CHEVROLET CORVETTE 1993 4.G Owners Manual

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Service
Your Chevrolet dealer knows your
vehicle best -and-
wank you to be happy
with it. We hope you’ll go to your dealer
€or all your service needs.
You’ll get
genuine CM parts and GM-trained and
supported sewice people.
we hope you’ll want to lceepyour GM
vehicle all GM. Genuine GM parts have
one-of these marks.
240
Doing Your Own Service Work
If you want to do- some of your own
service work, yau’ll want to get the
proper Corvette -Service Manual. It tells.
you.much more about
how to service
your Corvette than this manual can. To
order the proper service manual, see the
Index.under
Service Publications.
You should keep a record with all parts
receipts and list the mileage and the
date of any service work you perform.
See the
Index under Maintenance
Record.
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F I
Fael
Use premium ,unleadedgasohe rated at
91 octane higher, You may use
middle grade or rcgultir unleaded
gasolines, but-
your vehicle may not
accelerate as
well. The gasoline you use
should meet specifications ASTM
D4814 inthe US. and CGSB 3-5-92 in
Canada. These fuels should have the
proper additives, so you should not
have
to add- mything’to the fuel.
In the US. and Canada, it’s easy to be
sure. you get the right lrind of gasoline
(unleaded). You’ll
see “UNLEADED”
right QII the pump. And-only unleaded
nozzles
will fit into your vehicle’s filler
neck.
Be sure the posted-octane for premium
is at least 91 (at leatit 89 €or middle-
grade and 87 for regular). If the octane
is less than 87, yuu may get a heavy
knocking nu& when you drive. I€. it’s
bad enough, it
can damage YOLK engine.
If you’re usingfuel rated at 91 octane or
higher and you still hear heavy
knocking, your engine needs service.
But don’t wq if you hear a little
pinging noise
when you’re accelerating
or driving up
a hill. That’s normal and
you don’t have to buy a higher .octane
fuel to get rid of pinging. It’s the heavy,
constant
knock that means you have a
problem.
Fuel Capacity: 20 U. S. Gallons
(75.7 L) . Use unleaded he1 only.
24 I ...

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Fuel (CONT.)
What about gasoline with .blending
materialsthat contain oxygen, such as
MTBE or alcohol?
4 MTBE is ‘‘m&hYl tefiiary-butyl
ether,” Fuel that -is. no more than 15%
MTBE is fine %or your vehicle..
Ethanol is .ethyl or -grain alcohol.
.Prop,erly-bknded he1 that is no more
than 10% ethanol is fine €or your
vehicle.
Methanol is methyl or wcrod alcohoI. I
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Gasdines for Cleaner Air
Your use of gasoline with detergent
additives will help pr-event deposits
from foxrning in your engine and fuel
system. That helps keep your engine in
tune and your emission control system
workijng properly. 1t”s good for.your
vehicle,
md.,yoU’ll be doing-your part
for cleaner- air.
Many gasolines are now blended with
materials called oxygenates, General
Motors ree.omrnends’that-.you use
ga.s.olines with these blending materials,
suchas MTBEa~~.~~~af?crX.By.doing
so, y.0~ can help clean the air, especially
in those parts. of thecountry that have
high carbon monoxide levels.
.C

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F". i !
P !
In addition, some gasoline suppliers are
now producing reformulated gasolines.
These gasolinesare specially designed
to reduce vehicle emissions. General
Motors recommends that
you use
reformulated gasoline. By doing so, you
can help clean the air, especially in
those parts of the country that have
high ozone levels.
You should.aslc your service station
operators
if their gasolines contain
detergents and oxygenates, and
if they
have been reformulated to reduce
vehicle
emissions.
Fuels in Foreign Countries
If you plan on drivingh another
country outside the
U.S. or Canada,
unleaded
fuel may be hard to find.
Do not use leaded gasoline. If you use
even
one tankful, your emission
controls won't
work well or at all. With
continuous use,
spa& plugs can get
fouled,
the exhaust system can corrode,
and
your engine oil can deteriorate
quickly. Your vehicle's oxygen sensor
will be damaged.
All ofthat means
costly repairs that wouldn't be covered
by
your warranty.
To check on fuel availability, ask an
auto club,
or contact a major oil
cuspany that does business in the
countqrwhere you'll
be driving.
You can also write us at ,the following
address
for advice. Just tell us where
you're
going and give your Vehicle
Identification Number
(VIN) .
General Motors of Canada Ltd.
International Export Sales
P.O. Box 828
Oshawa, Ontario LlH 7N1, Canada

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Filling Your Tank
To remove the fuel filler cap, turn it
slowly to the left (countercloclkse).
gasoline'
orrefueling your .vehicle.
Keep sparks, fhnes, and smolcing
materials away.from gasoline.
..I
I
', 244
-.. , . ,
rl I
A If pu.get gasoiini on YOU
and then som&hing ignit.es it,, . -
..
you, could be badly';burned.
,Gasoline:;'cm spray .out ,011 you if
you' open the.fue1 filler cap ,too
- quickly. .This spray can happen if
your tank,is nearly full, and is more
Iikely in hot weather. Open the.fuel
filler cap .slowly adwait for any
"hiss" noise to stop. Then unscrew
.the cap all the way.
..
While refueling, place the cap in the
depression to the left of the fuel tank
opening.
When you put the cap back on, turn it
to the right
(clockwise) until you hear a
clicking noise.

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NOTICE I
@you ,ne~ed-a.new cap, ‘be .sure to
getthe right type:Your dealer can
wrong type, it may not-fkor have
proper venting, and your Euel:.tank
and emissions system might be
damaged.
.’ get .-one far .you. If you g&the ..
Checking Things Under
the Hood
The following sections tell you how to
check fluids, lubricants and important
parts underhoad.
Hood Release
To open the hood, first pdl the hood
release handle inside the vehicle.
Then lift the rear edge of the hood at
the windshield area.

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Service & Appearance Care
:A Electric. fansunder the hood
can stariup and .injure yuu
even when the engine is not
running. Keep hands, clothing and
tools away frornany underhood
electric
fan.
46
CAUTION
A
Things that burn can get on
hot engine parts and start a
fire. These include liquids like
gasoline,
oil, coolant, brake fluid,
windshield washer and other fluids,
and plastic or rubber. You or others
could be burned. Be careful not to
&op or spill things that will bum
onto a hot engine. Before
closing the
hood, be sure all the
filler caps are on. Then release the
hood
safety strut by moving the strut to the
centered position and lowering the
hood.
Lower the hood'until it is approximately
12 inches (30 cm) above the engine
compartment, then release it. This
should securely latch the hood.
If the hood is still not fully closed and
latched, repeat the
closing procedure by
holding the
hood a little higher before
you release it.

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LT7 hgine (CODE PI
t a Automatic Transmission Fluid
2. Hydraulic Clutch Fluid Reservoir
3. Battery
4. Brake Fluid Reservoir
5. Air Cleaner
Dipstick
(if equipped)
(if equipped)
6. Coolant Recovery
Tank
7. Power Steering Fluid Reservoir
8. Engine Oil Fill Cap
9. Engine Oil Dipstick
IO. Coolant High Fill Reservoir
11. Windshield Washer Fluid Reser aoir

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\!
1 LT5 Engine (CODEJ)
1. Hydraulic Clutch Fluid Reservoir
2. Battery
3. Brake Fluid Reservoir
4. Power Steering Fluid Reservoir
5. Air Cleaner
6. Coolant Recovery Tank
7. Engine Oil Fill Cap
8. Engine Oil Dipstick
9. Coolant High Fill Reservoir
IO. Windshield Washer Fluid Reservoir
.I. 248

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Leaving your hood open and your
underhood lights on can drain your
battery.
If you need to keep the hood
open for an extended period
of time,
remove the Underhood Lights Fuse.
This 1O-amp fuse is located under the
hood on the left-hand marker light
assembly. See the
Index under Fuses &
Circuit Breakers.
Engine Oil
It's a good.idea to check pur engine oil
level every time you get fuel. In order to
get
an accurate reading, the vehicle
must be on level
ground.
If you have the LTl engine, the best
time
to check your engine oil is when
the
engine is warn. If the engine is
mnning, the engine oil won't drain back
into the pan.
Turn off the engine and
give the oil a few minutes to drain back
into the-oil
pan. If you don't, the oil
dipstick might not show the actual
level. If
you have a ZR-1, the best time to
chegk your engine oil is when
the
engine
is cold. If you run the engine, the
engine oil
won't drain back into the pan
fast enough.
Give the oil two hours to
drain
back into the oil pan. If you don't,
the oil dipstick might not
show the
actual level.
249 .