service CHEVROLET CORVETTE 1994 4.G Repair Manual

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on a specified government test course. For
example, a tire graded 150 would wear
one and a half
(1 1/2) times as well on the
government course as a tire graded
100.
The relative performance of tires depends
upon the actual conditions of their use,
however, and may depart significantly
from the norm due to variations in driving
habits, service practices and differences in
road characteristics and climate.
Traction - A, B, C
The traction grades, from highest to
iowest are:
A, B, and C. They represent
the tire’s ability to stop on wet pavement
as measured under controlled conditions
on specified government test surfaces of
asphalt and concrete.
A tire marked C
may have poor traction performance.
Warning: The traction grade assigned
to this tire is based on braking
(straight-ahead) traction tests and does
not include cornering (turning) traction.
Temperature - A, B, C
The temperature grades are A (the
highest),
B, and C, representing the tire’s
resistance to the generation of heat and its
ability to dissipate heat when tested under
controlled conditions on a specified
. . .208
indoor laboratory test wheel. Sustained
high temperature can cause the material
of the tire to degenerate and reduce tire
life, and excessive temperature can lead to
sudden tire failure. The grade C
corresponds to a level
of performance
which all passenger car tires must meet
under the Federal Motor Vehicle Safety
Standard
No. 109. Grades B and A
represent higher levels of performance on
the laboratory test wheel than the
minimum required by law.
Warning: The temperature grade for
this tire is established for a tire that is
properly inflated and not overloaded.
Excessive speed, underinflation, or
excessive loading, either separately or
in combination, can cause heat buiidup
and possible tire failure.
These grades are molded on the sidewalls
of passenger car tires.
While the tires available as standard or
optional equipment on General Motors
vehicles may vary with respect to these
grades, all such tires meet General Motors
performance standards and have been
approved for use on General Motors
vehicles. All passenger type
(P Metric)
tires must conform to Federal safety
requirements in addition to these grades.
Wheel Alignment and Tire Balance
The wheels on your vehicle were aligned
and balanced carefully at the factory to
give you the longest tire life and best
overall performance.
In most cases, you will not need to have
your wheels aligned again. However, if
you notice unusual tire wear or your
vehicle pulling one way or
the other, the
alignment may need to be reset. If you
notice your vehicle vibrating when
driving on a smooth road, your wheels may need to be rebalanced.
Wheel- Replacement - . -
Replace any wheel that is bent, cracked or
badly rusted. If wheel nuts keep coming
loose, the wheel, wheel bolts, and wheel
nuts should be replaced. If the wheel
leaks air, replace it (except some
aluminum wheels, which can sometimes
be repaired). See your Chevrolet dealer
if any of these conditions exist.
Your dealer will know the kind of wheel
you need.
Each new wheel should have the same
load carrying capacity, diameter, width,
offset, and be mounted
the same way as
the one it replaces.

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Appearance Care
Remember, cleaning products can be
hazardous. Some are toxic. Others can
burst into flame if you strike a match
or get them on a hot part of the vehicle.
Some are dangerous if you breathe
their fumes in a closed space. When
you use anything from a container to
clean your Corvette, be sure to follow
the manufacturer’s warnings and
instructions. And always open your
doors or windows
when you’re
cleaning the inside. Never use
these to clean your vehicle:
0 Gasoline
Benzene
0 Naphtha
0 Carbon Tetrachloride
Acetone
0 Paint Thinner
0 Turpentine
Lacquer Thinner
0 Nail Polish Remover
They can all be hazardous
- some more
than others
- and they can all damage
your vehicle, too. Don’t use any
of these unless this manual
says you can. In many uses, these will
damage your vehicle:
0 Alcohol
0 Laundry Soap
0 Bleach
Reducing Agents
Cleaning the Inside of Your
Corvette
Use a vacuum cleaner often to get rid of
dust and loose dirt. Wipe vinyl or leather
with a clean, damp cloth.
Your Chevrolet dealer has two
GM
cleaners, a solvent-type spot lifter and a
foam-type powdered cleaner. They will
clean normal spots and stains very well.
Do not use them on vinyl or leather.
Here are some cleaning tips: Always read the instructions on the
cleaner label. Clean up stains as soon as you can
-
before they set.
Use a clean cloth or sponge, and
change to a clean area often. A soft
brush may be used
if stains are
stubborn.
I
. . .210

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Non-greasy stains: Such as catsup,
coffee (black), egg, fruit, fruit juice, milk,
soft drinks, wine, vomit, urine and blood.
Carefully scrape off excess stain, then
sponge the soiled area with cool water.
0 If a stain remains, follow the
foam-type instructions described
earlier.
0 If an odor lingers after cleaning
vomit or urine, treat the area
with
a waterbaking soda solution:
1 teaspoon (5 ml) of baking soda to
1 cup (250 ml) of lukewarm water.
solvent-type cleaner.
0 If needed, clean lightly with
Combination stains: Such as candy,
ice cream, mayonnaise, chili sauce and
unknown stains.
0 Carefully scrape off excess stain, then
clean with cool water and allow to dry.
0 If a stain remains, clean it with
solvent-type cleaner.
Cleaning Vinyl
Use warm water and a clean cloth.
0 Rub with a clean, damp cloth to
remove dirt.
You may have to do it
more than once.
. . .212
0 Things like tar, asphalt and shoe
polish will stain if you don’t get them
off quickly. Use a clean cloth and
solvent-type vinyl cleaner.
Cleaning Leather
Use a soft cloth with lukewarm water and
a mild soap or saddle soap.
For stubborn stains, use a mild
solution of
10% isopropyl alcohol
(rubbing alchohol) and
90% water.
Never use oils, varnishes,
solvent-based or abrasive cleaners,
furniture polish or shoe polish on
leather.
Soiled leather should be cleaned
immediately. If dirt is allowed to work
into finish, it can harm the leather.
Cleaning Soft-Touch Surfaces
Use only mild soap and water to clean the
Soft-Touch paint surfaces in your
Corvette. For protection, use ArmorAll8
or equivalent.
Cleaning the Top of the Instrument
Panel
Use only mild soap and water to clean the
top surfaces of the instrument panel. Sprays containing silicones or waxes
may
cause annoying reflections in the
windshield and even make it difficult to
see through the windshield under certain conditions.
Cleaning Speaker Covers
Vacuum around a speaker cover gently,
so that the speaker won’t be damaged. If
something gets on one of them, follow the
steps under “Using Solvent-Type Cleaner
on Fabric.” Use as little solvent as you
can.
Care of Safety Belts
Keep belts clean and dry.

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Cleaning the Outside of Your
Corvette
The paint finish on your vehicle provides
beauty, depth of color, gloss retention and
durability.
Washing Your Vehicle
The best way to preserve your vehicle’s
finish is to keep it clean by washing it
often with lukewarm or cold water.
Don’t wash your vehicle in the direct rays
of the
sun. Don’t use strong soaps or
chemical detergents. Use liquid hand,
dish or car washing (mild detergent)
soaps. Don’t use cleaning agents that
are petroleum-based, or contain acid or
abrasives. All cleaning agents should be
flushed promptly and not allowed to dry
on
the surface, or they could stain. Dry
the finish with a soft, clean chamois or a
100% cotton towel to avoid surface
scratches and water spotting.
High pressure car washes may cause
water to enter your vehicle.
. . .214
NOTICE:
Conveyor systems on some
automatic car washes may damage a
Corvette. They may not have enough
clearance for the undercarriage or for
the extra wide rear tires on ZR-1
models. Check with the manager
before using a car wash.
Finish Care
3ccasional waxing or mild polishing of
your Corvette may be necessary to
-emove residue from the paint finish.
You
:an get GM approved cleaning products
?ram your dealer. (See “Appearance Care
ind Materials” in the Index.)
Your Corvette has a “basecoat/clearcoat”
Jaint finish. The clearcoat gives more
lepth and gloss to
the colored basecoat.
4lways use waxes and polishes that are
lon-abrasive and made for a
>asecoat/clearcoat paint finish.
NOTICE:
Machine compounding or aggressive
polishing on a basecoat/clearcoat
paint finish may dull the finish or
leave swirl
marks,
Cleaning Your Convertible Top
Your convertible top should be cleaned
often. If you use an automatic car wash,
use one with water jets and hanging
cloths.
When you hand wash the top, do it in
partial shade. Vacuum away any dust and
other material. Use a mild soap,
lukewarm water and a soft sponge.
A
chamois or cloth may leave lint on the
top, and a brush can chafe the threads in
the top fabric. Don’t use detergents, harsh
cleaners, solvents or bleaching agents.
When you clean
the top, put one hand
under it to support
it. Wet the entire
vehicle and wash the top evenly to avoid
spots or rings. Let the soap remain on the
fabric for a few minutes. When the top is
really dirty, use a mild foam-type cleaner.
Thoroughly rinse the entire vehicle,
then
let the top dry in direct sunlight.

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Finish Damage
Any stone chips, fractures or deep
scratches
in the finish should be repaired
right away.
Minor chips and scratches can be repaired
with touch-up materials available from
your dealer or other service outlets.
Larger areas of finish damage can be
corrected
in your dealer’s body and
paint shop.
Underbody Maintenance
Chemicals used for ice and snow removal
and dust control can collect on the
underbody. If these are not removed,
accelerated corrosion (rust) can occur on
the underbody parts such as fuel lines,
frame, floor pan, and exhaust system even
though they have corrosion protection.
At least every spring, flush these
materials from
the underbody with plain
water. Clean any areas where mud and
other debris can collect. Dirt packed in
closed areas of the frame should be
loosened before being flushed. Your
dealer or an underbody vehicle washing
system can do this for you.
. . .216
Fiberglass Springs
I NOTICE:
Don’t use corrosive or acidic
cleaning agents, engine degreasers,
aluminum cleaning agents or other
harsh solvents to clean fiberglass
springs; they’ll damage the springs.
Chemical Paint Spotting
Some weather and atmospheric conditions
can create a chemical fallout. Airborne
pollutants can fall upon and attack
painted surfaces on your vehicle. This damage can take two
forms: blotchy,
ringlet-shaped discolorations, and small
irregular dark spots etched into the paint
surface.
Although no defect in the paint job causes
this, Chevrolet will repair, at no charge to
the owner,
the surfaces of new vehicles
damaged by this fallout condition within
12 months or 12,000 miles (20 000 km)
Df purchase, whichever comes first.

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I Vehicle Identification
Number (VIN)
:his is the legal identifier for your
lorvette. It appears on a plate in the front
orner of the instrument panel, on the
.river’s side. You can see it if you look
hrough the windshield from outside your
.chicle. The VIN also appears on the
rehicle Certification and Service Parts
abels and the certificates of title and
,egistration.
hgine Identification
The eighth character in your VIN is the
mgine code. This code will help you
dentify your engine, specifications, and
meplacement parts.
. .218
Service Parts
Identification Label
You’ll find this label on the underside of
your console storage compartment. It’s
very helpful if you ever need to order
parts. On this label is:
0 your VIN,
.* the model designation,
paint information, and
a list of all production options and
special equipment.
Be sure that this label is not removed
from the vehicle.
Add-on Electrical
Equipment
NOTICE:
Don’t add anything electrical to
your Corvette unless you check with
your dealer first. Some electrical
equipment can damage your vehicle
and the damage wouldn’t be covered
by your warranty. Some add-on
electrical equipment can keep other
components from working as they should.
Your vehicle has an air bag system.
Before attempting to add anything
electrical to your Corvette, see “Servicing
Your Air Bag-Equipped Corvette” in the
Index.

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I EoA7 I
POWER WINDOW
lu
D
.
Instrument Panel Fuse Block
1 - A/C Module (5 Amp)
2 - Blank
3 - Windshield WiperNVasher Switch
4 - Radio Receiver Box (Ignition)
5 - Heated Mirrors (5 Amp.)
6 - Taillight, Daytime Running Lights
Module (15 Amp.)
Assembly
(30 Amp.)
(5 Amp.)
7 - Horn Relay
(15 Amp.)
*Export Horn
(20 Amp.)
8 - Hazard Flashers; Brake Switch
(20 Amp.)
9 - Crank-Air Bag (5 Amp.)
10 - Crank-Parmeutral Shitch
(Automatic); Clutch (Manual)
(5 Amp.)
11 - RH Illumination (5 Amp.)
12 - LH Illumination (5 Amp.)
13 - Console Illumination (5 Amp.)
14 - Fuel Pump 1 (10 Amp.)
15 - Fuel Pump 2 (LT5) (IO Amp.)
16 - Central Control Module; Daytime
Running Lights Module
(5 Amp.)
17 - Generator; Vacuum Pump (LT5);
Valet Mode (LT5); EGR Circuit
(LT5); Oxygen Sensors (LT5)
(10 Amp.)
and A/C Control Head; Heater and
A/C Programmer; Rear Defog
Relay
(10 Amp.)
19 - Utility Plug (15 Amp.)
20 - Heated Oxygen Sensors (LT1)
(15 Amp.)
21 - Fuel Pump Relay Coil #2 (LT5);
Selective Ride Control Module;
ABS Module; Transmission Clutch
Control Switch (Automatic);
Air Pump Relay; Diverter Valve;
Secondary Bypass Valve (LT5)
(10 Amp.)
22 - Injectors #1,4,6,7 (LT1); Primary
Injectors #1-8 (LT5); Ignition Coil
Module (LT5); Ignition Coil Plate
Connector (LT5) (10 Amp.)
18 - A/C Compressor Clutch; Heater
. . .220

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. . .222
1 I INTERIOR LIGHTING
20A I
I RH HDLP 30A I I I
h 3 5 I SECONDARY COOLING FAN
40A I
6 I EXTERIOR LIGHTING
60A
I
7 piiiFiAAccsy
I
AIR PUMP
20A I
Forward Lamp Fuse Block
1 - Interior Lighting (20 Amp.)
2 - Primary Cooling Fan (30 Amp.)
3 - LH Headlight Motor (30 Amp.)
4 - RH Headlight Motor (30 Amp.)
5 - Secondary Cooling Fan (40 Amp.)
6 - Exterior Lighting (60 Amp.)
7
- Power Accessory (Power Locks, Hatch, Lighter, Seats)
(60 Amp.)
8 - Air Pump (20 Amp.)
ECM Engine Fuse Block.
1 - Engine Control Module (20 Amp.)
2 - Fuel Pump (20 Amp.)
3 - Anti-lock Brakes; Acceleration Slip
Regulation System
(20 Amp.)
4 - A/C Blower (30 Amp.)
5 - Rear Defogger (40 Amp.)
6 - Ignition (60 Amp.)
7 - Ignition (60 Amp.)
8 - Brake Hydraulics (40 Amp.)
FUEL PUMP
ABS/ASR ECU
A/C BLOWER
IGNITION WA I
8 I BRAKE HYDRAULICS 4OA I

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Air Conditioningmeater Control ....................................... 37
Automatic Transmission Indicator
.................................. 194NA
Backup
......................................................... 1 156
Center High-Mounted Stoplight (except ZR-1)
.......................... 1156
Center High-Mounted Stoplight (ZR-
1) ................................. 891
Console
......................................................... 564
Cornering
....................................................... 1156
DoorCourtesy
.................................................. 212-2
Door Flood
........................................................ 73
Driver Information Center
Floorcourtesy
.................................................... 562
Fog
.............................................................. 896
* .............................................
Front Parking/Turn Signal ....................................... 2057NA
Headlight
..................................................... HP6054
Instrument Cluster
License
........................................................... 24
MirrorFlood
....................................................... 74
MirrorReading
.................................................... 168
Radio
* ...................................................
* .............................................................
Rear Courtesy (Convertible) ......................................... 562
Rear Courtesy (except Convertible)
.................................... 906
Sidemarker
........................................................ 24
Tail/Stop/Turn
................................................... 2057
Underhood
..................................................... 212-2
Visor Vanity Mirror
................................................. 74
"These bulbs are not owner.serviceab1e . See your dealer .
. h . .
223 ...

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Capacities and Specifications
Engine
Type ............................................................. V8
Fuel Delivery
....................... Sequential Multiport Fuel Injection (SFI)
Valve Arrangement VIN Engine Code
J ................................. Dual Overhead Cam
VIN Engine Code
P .................................... Overhead Valve
Piston Displacement ....................................... 350 CID (5.7L)
Bore
VIN Engine Code
J ..................................... 3.90" (99 mm)
VIN Engine Code P .................................. .4.00" (101.6 mm)
VIN Engine Code
J ..................................... 3.66" (93 mm)
VIN Engine Code
P .................................. .3.48" (88.39 mm)
VIN Engine Code
J ............................................ 11 .O: 1
VIN Engine Code
P ............................................ 10.5: 1
Firingorder .......................................... 1-843-6-5-7-2
Stroke
Compression Ratio
.. .224