Idle Up Control Valve: Service and Repair

Idle Air Control Valve:

Removal
1. Disconnect electrical connector.
2. Remove IAC valve attaching screws.
3. Remove IAC valve assembly.

NOTICE: If 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 IAC valve in any liquid cleaner or solvent, as damage may result.

Clean and Inspect

^ Clean IAC valve O-ring sealing surface, pintle valve seat, and air passage.
- Use carburetor cleaner and a parts cleaning brush to remove carbon deposits. Do Not use a cleaner containing methyl ethyl ketone, an extremely strong solvent, and not necessary for this type of deposit.
- Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
- If air passage has heavy deposits, remove upper manifold assembly for complete cleaning.
^ Inspect IAC valve O-ring for cuts, cracks, or distortion. Replace as damaged.

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

Measure (Only if installing a New IAC Valve)
^ Distance between tip of IAC valve pintle and mounting flange (reference "A" in figure).
- 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.

Installation
1. Lubricate IAC valve O-ring with clean engine oil.
2. Install IAC valve assembly.
3. Install Attaching screws coated with appropriate thread-locking material.
4. Reconnect electrical connector.
5. Reset IAC valve pintle position:
A. Disconnect negative battery cable for at least ten seconds to clear PCM memory.
B. Reconnect negative battery cable.
C. Start engine and check for proper idle operation.