Idle Air Control (IAC) Valve Replacement

Idle Air Control (IAC) Valve:

REMOVE OR DISCONNECT
1. Electrical connector.
2. Idle Air Control (IAC) valve attaching screws.
3. IAC valve assembly.

CAUTION: 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 0-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 that contains 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 0-ring for cuts, cracks or distortion. Replace if damaged.

NOTE: When installing a new IAC valve, replace with an identical part. IAC valve pintle shape and diameter are designed for the specific applications.

Measure
^ 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.

INSTALL OR CONNECT
1. Lubricate IAC valve 0-ring with clean engine oil.
2. IAC valve assembly.
3. Attaching screws.

Thread-locking Material
The hardware used to attach the Idle Air Control (IAC) valve are coated with thread-locking adhesive. If any of these parts are removed for service, inspect the attaching screw threads. There should be enough thread-locking material (adhesive or compound) on the threads to insure proper relocking. If not, clean the screw threads and apply Loctite 262, or equivalent, to the threads before reassembly. Replacement screws are included in the service screw assortment package. New attaching hardware is included in the service packages.

Tighten
^ IAC valve attaching screws to 3.0 Nm (27 lb. in.).

4. Electrical connector.
5. Reset IAC valve pintle position:

^ Disconnect battery cable for 10 seconds then reconnect battery cable.
^ Turn ignition "ON," engine "OFF" for five seconds.
^ Turn ignition "OFF" for ten seconds.
^ Start engine and check for proper idle operation.