engine BUICK CENTURY 1993 Repair Manual

1
* *
Operating the engine with the air cleaner off
can cause you or others to be burned. The air
cleaner not only cleans the air,
it stops flame if
the engine backfires. If
it isn't there, and the
engine backfires, you could be burned. Don't
drive with
it off, and be careful working on the
engine with the air cleaner
off.
""a, i
NOTICE:
If the air cleaner is backfire- can ,cause a I
Remove and replace the filter. Replace the cover, wing
nut and rubber duct. Tighten
the hose clamp.
damaging engine fire. And, dirt can easily get
into vollr ennine, which
will damage it. Alwav I
havgtt
drivi
-r-
air ner in L)
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Automatic ‘mansaxle Fluid
When to Check and Change:
A good time to check your automatic transaxle fluid level
is when the engine oil is changed. Refer to the
Maintenance Schedule to determine when to change your
fluid. See “Scheduled Maintenance Services” in the
Index.
How to Check:
Because this operation can be a little difficult, you may
choose to have
this done at a Buick dealership Service
Department.
If you do it yourself, be sure to follow all the instructions
here, or you could get a false reading on the dipstick. Wait at least
30 minutes before checking the transaxle
fluid level
if you have been driving:
When outside temperatures are above 90°F (32°C).
At high speed for quite a while.
In heavy traffic-especially in hot weather.
While pulling a trailer.
To get the right reading, the fluid should be at normal
operating temperature, which is
180°F to 200” F (82” C to
93°C).
Get the vehicle warmed up by driving about 15 miles
(24 km) when outside temperatures are above 50°F
(10°C). If it’s colder than 50” F (lO°C), you may have to
drive longer.
To check the fluid level:
Park your vehicle on a level place.
0 Place the shift lever in “P” (Park) with the parking
brake applied.
With your foot on the brake pedal, move the. shift lever
through each gear range, pausing for about three
seconds in each range. Then, position the shift lever in
“P” (Park).
Let the engine run at idle for three to five minutes.
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Then, without shutting off the engine, follow these
steps:
rhe dipstick on the 3300 V6 engine looks like this.
k
The dipstick on the 2.2L L4 engine looks like this.
1,Pull out the dipstick and wipe it with a clean rag
or
2. Push it back in all the way, wait three seconds and
paper towel.
then pull it back out again.
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Engine Coolant
The following explains your cooling system and how to
add coolant when it is low.
If you have a problem with
engine overheating, see “Engine Overheating” in the Index. \
The proper coolant for your Buick will:
Give freezing protection down to -34°F (-37°C).
Give boiling protection up to 262” F (128” C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights work as they should.
What to Use: Use a mixture of one-half clean water
(preferably distilled) and one-half antifreeze that meets
“GM Specification 1825-Mi’ which won’t damage
aluminum parts. You can also use a recycled coolant
conforming to GM Specification 1825-M with a complete
coolant flush
and refill. Use GM Engine Coolant
Supplement
(sealer) with any complete coolant change. If
you use these, you don’t need to add anything else.
I
A CAUTION:
Adding only plain water to your coollng system
can
be dangerous. Plain water, or some other
liquid
like alcohol, can boil before the proper
coolant mix will. Mur vehicle’s coolant
warning system
Is set for the proper coolant
mix. With plain water or the wrong mlx, your
engine could get too hot but you wouldn’t get
the overheat warning. bur engine could catch
fire and you or others’could be burned. Use a
50/50 mPx of clean water and a proper
antifreeze.
I
: warranty. Too much
l
and crack t
other parts
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Adding Coolant
..
The coolant recovery tank is located on the passenger’s
side
of the engine compartment.
To Check Coolant: When your engine is cold, the
coolant level should be at “ADD:’
or a little higher.
When your engine
is warm, the level should be up to
“FULL HOT:’ or a little higher.
To Add Coolant: If you need more coolant, add the
proper
mix at the coolant recovery tank.
/i CAUTION:
Turning the radiator pressure cap when the
engine and radiator are hot can allow steam
and scalding liquids to blow out and burn you
badly.
With the coolant recovery tank, you will
almost never have
to add coolant at the
radiator. Never turn the radiator pressure
cap-even
a little-when the engine and
radiator are hot.
Add coolant mix at the recovery tank, but be careful not
to spill it.
A CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene
glycol, and
it will burn if the engine parts are
hot enough. Don’t spill coolant on
a hot
engine.
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Radiator Pressure Cap
ur radiator cap is a 15 psi (105 kPa)
When you replace your radiator pressure cap, an AC@
cap is recommended.
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a preset temperature.
When you replace
your thermostat, an AC@ thermostat is
recommended.
Power Steering Fluid
mp ”-- How to Check Power
Steering Fluid:
I Unscrew the cap and wipe
the dipstick with a clean f rag. Replace the cap and
completely tighten it. Then
remove the cap again and
look at the fluid level on the
dipstick. .1,. ,,
When me engine compartment is hot, the level should
When the engine compartment is cool, the level should
be at the “H” (Hot) mark.
be at the “C” (Cold) mark.
What to Add:
Refer to the Maintenance Schedule to determine what
kind
of fluid to use. See “Recommended Fluids and
Lubricants” in the Index.
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When adding power steering fluid or making a
complete fluid change, always use the proper
fluid. Failure to use the proper fluid can cause
leaks and damage hoses and seals.
,- . ,.
Windshield Washer Fluid
To Add:
The windshield washer reservoir is located at the driver’s
side
of the engine compartment. The rear window washer fluid reservoir (for the wagon)
is the smaller
reservoir next
to the coolant recovery tank.
Open the cap labeled “WASHER FLUID ONLY? Add
washer fluid until the bottle
is full.
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Brake Master Cylinder
I
Your brake master cylinder is here. It is filled with
DOT-3 brake fluid.
There are only two reasons why the brake fluid level in
your master cylinder might go down. The first is that
the
brake fluid goes down to an acceptable level during normal brake lining wear. When new linings are put in,
the fluid level goes back
up.
The other reason is that fluid is leaking out of the brake
system.
If it is, you should have your brake system fixed,
since a leak means that sooner
or later your brakes won’t
work well, or won’t work at all.
So, it isn’t a good idea to “top off’ your brake fluid.
Adding brake fluid won’t correct a leak. If you add fluid
when your linings are worn, then you’ll have too much
fluid when you get new brake linings.
You should add (01
remove) brake fluid, as necessary, only when work is
done on the brake hydraulic system.
A CAUTION:
If you have too much brake fluid, it can spill on
the engine. The fluid
will burn if the engine is
hot enough. Mu or others could be burned,
and your vehicle could
be damaged. Add
brake fluid only when work is done on the
brake hydraulic system.
When your brake fluid falls to a low level, your brake
warning light will come on. See “Brake System Warning
Light” in the Index.
What to Add:
When you do need brake fluid, use only DOT-3 brake
fluid-such as Delco Supreme
ll@ (GM Part No.
1052535). Use new brake fluid from a sealed container
only.
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Vehicle Identification Number 0
1
0
SAMPLE4UXPM072675 (cml
This is the legal identifier. for your Buick. It appears on a
plate in the front comer
of the instrument panel, on the
driver’s side.
You can see it if you look through the
windshield from outside, your vehicle. The VIN also
appears on the Vehicle Certification and Service
Parts
labels and the certificates of title and registration.
Engine Identification
The eighth character in your VIN is the engme code for
your
GM engine. This code will help you identify your
engine, specifications, and replacement parts
in this
section.
Service Parts Identification Label
You’ll find this label on your spare tire cover in the coupe
or sedan.
In the wagon, you’ll find the label on the wheel
well (remove the spare tire cover to expose the wheel
well). It’s very helpful
if you ever need to order parts.. On
this label is:
Your VIN.
Its model designation.
Paint information.
A list of all production options and special equipment.
Be sure that
this label is not. removed from. the vehicle.
Add-on Electrical Equipment
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Fuse Usage
I
I
Fuse Rating
(AMPS)
A
B
C
D E
15
20
10
10
15
ECM; MAF Sensor (3300 Engine only)
ECM Injectors/Coil
Eng. A/C Relay; EGR Solenoid; Canister Purge Solenoid
Fan/Elect; Generator; DRL Module
Turn Signal Flasher; Back-up Lights;
TruWLiftgate Release
Fuse
F
G
H
I
J
K
L
M
Rating
(AMPS)
10
20
20
10
20
20
30"
5
Circuitry N
0
P
Q
10
30"
25
20
15
15
15
Circuitry
Supplemental Inflatable Restraint (Air Bagj
Tail; Park; Side Marker; License Plate; Stop/Turn Signal
Heater/Air Conditioner
Gages; Warning Indicators; Torque Convert
Clutch; Audible Warning System; Computer Command Control; Trunk Release; Brake
Warning Indicator; Rear Defog Switch;
Speedometer
Stop Lights; Hazard Flashers
Interior, Underhood, Courtesy, I/P, Trunk Lights; Door
Locks; Horn Relay, Passive Restraint
System, Deck Lid Release, Power Antenna
Liftgate Release; Power Windows
Illumination for: I/P, Radio,
Pod Lights,
Ashtray, Console Light, Heater-A/C Control,
Defog Switch, Headlight Switch
Radio, Cruise Control
Seats, Door
Locks, Rear Defog
Windshield Wipe/Wash
Cigarette Lighter
Safety Belt/Chirne (ICAM) Module (Located
behind the fuse block, above the hush panel.)
Remote Lock Control (Located behind the fuse
block, above the hush panel.) Fuel Pump, ECM (Located under the hood.)
*Circuit Breaker
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