Removal & Installation
- Disconnect the IAC valve electrical connector.
- Remove the IAC valve attaching screws.
- Remove the IAC valve.
Remove the IAC valve O-ring seal.
NOTEIf the IAC valve has been in service: DO NOT push or pull on the IAC valve pintle. The force required to move the pintle may damage the threads on the worm drive. Also, DO NOT soak the IAC valve in any liquid cleaner or solvent, as damage may result.
- Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
- Clean the IAC valve using GM cleaner 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.
- Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if it is damaged.
- Measure the distance between the tip of the IAC valve pintle and the mounting surface. If the distance is more 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.
- Lubricate the IAC valve O-ring with clean engine oil.
- Install the IAC valve O-ring on the IAC valve.
- Install the IAC valve.
- Apply Loctite 262 to the IAC valve attaching screw threads if necessary.
- Install the IAC valve attaching screws and tighten to 3 Nm (27 inch lbs.).
- Connect the IAC valve electrical connector.
- Perform the Idle Learn Procedure. See Idle Learn Procedure.