Pontiac Fiero 1988 Service Manual page 544

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-C2-13
1 S T U D ( 2 ) 1 7 N-m ( 1 2 F T LBS)
T B I A S M
3 G A S K E T
7S 3173-6E
Figure C2-19 - Replacing
TBI 700
Unit-2.5L
Engine
9,
Turn ignition "OFF" and reconnect IAC valve
electrical connector.
10. Use silicon sealant or equivalent to cover
minimum idle adjustment screw hole.
11. Unplug any plugged vacuum ports.
THROTTLE BODY INJECTION UNIT
Replacement (Figure C2-19)
Remove or Disconnect
1.
2.
3.
4.
5.
Electrical connectors for IAC valve, TPS, and fuel
injector.
Grommet with wires from fuel meter assembly.
Throttle linkage, return spring(s), transmission
control cable and cruise control (wherever
applicable).
Vacuum hoses, noting positions of hoses.
Inlet and outlet fuel line nuts, using back-up
wrench J-29698-A or BT-8251-A.
CAUTION.
Refer to fuel p r e s s u r e relief
p r o c e d u r e ( a b o v e ) b e f o r e
disconnecting fuel lines.
6. Fuel line o-rings from nuts and discard.
7. TBI mounting hardware.
8. TBI unit from intake manifold.
9. TBI flange (manifold mounting) gasket and
discard.
NOTICE:
Stuff the manifold opening with a rag to
prevent material from entering the
engine, and remove the old gasket
material from surface of intake manifold.
Inspect
• Manifold bore for loose parts, foreign material, etc.
• Intake manifold sealing surface for cleanliness.
|-»+| Install or Connect
1. New TBI flange (manifold mounting) gasket.
2. TBI with mounting hardware.
Tighten
• Mounting hardware to 17N-m (12 lb. ft.).
3. New o-rings on fuel line nuts.
4. Fuel line inlet and outlet nuts by hand.
Tighten
• Inlet and outlet nuts to 27 N-m (20 lb. ft.).
(Use back-up wrench to keep TBI nuts from
turning.)
5. Vacuum hoses.
6. Throttle linkage, return spring(s), transmission
control cable and cruise control (wherever
applicable).
7. Grommet with wires to fuel meter assembly.
8. Electrical connectors, making sure connectors are
fully seated and latched.
9. Check to see if accelerator pedal is free by
depressing pedal to the floor and releasing while
engine is "OFF".
10. With engine "OFF" and ignition "ON," check for
leaks around fuel line nuts.
11. Start engine and check for fuel leaks.
FUEL HOSE/PIPE ASSEMBLIES
Materials
Fuel Lines - Welded steel tubing meeting GM
Specification 124-M or its equivalent. Fuel feed line is
3/8
n
diameter and fuel return line is 5/16" diameter.
Do not use copper or aluminum tubing to replace steel
tubing. Those materials do not have satisfactory
durability to withstand normal vehicle vibration.
Coupled Hose - Not to be repaired, replace only as an
assembly.
Uncoupled Hose - Use only reinforced fuel resistant
hose made of "Fluroelastomer" material. Do not use
hose within 4 inches (100 mm) of any part of the
exhaust system or within 10 inches (254 mm) of the
catalytic converter.