1988 PONTIAC FIERO Service Repair Manual

6E3-C2-"l s5.OL (VIN F) & 5.7b (VIN 8) DRIVEABILITY AND EMISSIONS
FUEL RAIL
26 FUEL PRESSURE CONNECTION ASSEMBLY
27 DEAL - FUEL PRESSURE CONNECTION ASSEMBLY
28 CAP -FUEL PRESSURE CONNECTION ASSEMBLY
06 85 84 5S 1509-6E
Figure
C2-'11 Fuel Pressure Connection Assembly
FUEL PRESSURE CONNECTION ASSEMBLY
(Figure
CZ-'I I)
Remove or Disconnect
1. Negative battery cable.
2. Relieve fuel system pressure following "Fuel
Pressure Relief' procedure.
a Clean
@ Area around valve and connection with AC
Delco X-30A or equivalent.
3. Fuel pressure connection assembly (26) and seal
(27). Discard seal
Install or Connect
I. New seal (27) on fuel pressure connection
assembly
(26).
2. Fuel pressure connection assembly (26)in fuel rail.
- @ Fuel pressure connection assembly to 10.0
Norn (88.0 in. Ibs.
3. Negative battery cable.
inspect
@ Energize fuel pump and check for leaks.
FUEL INJECTORS
(With Fuel Wail Removed)
Each port injector is located and held in position by
a retainer clip that must be rotated to release
and/or
lock the injector in place, as shown in Figure (22-12.
FUEL RAIL
I 85 INJECTOR - PORT I
Figure CZ-12 Port Injector with Injector Retainer Clip
a Remove or Disconnect
1. Rotate injector retaining clip(s) (87) to unlocked
position.
2. Injectors (85).
+$ Disassemble
1. Injector O-ring seals (86) from both ends of
injectors
(85) and discard.
Assemble
@ New O-ring seals (86) and install on injectors (85).
Install or Connect
1. Injectors
to fuel rail and pressure regulator
assembly
(1 1).
2. Rotate
injector retainer clips (87) to loclring
position (Figure C2-12).
PRESSURE REGULATOR
(With Fuel Rail Removed)
Important
The pressure regulator is factory adjusted and is
not serviceable. Do not attempt to remove regulator
cover.
Remove or Disconnect
1. Front crossover tube retainer attaching screw
assembly
(235) and crossover tube retainer (234)
on right hand rail side.
2. Retainer to base screw assembly (273)
and rear
crossover tube retainer
(270) at pressure regulator
and base assembly (240).

DRIVEABILITY AND EMISSIONS 5.OL (VIN F) & 5.7L (VIN 8) 6E3-C2-11
3. Separate left hand fuel rail and plug assembly
(200) from right hand fuel rail and plug assembly
(220).
4. Bracket-to-rail
attaching screw assembly (256),
two bracket-to-base attaching screw assemblies
(258) and pressure regulator and base assembly
bracket
(255).
5. Screw
assembly (235), which attaches fuel outlet
tube to right hand rail (220).
6. Base to right hand rail screw assembly (275).
7. Pressure regulator and base assembly (240) from
right hand rail assembly (220).
8. Rotate regulator and base assembly to remove
from fuel outlet tube.
9. Base to rail connector (250).
10. O-ring seals and discard:
@ Connector (252).
@ Fuel outlet tube (224).
@ Rear crossover tube (267).
@ Front crossover tube (232).
Important
When removing O-ring seals, note locations and
sizes, to assure correct replacement and re-
assembly.
Inspect
@ O-rings and sealing surfaces, for damage that
could prevent proper sealing.
- Replace any damaged O-ring seals.
n Install or Connect
1. Lubricate with engine oil, and install O-ring seals:
@ Connector (252).
@ Fuel outlet tube (224).
@ Rear crossover tube (267).
@ Front crossover tube (232).
Base-to-rail connector (250) in pressure regulator
and base assembly (240).
Regulator and base assembly on fuel outlet tube.
Rotate the regulator and base assembly to install
base to rail connector
(250) into right hand rail
assembly
(220).
Base to right hand rail screw assembly (275).
Pressure regulator and base assembly bracket
(2551, two brackets to base attaching screw
assembly (258) and bracket to rail attaching screw
assembly (256).
Rear bracket attaching screw assembly
(235).
Left hand rail and plug assembly (2001, with front
and rear crossover tubes (230) and
265), to right
hand rail and tube assembly
(220).
Rear crossover tube retainer (270) and retainer to
base screw assembly
(273).
240PRESSUREREGUbATORAND
BASE ASSEMBLY
Figure C2-13 Fuel Pressure Regulator
10. Front crossover tube retainer (234) and retainer
attaching screw assembly
(235).
Tighten
@ Above mentioned seven assemblies to 5 N-m
(44 in. lbs.).
COLD START FUEL INJECTION SWITCH
Remove or Disconnect
1. Air inlet duct.
2. Alternator bracket.
3. Electrical connector
4. Switch.
Install or Connect
1. Coat threads with pipe sealant.
2. Reverse
removal procedure to reinstall.
THROTTLE BODY
Remove or Disconnect
I. Air inlet duct.
2. IAC and 'I'PS connectors.
3. Vacuum lines.
4. Coolant hoses (2).
5. 'I'hrottle, 'L'V, and cruise control cables.
6. Throttle body retaining bolts.
a Install or Connect
1, Reverse procedure to reinstall.
2. Refill
radiator with lost coolant. Refer to Figure
C2-14 for torque specifications.

6E3-C2-12 5.OL (VIN F) & 5.7L (VIN 8) DRIVEABILITY AND EMISSIONS
UNIT REPAIR PROCEDURES
Figure C2-14 Throttle Body Removal
THROTTLE BODY SERVICE
IDENTIFICATION
An eight digit identification number is stamped
on the throttle body casting, next to the coolant cover,
as shown in Figure C2-15. Refer to this model
identification number if servicing or part replacement
is required.
Names of component parts will be found on the
numbered list that accompanies the exploded view
(Figure
C2-18). Numbers used to identify parts in the
exploded views also are used to identify the same parts
in other illustrations of this manual.
IDENTIFICATION NUMBER
Figure C2-15 Throttle Body Identification
TPS Adjustment
Refer to Section "C-1" for TPS replacement or
adjustment. The unit repair procedures cover component
replacement with the unit on the vehicle. However,
throttle body replacement requires that the complete
unit be removed from the engine. If removed, it may
be placed on a holding fixture, such as
5-9789-118, BT-
3553, or equivalent, to prevent damage to the throttle
valve.
Cleaning and a Inspection
Throttle body parts, except as noted below, may be
cleaned in a cold-immersion-type cleaner such
a; AC
Delco X-55 or equivalent.
NOTICE: The throttle position sensor (TPS), idle air
control
(IAC) valve, throttle body with
cover and seals or gaskets in place, should
NOT be soaked in liquid solvent or
cleaner, as they may be damaged. If TPS
or IAC valve is still mounted in the
throttle body, do not immerse throttle
body.
I. Clean all metal parts throughly and blow dry with
shop air. Be sure all air passages are free of burrs
and dirt.
2. Inspect mating casting surfaces for damage that
could affect gasket sealing.
MINIMUM IDLE SPEED CHECK
The idle stop screw (161, used to regulate
minimum idle speed of the engine, is adjusted at the.
factory, then is covered with a plug (15) to discourage
unnecessary readjustment. However, if it is necessary
to gain access to the idle stop screw assembly, proceed
as shown in Figure C2-16.
Before checking minimum idle speed, be sure
ignition timing is correct and, before making any idle
speed adjustments, be sure throttle body is clean
around the throttle plates.
Adjust
1. Pierce
the idle stop screw plug (15) with an awl,
and apply leverage to remove it.
2. Adjust idle stop screw assembly
(16) as required.

DRIVEABILITY AND EMISSIONS 5.OL (VIN F) & 5.7b (VIN 8) 6E3-CZ-13
IDLE STOP SCREW
ASSEMBLY

IDLE STOP
SCREW PLUG
Figure C2-16 Removing Idle Stop Srew Plug
60 IDLE AIR/VACUUM SIGNAL HOUSING
70 IDLE AIR CONTROL VALVE (IAC)
71 IAC GASKET
Figure C2-17 Idle Air Control Valve Assembly
3. With IAC motor connected, ground diagnostic
terminal. Measure
4. Turn "ON" ignition, do not start engine. Wait at @ Distance from gasket mounting surface of IAC
least 30 seconds. valve assembly
(70) to tip of pintle,
5. With ignition
"ON", disconnect IAC electrical (Dimension
"A" in Figure C2-17).
connector.
Important
6. Disconnect
the distributor set-timing connector.
7. Start
engine and allow to go "Closed Loop".
8. Remove
ground from diagnostic terminal.
9. Adjust idle stop screw to 400 rpm 5.01,, 450 rpm
5.7L in neutral for manual or automatic
transmission vehicles.
10. Turn ignition "OFF" and reconnect connector at
IAC motor.
11. Adjust TPS, if necessary:
@ With ignition "ON", use a "Scan" tool or 3
jumper wires and adjust TPS to obtain .54 volt
+ .08 volt. - @ Tighten screws, then recheck reading to
insure adjustment has not changed.
12. Start engine and inspect for proper idle operation.
IDLE AIR CONTROL VALVE ASSEMBLY AND
CASKET
ORemove or Disconnect
1. Electrical connector at idle air control valve
assembly (70).
2. IAC valve assembly from IACVIcoolant cover
assembly.
3. IAC valve assembly gasket (71) and discard.
NOTICE: Before installing new idle air control valve
assembly, the position of its
pinlle MUST
be checked. If pintle is extended too far,
damage to the assembly
may occur
Adjust
If distance is greater that 28 mm (1 118 in.), reduce
it as follows:
a. If IAC valve assembly has a "collar" around
electrical connector end, use firm hand pressure
on pintle to retract it. (A slight side-to-side motion
may help.)
b. If
IAC valve assembly has no "collar", compress
pintle-retaining spring toward body of IAC valve
and try to turn pintle clockwise.
@ If pintle will turn, continue turning until
28mm
(1 118 in.) is reached. Return spring to
original position, with straight part of spring
end lined up with flat surface under pintle
head.
@ If pintle will not turn, use firm hand pressure
to retract it.
Install or Connect
1. New IAC valve assembly gasket (71) on IAC valve
assembly
(70).
2. IAC valve assembly in IACVIcoolant cover
assembly (61).
Tighten
IAC valve assembly to 18N.m (13 ft. Ibs.), with
wrench on hex surface only.
3. Electrical connector at IAC valve assembly (70).

DRIVEABILITY AND EMISSIONS 5.OL (WIN F) & 5.7L (WIN 8) 6E3-C2-15
Important
No physical adjustment is made to the IAC
assembly after installation. IAC
valve resetting
occurs after reinstallation on the vehicle, and is
reset after the engine is started and then the
ignition turned "OFF".
THROTTLE BODY
PARTS INFORMATION
FIGURE CZ-18
PART NAME PART #
. Gasket Flange ......................... 1
Throttle Body Assembly .................. 10
Plug . Idle Stop Screw .................... 15
Screw Assembly - Idle Stop. ................ 16
Spring
- Idle Stop Screw ................... 17
Sensor - Throttle Position (TPS) ............. 20
Screw Assembly
- TPS Attaching ............ 21
Retainer
- TPS Attaching Screw ............. 22
Cover-CleanAir........................ 41
Screw Assembly
- Clean Air Cover
Attaching...
.......................... 42
Gasket
- Clean Air Cover .................. 43
IACVICoolant Cover Assembly ............. 61
Screw Assembly
- IACV Cover
Assembly to Throttle Body
................ 62
Gasket
- IACVICoolant Cover to
Throttle Body..
........................ 63
Valve Assembly
- ldle Air Control
(IAC) ................................ 70
Gasket
- IAC Valve Assembly .............. 71
CLEAN AIR COVER AND GASKET
ORemove or Disconnect
1. Clean
air cover attaching screw assemblies (42)
2. Clean air cover (41).
3. Clean air cover gasket (43).
@ Cover mounting surface to ensure a good seal.
Install and Connect
1. New clean air cover gasket (43) on throttle body
assembly
(10).
2. Clean air cover (41).
3. Clean air cover attaching screw assemblies (42).
61 IACVICOOLANT COVER ASSV 62 SCREW ASSY . IACV COVER ASSY TO THROrRE BODV 63 GASKET. IACV COOLANT COVER TO THROTTLE BODY 70 VALVE ASSV -IDLE AIR CONTROL 71 GASKET - IDLE AIR COHTROLVALVE
Figure C2-19 ldle Air Control/Coolant Cover
Assembly
IDLE AIR CONTRBLICOOLANT COVER
ASSEMBLY (Figure
CZ-19)
(With Throttle Body Removed From Engine)
a Remove or Disconnect
1. Idle
air control (IAC) valve assembly (70) from
IACVIcoolant cover assembly. (See "Idle Air
Control Valve and Gasket" instructions.)
2. IACV
cover assembly to throttle body screw
assemblies
(62).
3. Cover assembly (61).
4. Cover
assembly to throttle body gasket (63) and
discard.
alnstall or Connect
Clean
e Throttle body gasket mounting surface to
ensure a good seal.
e Sealing surface for damage that could prevent
sealing properly or
cause coolant leak.
a Install and Connect
1. New IACVIcoolant cover
assembly to throttle body
gasket
(63).
2. IACV/coolant cover assembly (61).
3. IACV
cover assembly to throttle body screw
assemblies
(62).

6E3-CZ-16 5.OL (VIN F) & 5.7L(VIN 8) DRIVEABILITY AND EMISSIONS
Tighten
- @ Screw assemblies to 3.0 Nem (27.0 in. lbs.).
4. IAC valve assembly (70). (See "Idle Air Control
Valve and Gasket" instructions).
NOTICE: Before installing the IAC valve assembly,
the position of its pintle
MUST be checked.
If pintle is extended too far, damage to the
assembly may occur. (See
"Idle Air
Control Valve and Gasket" instructions.)
FUEL PUMP RELAY
The fuel pump relay is mounted in the engine
compartment (see Figure
C2-20). Other than
checking for loose connectors, the only service possible
is replacement.
BRAKE BOOSTER
Figure C2-20 Fuel Pump Relay
OIL PRESSURE SWITCH
The oil pressure switch is mounted as shown in
Figures C2-2
1.
Figure C2-21 Oil Pressure Switch
a Remove or Disconnect
I. Electrical connector.
2. Oil pressure switch.
Install or Connect
1. Make sure fittings (41) are properly aligned to
allow switch installation.
2. Oil pressure switch.
3. Electrical connector.
PARTS INFORMATION
PART NAME GROUP
Injector, fuel ......................... 3.300
Pump, Fuel (In-Tank)
.................. 3.900
Relay, Fuel Pump
..................... 3.900
Switch, Oil Pressure,
................... 1.800
Valve Asm, Idle Air Control: Part
Of Control Kit, Idle Air Valve. .......... 3.820
Regulator, Fuel Pressure
................ 3.164
Itail, Fuel Feed ....................... 3.330

DRIVEABILITY AND EMISSIONS 5.OL (VIN F) & 5.7L (VIN 8) 6E3-CZ-17
BLANK