneven wear or damage. If there is irregular or premature wear, check the wheel alignment.  Inspect for damaged wheels.

Exhaust System Inspection: Inspect the complete exhaust system. Inspect the body near the exhaust system. Look for broken, damaged, missing or out-of-position parts as well as open seams, holes, loose connections or other conditions which could cause a heat build-up in the floor pan or could let exhaust fumes into the vehicle.

Rear Axle Service: Check the gear lubricant level in the rear axle and add if needed.  A fluid loss may indicate a problem. Check the axle and repair it if needed.

Brake System Inspection: Inspect the complete system. Inspect brake lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Inspect disc brake pads for wear and rotors for surface condition. Inspect other brake parts, including calipers, parking brake, etc.  You may need to have your brakes inspected more often if your driving habits or conditions result in frequent braking.

NOTE: A low brake fluid level can indicate worn disc brake pads which may need to be serviced.  Also if the brake light stays on or comes on, something may be wrong with the brake system.  If your anti-lock brake system warning light stays on, come on or flashes, something may be wrong with the anti-lock braking system.

GM Oil Life System: Your vehicle has a computer that lets you know when to change your engine oil. This is not based on mileage, but on engine revolutions and engine operating temperature. When the computer has calculated that the oil needs changing, the GM Oil Life System will indicate that a change is necessary.

The mileage between oil changes will vary depending on how you drive your vehicle — usually between 3,000 miles (5 000 km) and 10,000 miles (16 000 km) since your last oil and filter change. Under severe conditions, the system may come on before 3,000 miles (5 000 km). Never drive your vehicle more than 10,000 miles (16 000 km) or 12 months (whichever occurs first) without an oil change. Use engine oil meeting the GM Standard GM4718M.

The system won’t detect dust in the oil. So, if you drive in a dusty area, be sure to change your oil and filter every 3,000 miles (5 000 km) or sooner if the CHANGE OIL SOON message appears. Remember to reset the system whenever the oil is changed.

How to Reset the Change Oil Soon Message
To reset the CHANGE OIL SOON message after an oil change, do the following:
1. Turn the ignition to ON and with the engine off.
2. Press the TRIP button so the OIL LIFE percentage is displayed.
3. Press RESET and hold for two seconds. OIL LIFE REMAIN 100% will appear.

1991 Corvette DIY Service Guide

Battery & Charging

Inspection & Replacement of Battery, Factory Battery Specifications, Replacement of Alternator/Generator

Belts & Hoses

How to Replace Drive Belt(s), Inspection & Replacement of Upper/Lower Radiator Hoses

Braking

Inspection & Replacement of Brake Pads, Inspection & Replacement of Front/Rear Brake Rotors, How to Replace Brake Calipers, How to Bleed Brakes, Inspection & Replacement of Master Cylinder

Heating & Cooling

Inspection & Replacement of Radiator, How to Replace the Heater Core, Inspection & Replacement of Upper/Lower Radiator Hoses, How to Flush the Cooling System, How to Replace the Water Pump, How to Replace a Thermostat.

Emissions

Location of, Inspection & Replacement of Oxygen Sensors (Upstream/Downstream), How to Replace the EGR Valve, How to Replace the Smog Pump.

Filters/PCV Valves

Location & Replacement of the Following Filters: Oil Filter, Fuel Filter, Transmission Filter, PCV Valve.

Ignition & Tune Up

How to Replace the Ignition Coil, How to Replace the Ignition Switch, Inspection & Replacement of Sparkplug Wires, Inspection & Replacement of Cap & Rotor, How to Replace Sparkplugs, Engine Firing Order, Engine Timing.

Relays & Sensors

Location & Replacement of: Mass Air Flow Sensor, Oil Pressure Sensor, Engine Temperature Sensor, Ambient Air Temperature Sensor, Fuel Pressure Sensor, Oxygen Sensors (Upstream/Downstream).

Suspension & Steering

Inspection & Replacement of Upper/Lower Ball Joints, How to Replace Control Arm Bushings, How to Replace the Power Steering Pump, Inspection & Replacement of Front Shocks/Struts, Inspection & Replacement of Rear Shocks/Struts, How to Replace Inner & Outer Tie Rod Ends.

Starter/External Engine

How to Replace the Starter Motor, How to Replace the Starter Solenoid, How to Replace the Drive Belt Tensioner, How to Replace the Idler Pulley, Location of, Inspection & Replacement of Engine (Motor) Mounts, How to Replace the Oil Pan Gasket, How to Replace the Oil Pump.

Transmission & Clutches

How to Change the Transmission Filter (Automatic Transmission), How to Replace a Clutch (Manual Transmission).

1991 Corvette Dealers Sales Brochure

1991 Corvette Dealers Sales Brochure

Download this 1991 Corvette Dealers Sales Brochure for a quick look at the features of the car.

Download 1991 Corvette Dealers Sales Brochure

Source Material:

  1. The Pocket Book of the Corvette: The Definitive Guide to the All American Sports Car – Copyright 2003, Barnes & Noble
  2. CORVETTE: Sports Car Superstar – Copyright 2005, PIL – Publications International, Ltd.
  3. Corvette Black Book – Copyright 2009, Michael Bruce Associates, Inc.
  4. The Complete Book of Corvette, Every Model Since 1953 – Copyright 2005, Mike Mueller – MBI Publishing

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