1988 PONTIAC FIERO Service Repair Manual

6B-I4 ENGINE COOLING
SMALL
586826
Fig. 26 Removing Oil Cooler Gasket
4. Remove old rubber gaskets, throw away, clean
and dry seal areas.
5. Place rubber gaskets on a new oil cooler and place
onto outlet tank fitting holes, being careful not to
loosen or misalign gaskets. Gaskets must be
installed dry and free of dirt and oil.
6. Install
and tighten nuts snugly onto fittings.
7. Torque nuts
to 20
N.m (15 lb. ft.). Overtorquing
could cut the rubber gaskets.
8. Replace
tank as previously described.
9. Test radiator.
Recore
If the radiator core is damaged beyond repair and
the other parts are serviceable, install the original inlet
and outlet tanks, oil cooler, radiator cap, and drain
valve, onto a new core and install new gaskets.
Drain Cock
Oil Cooler Replacement If the drain cock does not seal when tightened
snugly, remove the drain cock, clean drain and replace.
1. Remove
the outlet tank as previously outlined. If
the body of the draincock is broken, remove the body
from the tank by squeezing the sides together with
2. Remove nuts from the oil cooler fittings.
needle nose pliers (Fig. 9).
Remove oil cooler and gaskets from tank. Special Tools
Special tools are available through normal
channels for servicing the aluminum-plastic radiator.
The universal Cooling System and Cap Pressure
Tester, BT-7518 or J-24460-01, can also be used with
the aluminum-plastic radiator.
ON-VEHICLE SERVICE
THERMOSTAT
Remove or Disconnect
1. Battery negative cable at battery.
2. Air cleaner.
3. Drain cooling system.
4. Thermostat housing attaching bolts and remove
housing. Remove thermostat from manifold.
Clean
Clean housing and manifold sealing
surfaces.
Install or Connect
1. New gasket.
2. Thermostat in intake manifold.
3. Refer
to Section 6E3 for plenum and throttle
body installation.
4. Battery negative cable.
5. Fill cooling system.
6. Start engine and run, with radiator cap removed,
until radiator upper hose becomes hot
(thermostat open). 7.
With
engine idling, add coolant to radiator until
level reaches bottom of filler neck.
8. Cap making sure arrows line up with overflow
tube.
18-24 N,m (13-18 FT. LBS.)
Fig. 601 Thermostat - V.I.N. S

ENGINE COOLING 6B-15
1. 27 N-m (20 LBS. FT.)
2. 34 N.m (25 LBS. FT.)
Fig. 602 Thermostat - V.I.N. E, F and 8
ELECTRIC COOLING FAN
CAUTION: Keep hands, tools, and
clothing away from engine cooling fan
to help prevent personal injury. This
fan is electric and can come on
whether or not the engine is running.
The fan can start automatically in
response to a heat sensor with the
ignition in the "On" position.
Remove or Disconnect
1. Negative battery cable.
2. Harness from fan motor and fan frame.
3. Fan
frame to radiator support attaching bolts.
4. Fan and frame assembly.
Install or Connect
1. Fan and frame assembly.
2. Fan frame to radiator support attaching bolts and
torque to specification.
3. Harness
to fan frame and fan motor.
4. Negative battery cable.
Inspect
For proper completion of repairs.
For operation of fan motor.
WATER PUMP
Remove or Disconnect
1. Battery negative cable at battery.
2. Cooling system.
3. If equipped with M.F.I., remove air intake tube
and mass air flow sensor.
4. Fan and radiator upper support, as applicable.
5. Serpentine belt.
6. Generator upper and lower brackets, A/C brace
and bracket and, if equipped, power steering
pump lower bracket from water pump and swing
aside.
7. Radiator lower hose and heater hose from water
Pump.
8. Water pump to block attaching bolts and remove
water pump.
Install or Connect
s If installing a new water pump, transfer
heater hose fitting from old unit.
With clean sealing surfaces on both block and water
pump, install water pump to block with new gaskets
and retain with attaching bolts. Torque to specifica-
tions. (V6 small bolt
10N.m, 7 lb. ft., large bolt and
nut 20
N-m, 15 lb. ft.) (V8-40 Nsm, 30 lb. ft.)
Radiator lower hose and heater hose to water pump
and torque clamps to 2
N.m (20 lb. in.).
Generator upper and lower brackets and, if
equipped, the power steering pump lower bracket to
the water pump. Torque bolts to 41
N.m (30 lb. in.).
Serpentine belt.
If equipped with M.F.I., install air intake tube
and mass air flow sensor.
Fan and radiator upper support, as applicable.
Battery negative cable.
Fill cooling system with an ethylene glycol
antifreeze and water mixture of
50/50.
Start engine and run, with radiator cap removed,
until radiator upper hose becomes hot
(thermostat open).
With engine idling, add coolant to radiator until
level reaches bottom of filler neck.
Cap, making sure arrows line up with overflow
tube.
Fig. 603 Fan Mounting V.I.N. E, S (All) F, 8 (wlo A/C)

6B-16 ENGINE COOLING
Fig. 604 Fan Mounting - V.I.N. F and 8 (with A/C)
1. 41 N-m (30 LBS. FT.)
Fig. 605 Water Pump Mounting -- V.I.N. S Fig. 606 Water Pump Mounting - V.I.N. E, F and 8
COOLANT RECOVERY EDOUTLE
Remove or Disconnect
1. Hose from recovery bottle.
2. Attaching screws and remove bottle.
Clean Install
or Connect
1. Place bottle in vehicle and torque attaching
screws to
3 N-m (27 1b.in.).
2. Coolant hose to bottle.
3. Fill bottle to appropriate mark.
@ Recovery bottle with suitable solution.

ENGINE COOLING 68.17
RADIATOR
Remove or Disconnect
1. Negative battery cable.
2. Engine coolant.
3. Fan blade. On fan clutch equipped cars, store
clutch in upright position to prevent seal leakage.
4. Upper and lower radiator hoses.
5. On vehicles equipped with automatic
transmission, plug transmission cooler lines.
6. Fan shield assembly, if applicable.
7. Radiator and shroud assembly, lift straight up.
The radiator assembly is held at the bottom by
two cradles secured to the radiator support.
Install or Connect
1. If new radiator, transfer fittings from old radiator
to new radiator.
Radiator in car, locating bottom of radiator in
lower mounting pads.
Transmission/Engine oil cooler lines at radiator.
Coolant recovery bottle hose at radiator.
Coolant hoses at radiator.
6. Upper radiator support bracket.
7. Engine coolant.
8. Negative battery cable.
Inspect -
e For proper completion of repair.
e For fluid leaks.

88-18 ENGINE COOLING
THE INDICATOR MARK ON THE MOVEABLE PORTION OF
THE TENSIONER MUST BE WITHIN THE LIMITS OF THE
SLOTTED AREA ON THE STATIONARY PORTION OF THE
TENSIONER. ANY READING OUTSIDE THESE LIMITS INDI-
CATES EITHER A DEFECTIVE BELT OR TENSIONER.
Fig. 608 Belt Tensioner - V.I.N. S
1. USED BELT ACCEPTABLE WEAR RANGE
2. NEW BELT RANGE
5. FIXED BELT LENGTH INDICATOR
6. WITH NEW BELT INSTALLED, FIXED POINTER
MUST FALL WITHIN THIS RANGE
7. MINIMUM LENGTH - NEW BELT
8. NOMINAL LENGTH - NEW BELT
9. MAXIMUM LENGTH - NEW BELT
10. REPLACE BELT POSITION
Fig. 609 Belt Tensioner - V.I.N. E, F and 8

ENGINE COOLING 6B-19
1. TENSIONER ASSEMBLY
2. ROTATE TENSIONER IN DIRECTION
SHOWN TO INSTALL OR REMOVE BELT
3. GENERATOR ASSEMBLY
4. ACCESSORY DRIVE BELT
5. PIS PUMP
6. WATER PUMP
7. CRANKSHAFT
8. A.I.R. PUMP
Fig. 610 Belt Diagram - V.I.N. E, F and 8
1. GENERATOR 5. WATER PUMP
2. TENSIONER 6. CRANKSHAFT
3. BELT 7. A.I.R. PUMP
4. PIS PUMP 8. AIC COMPRESSOR J10009-68-F
Fig. 611 Belt Diagram -- V.I.N. S (Manual Transmission)

6B-20 ENGINE COOLING
1. GENERATOR 5. WATER PUMP
2. TENSIONER 6. CRANKSHAFT
3. BELT 7. BELT IDLER
J10010-6B-F
Fig. 612 Belt Diagram - V.I.N. S (Automatic Transmission)

ENGINE FUEL BC-1
SECTION 6C
NE FUEL
CONTENTS
General Description ..................................... 6C-1 Fuel
Cap ........................................................... 6C-3
.................................................. ............................................. Alcohol-In-Fuel 6C- 1 Fuel Filter Neck 6C-3
................... ............ Fuel Metering .................................................. 6C-2 Fuel Gage Sending Unit .. 6C-4
....................... ............................... Throttle Body Injection (TBI) .... 6C-2 Diagnosis ,. 6C-4 ................... Service
Procedures ............................................. 6C-4
Port Fuel Injection ...................................... 6C-2
Pressure Relief ........................................... 6C-4
Fuel Feed and Return Pipe
............................... 6C-2
Flow Test .................................................... 6C-4
Fuel Pipes (MPFI)
.......................................... 6C-3
Pressure Test - TBI ................................... 6C-4
Fuel and Vapor Hoses
....................................... 6C-3
Pressure Test - MPFI .................................... 6C-4
Fuel Pump ........................................................ 6C-3 ...................................................... Fuel Pump Relay .............................................. 6C-3 Fuel Tank 6C-4
Fuel Filter
......................................................... 6C-3 Accelerator Controls ...................................... 6C-5
Fuel Tank
....................................................... 6C-3
All new General Motors vehicles are certified by
the United States Environmental Protection Agency as
conforming to the requirements of the regulations for
the control of air pollution from new motor vehicles.
This certification is contingent on certain adjustments
being set to factory standards. In most cases, these
adjustment points either have been permanently
sealed and/or made inaccessible to prevent
indiscriminate or routine adjustment in the field. For
this reason, the factory procedure for temporarily
removing plugs, caps, etc., for purposes of servicing the
product must be strictly followed and, wherever
practicable, returned to the original intent of the
design.
GENERAL DESCRIPTION
All gasoline engines are designed to use only
unleaded gasoline. Unleaded gasoline must be used for
proper emission control system operation. Its use will
also minimize spark plug fouling and extend engine oil
life. Using leaded gasoline can damage the emission
control system and could result in loss of emission
warranty coverage.
All cars are equipped with an Evaporative
Emission System. The purpose of the system is to
minimize the escape of fuel vapors to the atmosphere.
Information on this system will be found in Section
6E2, or 6E3.
When working on the fuel system, there are
several things to keep in mind.
@ Any time fuel system is being worked on,
disconnect the negative battery cable
except for those tests where battery
Adhere to all Notices and Cautions.
Always keep a dry chemical (Class B) fire
extinguisher near the work area.
-
Always use a backup wrench when loosening or
tightening a screw couple fitting.
The torque on a screw fitting is
30 N-m (22 lb.
ft.).
Pipe is used on all MPFI, TPI, SFI, and TBI
applications. Fittings require the use of an
"0"
Ring. Replace all pipe with the same type of pipe
and fittings that were removed.
All fuel pipes must meet GM Specification
124-M, or its equivalent.
All fuel hoses must meet GM Specification
6163-M, or its equivalent.
Do not replace fuel pipe with fuel hose.
voltage is required.
@ On MPFI, TPI, SF1 and TBI systems, always A1cohol-ln-Fuel
relieve the line pressure before servicing any fuel Certain driveability complaints such as
system components. hesitation, lack of power, stall, no start, etc., may be
@ Do not repair the fuel system until you have read caused
by an excessive amount of alcohol-in-fuel. The
the copy and checked the illustrations relating to complaints
may be due to fuel system corrosion and
that repair. subsequent
fuel filter plugging, deterioration of rubber