Idle Speed/Throttle Actuator - Electronic: Service and Repair

IDLE AIR CONTROL VALVE REPLACEMENT

REMOVAL PROCEDURE




1. Remove the air cleaner outlet resonator.
2. Disconnect the idle air control (IAC) valve electrical connector (2).




3. Remove the IAC valve screws.




4. Remove the IAC valve and O-ring seal.

Cleaning and Inspection Procedure

Clean the IAC valve O-ring sealing surface, pintle valve seat, and air passage.
- Remove any excess carbon deposits with a small amount of carburetor cleaner on a parts cleaning brush. Follow any instructions on the cleaner container regarding cleaner usage.
- Do not use a cleaner containing an extremely powerful solvent such as methyl ethyl ketone.
- Shiny spots on the pintle and seat do not represent a bent or misaligned pintle shaft.
- If heavy deposits are present in the air passage, remove the throttle body for a complete cleaning.

INSTALLATION PROCEDURE




1. If installing a NEW IAC valve, measure the distance between the IAC valve pintle and the mounting flange. If the distance is more than 28 mm (1.10 in), use finger pressure, and gently push in the pintle.




2. Install a NEW IAC valve O-ring seal.
3. Lubricate the IAC valve O-ring seal with clean engine oil.
4. Install the IAC valve and O-ring seal.




5. If installing the old IAC valve, clean the old thread locking material from the screws.
6. If installing the old IAC valve coat the screw threads with threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent.

NOTE: Refer to Fastener Notice.

7. Install the IAC valve screws.

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




8. Connect the IAC valve electrical connector (2).
9. Install the air cleaner outlet resonator.
10. Perform the IAC reset procedure:
1. Turn the ignition to the ON position, wait for 5 seconds.
2. Turn the ignition to the OFF position, wait for 10 seconds.
3. Start the engine and check for proper idle speed.