check engine CHEVROLET CORVETTE 1993 4.G Service Manual

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Engine Oil (CONI-.)
To Check Engine Oil:
Pull out the dipstick and clean it with a
paper towel or a cloth, then push it back
in all the way. Remove it again, Beeping
the
tip lower.
LTI Engine: Checking Engine Oil
L15
Engine: Checking Engine Oil
When to Add Oil:
*If the oil is at or below the ADD line,
you'll need to
add some oil.. But you
must use the right kind. This section
explains what kind of ail.to use. For
crankcase capacity, see the Index under
Capacities and Specifications.

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44
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Just fill it enough to put' the level
Somewhere in the proper operating
parge-. Push the dipstick all the-way
back in when you're. through.
Your vehic1.e has- a LOW OIL light-on
the Driver InfomaAion Center that
canes on and stays on if your oil. is '/z to
1% quarts low (see t-he Index tilid&
Low Oil Ljght). Do not wait until this
light comes on to check your oil level.
This light is an added reminder
only-you should check your oil level
regularly.
LT1 Engine: Adding .Engine, Oil
CT5 Engine: Adding Engine Oil
What Kind of Oil To Use
'Lo& fcrr Three Things:
GM4718M
Your Corvette engine requires a
special. oil me,et&g GM Standard
GM4718M. Oils meeting this
Standard may be identified as
synthetic,
and should also. be
identified as API Service SG.
However, not all SynthetkAPI
Service SG oils will meet this GM
Standard. You should lo& for and
use only an .oil that meets GM
Stand;ird GM4718M.
25 I

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I vice &..Appearance Care
z 'A
Throttle Cable Adjusters
Your 1993 Corvette is equipped with
special throttle cable :adjusters.
If you
need-
to adjust the throttle. on your
engine; please see a qualified Chevrolet
,dealer or. refer to the 1993 Corvette-
Service Manual.
256
Automatic Transmission Fluid
When to Check and Change:
A good time to check your automatic
transmission fluid level is when the
engine oil is changed. Refer to the
Mairitenance Schedule-to determine.
when,to change.your fluid. See the
Index under Scheduled Maintenance
Seruices .
How to Check:
Because this operation can be a little
d-#icuft, you. may choose to have :this
dorie at .a Chevrolet dealership Sejrvice
If you do it yourself, be sure. to follow all
the instructions here, or. you could get a
false zeading on the dipstick.
Dt?p,ElI-tment..

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Wait at least 38 minutes .before
checking the transmission fluid level if
you have
been driving:.
When outside temperatures ae above
At high speed for qui-tte a while.
In heavy traffic-especially in hot
To get -the right reading, the fluid
should be at normal op-erating
temperature, which
is 180°F to 200°F
(82OC to 93'C).
90°F (32OC).
we-ather.
To Check T-ransmission Fluid Hot:
Get4he vehicle warmed.:up by driving
abaut 15 miles. (24 h) when outside
temperatures are ab.ove 50°F ( 10OC). If
it's colder than 5OoF (lOC), drive the
vehicle in D (third-gear) until the
engine temperature gage.moves and.
then-remains steady for ten minutes.
Thenfollow the procedures under To
Check the Eluid Hot or Cold.

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Automatic Transmission Fluid
(C.ONT.)
To Check Trafisinission Fluid Cold:.
A cold check is made after the-vehicle
has been sitting for eight hours-or miore
with. the engine offand is used only as :a
feference. Let the,engine run at idle for
five minutes if &utside temper&n%:_s are
50QF (10%) or-mare. If it's colder than
5QoF [lUaC), you may have-to idle the
engine longgr; A hat check must follou7
wheaffuid. is added dw"lqg a cold.check.
To Check the Fluid Hot or Cold
Park your vehicle- on: a- level place.
Place the ;shift lever in P (Park) with
With your foot on the brake pedal,
the .parkingbrake applied.
mave the shift lever through each gear
range, pausing for about three
seconds in each range. Then, p-asition
the-s-hift'lever in P (Park).
minutes ,or more;
Let the engine rd .at idle for three
Then, Without Shutting Off the
Engine, Follow- These Steps:
1. Pull out the dipstick and wipe it with
a
clean rag or paper towel.
2. Push it back in all the. way, wait three
seconds and then pull; h back out
again.
3. Check b.& stdes af the dipstick, and
read the
loweg. limd. The hid he1
must be in the COLD area for a cold
checkor in th-e HOT or er0s.s-
hatched area for a hat checl<.
4. If the fluid level is whe$e it should. be,
push the dipstick b:ack in all the way.

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c How to Add Fluid:
Refer to the Maintenance Schedule to
determine
what kind oftransmission
fluiil to use. See the Index under Fluids.
G Lubricants.
If the fluid level is low, add only enough
of the proper fluid to bring. the level up
to the COLD area.for a cold-check or
the-HQT
area for a-.hot ‘check. It
doesn’t take much fluid, generally legs
than a pint. Don’t overfill. We
recommend
you use only fluid IabeIed
DEXRON@-JIE, because fluids with that
label are made especially
for your
automatic transmission.. Damage caused
by fluid other than DEXXO-Nq-IIE is not
covtir,ed by your-new vehicle warranty.
After adding fluid, recheck the fluid
level as described under How to Check.
When the correct fluid level is obtained,
push
the dipstick back in all the way.
Manual Transmission Fluid
When to Check
A good time to have it checked is when
the
engine oil is changed. Howevw, tbe
fluid in your-manual transmission
doesn’t require-changing.
How to Check:
Becguse this operation can be a iittie
difficult,
you may choose to-have this
done at a Chevrolet dealership Service
Department.
If you do it y.Ourself, be sure to follow
all the instrvctiuns here, or you could
get a false reading.

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Manual Transmisskm fluid
(CONT.)
Check the fluid level only when your
engine is
off, the vehicle is parked on a
level place and the transmission is cool
enough for you to rest your fingers on
the transmission case.
Then, Follow These Steps:
1. Remove the filler plug.
2. Check that the lubricant level is up to
the bottom .df the filler plug hale.
3. If the fluid level is good, install the
plug and be sure it is fully seated. If I
the fluid level is low, add more fluid
as described in the next step.
260
How to Add Fluid:
When you need to add fluid, put in
enough to, bring the level up to -the
bottom of the filler plug hole in the
transmission case. Refer to the
Maintenance Schedule to determine
what
kind of fluid. to use. See the Index
under Fluids G Lubricants.
I
.. .. ,.*Ti
Hydraulic C/ufch
(MANUAL TRANSMISSION)
The clutch linkage in your vehicle is
self-adjusting.
When to Check and What to Use:
Refer to the Maintenance Scheduleb bo
determine how often you should check
the fluid level in your clutch master
cylinder reservoir
and what to add. See
the Index under Owner Checks G.
Sewices and Fluids ,& Lubricants.
HOW to Check and Add Fluid
The clutch master cylinder is under
the Engine Control Module (ECM) in
the left rear area of the engine
compartment.
To check the fluid, look at the area
between the
ECM and the battery.

Downloaded from www.Manualslib.com manuals search engine To add fluid, the ECM unit rnust.be
moved.
Loosen the two nuts-on the ECM unit.
With the
LT1 engine, there is one nut
on the outboard side
o€ the ECM unit
-and
one nut on the inboard side. With
the
LT5 engine, both nuts are on the
inboard side
of the ECM unit.
Move the unit to either side. Do not
disconnect
any wires.
Fluid should be added if the fluid level
iS at
or below the ADD mark on the
reservoir. There are additional.
instructions on the
reservoir cap.
When returning the
ECM to its proper
pasition, make
sure the bolts are
aligned with the: slotsin
the bracket.
Then gently push
down on the unit.
When.replacing
the unit, be careful not
to overtighten the nuts.
Rear Axle
When to Check Lubricant:
Refm to the Maintenance Schedule to
determine how often to check the
lubricant. See the
Index under Periodic
Maintenance Inspections.
How to Check Lubricant:
If the-levelis below the bottom 0.f the
filler
plug hole, you'll need to add some
lubricant, Add enough lubricant to raise
the level to the bottom of the filler plug-
hole.
26 I

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Adding Coolant-LTI Engine
Tb Check Coolant:
Wh& your engine is cold, :che.ck the
dipstick on the cap of the coolant-
recovery .tank. The. coolant level should
be at C.OLD, orst little higher. When
your engine-is wm, the level on the
dips’tiik should be up to HOT, or a
little higher. If your engine is
overheating, see the Index under
Engine Overheating.
Your Corvette als:o- has .a coolant high
fill res.Crvoir lgcated at the-right re,ar of
the engine compartment.

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Adding Coolant-LT1 Engine
(CONT,)
the coolant high fill resekvoir will be
lower.
Add more of the proper mix
through the filler neck until the level
reaches the
base of the filler .neck.
8. Replace the pressure cap. When it's
tight, the arrows on the cap should
line up
with the overflow tube on the
reservoir filler neck. Shut the engine
Off.
9. Then fill the coolant .recovery t,mk to
the proper level.
For complete drain, flush and refill,
contact your Chevrolet dealer
or the
procedure
may be found in a Chevrolet
Corvette Service Manual. To purchase a
Service Manual, see the-Index under
Service Publications.
Adding GooCant-LT5 hgine
To Check Coolant:
When your engine is cold, check the-
dipstick on the cap of the coolant
recovery
tanfr. The coolant level should
be at COLD or a little higher. When
your engine is warm, the level on the
dipstick
should be up to HDT, or a
little higher. If your engine is
overheating, see the
Index under
Evlgirze Overheating.
Your Corvette also has a coolant high
fill reservoir located at the right rear of
the engine'compartrnent.
To Add Coolant:
For more .information on ,adding coolant
to the LT5 engine, see the Index u.nder
Engine Overheating.
If you need more coolant, add the
proper mix at the coolant recovery
tank, but ,only when your engine is cool.
If the tank isvery low or empty, also
add coolant to the coolant high fill
reservoir.
Add coolant to the base of the filler
neck, if needed.