Idle Speed/Throttle Actuator - Electronic: Service and Repair

IDLE AIR CONTROL (IAC) VALVE REPLACEMENT

REMOVAL PROCEDURE
1. Remove the generator.




2. Disconnect the idle air control (IAC) valve electrical connector.




3. Remove the IAC valve attaching screws (4).
4. Remove the IAC valve (3).
5. Remove the IAC valve O-ring seal (2).
6. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
- Clean the IAC valve using GM cleaner P/N 1052626 or GM X-66A. Use a shop towel or parts brush to remove heavy deposits.
- If the air passage has heavy deposits, remove the throttle body for complete cleaning.
- Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.

NOTE:
- Do Not push or pull on the IAC valve pintle on IAC valves that have been in service. The force required to move the pintle may damage the threads on the worm drive.
- Do Not soak the IAC valve in any liquid cleaner or solvent, as damage may result.

7. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if the O-ring is damaged.

INSTALLATION PROCEDURE




1. Measure the distance between the tip of the IAC valve pintle and the mounting surface (1). If the distance is more than 28 mm (1.1 in) use finger pressure to slowly retract the pintle. The force required to retract the pintle of a new valve does not cause damage to the valve.

IMPORTANT: If installing a new IAC valve, be sure to replace the IAC valve with an identical part. The pintle shape of the IAC valve and the diameter of the IAC valve are designed for the specific application.




2. Lubricate the IAC valve O-ring (2) with clean engine oil.
3. Install the IAC valve O-ring (2) on the IAC valve (3).
4. Install the IAC valve (3).
5. Apply LOCTITE 262 to the IAC valve attaching screw threads if necessary.

NOTE: Refer to Fastener Notice in Service Precautions.

6. Install the IAC valve attaching screws (4).

Tighten the screws to 3 N.m (27 lb in).




7. Connect the IAC valve electrical connector.
8. Install the generator.