G 1500 1/2 Ton Van V8-305 5.0L VIN H TBI (1995)
Idle Speed/Throttle Actuator - Electronic: Service and Repair
With TBI Model 220
IAC Valve
CAUTION: The IAC valve is an electrical component and must not be soaked in any liquid cleaner or solvent. Otherwise damage could result. Any
replacement of an IAC valve must have the correct part number, with the appropriate pintle taper and diameter for proper seating of the valve in the
throttle body.
REMOVE OR DISCONNECT
1. Electrical connector.
2. IAC valve, use a 32 mm (1-1/4") wrench
3. IAC valve gasket or O-ring and discard.
Clean
Old gasket material from surface of throttle body assembly to insure proper seal of new gasket.
NOTE: If the IAC valve was removed during service, its operation may be tested electrically with the IAC system analyzer (J 37027 or BT-
8256K). However, if the valve pintle is extended electrically, it must also be retracted electrically. Before installing an IAC valve, measure the
distance between the tip of the valve pintle and the mounting surface. If the dimension is greater than 28 mm (1.10"), it must be reduced to prevent
damage to the valve. This may be done electrically using on IAC system analyzer motor tester (J 37027 or BT-8256K).
Measure
Distance between tip of IAC valve pintle and mounting flange.
-
If greater than 28 mm, use finger pressure to slowly retract the pintle. The force required to retract the pintle of a new valve will not cause
damage to the valve.
NOTE: No physical adjustment of the IAC valve assembly is required after installation. The IAC valve pintle is reset by the control module
system which causes the valve pintle to seat in the throttle body.
The control module then has a reset procedure to set the correct pintle position. Proper idle regulation should result.
INSTALL OR CONNECT
1. IAC valve into throttle body with new gasket.
Tighten
IAC valve assembly to 18.0 Nm (13.0 lb. ft.) with 32 mm (1-1/4") wrench.
2. Electrical connector to IAC valve.
3. Reset IAC valve pintle position:
-
Remove battery cable for 10 seconds.
-
Ignition "ON," engine "OFF" for 5 seconds.
-
Ignition "OFF," for 10 seconds.
