Pontiac Fiero 1988 Service Manual page 543

6E2-C2-12 DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI)
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THROTTLE BODY A S S E M B L Y
fil T P S A T T A C H I N G S C R E W & W A S H E R A S S E M B L Y
PTI
T H R O T T L E P O S I T I O N S E N S O R
fTI T U B E M O D U L E A S S E M B L Y G A S K E T
T U B E M O D U L E A S S E M B L Y
T U B E M O D U L E A T T A C H I N G S C R E W A S S E M B L Y
fT] I A C V A L V E A T T A C H I N G S C R E W
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I D L E AIR C O N T R O L V A L V E
[ 9 | i O L E STOP S C R E W P L U G
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I D L E S T O P S C R E W & W A S H E R A S S E M B L Y
11
I D L E S T O P S C R E W S P R I N G
[T] T H R O T T L E L E V E R
B
T H R O T T L E B O R E
8P 0919-AS
1/15/87
Figure C2-17 - Throttle Body Assembly
THROTTLE BODY ASSEMBLY
Replacement (Figure C2-17)
NOTICE:
Procedures related to replacement of the
individual components below have been
described previously and should be
followed, or damage could occur.
Remove or Disconnect
1. Throttle body injection (TBI) unit, as described
below.
2. Fuel meter body-to-throttle body attaching screw
and washer assemblies.
3. Fuel meter assembly.
4. Fuel meter body to throttle body gasket and
discard.
Disassemble
• TPS, IAC valve and tube module assembly from
old throttle body assembly, according to previous
instructions.
jnjfr] Assemble
• TPS, IAC valve, and tube module assembly onto
replacement throttle body assembly, according to
previous instructions.
PH
IDLE
STOP
SCREW
A S S E M B L Y
PH I D L E S T O P S C R E W P L U G
8P 0920-AS
Figure C2-18- Removing Idle Stop Screw Plug
Install or Connect
1. New fuel meter body to throttle body gasket.
2. Fuel meter assembly on throttle body assembly.
3. Fuel meter body-to-throttle body attaching screw
and washer assemblies.
| ^ | Tighten
• Screws to 6.0 N.m (53 lb. in.).
4. TBI unit onto engine, as described below.
5. Check minimum idle speed of engine as described
below.
MINIMUM IDLE SPEED CHECK
The idle stop screw, used in mechanically setting
minimum engine idle speed has been set at the factory
and should not require further adjustment. However,
to check that the setting is correct, proceed as follows:
1. Plug any vacuum ports, as required.
2. If present, remove idle stop screw plug by piercing
it with an awl, then applying leverage (see Figure
C2-18).
3. Connect tachometer to engine.
4. With IAC valve connected, ground the diagnostic
terminal (ALDL connector).
5. Turn "ON" ignition, do not start engine. Wait at
least 45 seconds (this allows IAC valve pintle to
extend and seat in throttle body).
6. With ignition "ON," engine stopped, test terminal
still grounded, disconnect IAC valve electrical
connector.
7. Remove ground from diagnostic terminal and
"start" engine. With transmission in neutral,
allow engine rpm to stabilize.
8. The tachometer should read 600, ± 50 rpm. If not,
adjust the idle stop speed screw accordingly.