Idle Air Control Valve Replacement RPO L35

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.



2. Disconnect the IAC valve harness connector.



3. Remove the IAC valve attaching fasteners.

Notice: If 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.




4. Remove the IAC valve assembly.
5. Remove the O-ring.

1. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.

•	Use the carburetor cleaner and a parts cleaning brush in order to remove carbon deposits. Follow instructions on the container.

•	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. They do not indicate misalignment or a bent pintle shaft.

•	If air passage has heavy deposits, remove the throttle body for a complete cleaning. Refer to Throttle Body Assembly Replacement .

2. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace if damaged.

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

1. Measure the distance A between tip of IAC valve pintle and mounting flange.

If greater than 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.




2. Lubricate the IAC valve O-ring with clean engine oil.
3. Install the IAC valve assembly.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the IAC valve attaching fasteners.

Tighten
Tighten the IAC valve attaching fasteners to 3.0 N·m (26 lb in).




5. Connect the IAC valve harness connector.
6. Connect negative battery cable.
7. Perform the following steps to reset the IAC valve pintle position:

1. Turn ON the ignition for 20 seconds.
2. Turn OFF the ignition for 10 seconds.
3. Start the engine.
4. Check for the proper idle speed.

Idle Air Control Valve Replacement RPO LB4

1. Remove the electrical connector.
2. Remove the IAC valve attaching screws (2).
3. Remove the IAC valve assembly.

1. Lubricate the IAC valve O-ring (3) with clean engine oil.
2. Install the IAC valve assembly.
3. Install the attaching screws.

Tighten
Tighten the IAC valve attaching screws to 3.0 N·m (27 lb in).

4. Install the electrical connector.
5. Reset the IAC valve pintle position:

•	Disconnect the battery cable for 10 seconds then reconnect the battery cable.

•	Turn ignition "ON," engine "OFF" for 5 seconds.

•	Turn ignition "OFF" for 10 seconds.

•	Start the engine and check for proper idle operation.