Idle Air Control Valve: Installation
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NOTE:
If you are installing a new IAC valve, replace the valve with an identical part. The IAC valve pintle shape and diameter are designed for the specific application.
Measure the distance A between tip of the IAC valve pintle and the mounting flange. If the distance is more than 1.10" (28 mm), use finger pressure in order 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 assembly. Install the engine cover. Reset the IAC valve pintle position. See IAC VALVE RESET PROCEDURE .
CAUTION:
DO NOT manually extend or retract pintle if IAC valve has been in service, or damage to worm gear will result.
NOTE:
Before installation, clean "O" ring sealing surface, pintle seat and air passage. If air passage has heavy deposits, remove throttle body for complete cleaning.
- Inspect "O" ring for damage. Replace as necessary. If reusing IAC valve, DO NOT push or pull on pintle. Threads on worm gear will be damaged.
- If replacing IAC valve, measure distance between tip of new IAC valve pintle and mounting flange. Distance should not exceed 1 1/8" (28 mm). See Fig 1. If distance is more than specified, use finger pressure to slowly retract pintle. Lubricate "O" ring with clean engine oil.
- Apply Thread Locking Compound (Loctite 262) to IAC valve retaining screw threads. Install IAC valve to throttle body. Tighten IAC valve retaining screws to specification. See TORQUE SPECIFICATIONS . Reconnect IAC valve harness connector.
- To reset IAC valve pintle position, turn ignition on for 20 seconds. Turn ignition off for 10 seconds. Start engine and check for proper idle operation. Repeat procedure if proper idle operation is not obtained.