Removal Procedure
- Disconnect the idle air
control (IAC) valve electrical connector.
- Remove the IAC valve attaching
screws (4).
- Remove the IAC valve (3).
- Remove the IAC valve O-ring seal (2).
Notice:
ā¢ | Do Not push or pull on the IAC valve pintle on IAC valves that
have been in service. The force required to move the pintle may damage the
threads on the worm drive. |
ā¢ | 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.
ā¢ | Clean the IAC valve using GM cleaner P/N 1052626 or GM X-66A.
Use a shop towel or parts brush to remove heavy deposits. |
ā¢ | If the air passage has heavy deposits, remove the throttle body
for complete cleaning. |
ā¢ | 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 the O-ring is damaged.
Installation Procedure
Important: If installing a new IAC valve, be sure to replace the IAC valve with
an identical part. The pintle shape of the IAC valve and the diameter of
the IAC valve are designed for the specific application.
- Measure the distance between the tip of the IAC valve pintle and the
mounting surface (1). If the distance is more than 28 mm (1.1 in)
use finger pressure to slowly retract the pintle. The force
required to retract the pintle of a new valve does not cause
damage to the valve.
- Lubricate the IAC valve
O-ring (2) with clean engine oil.
- Install the IAC valve O-ring (2) on the IAC valve (3).
- Install the IAC valve (3).
- Apply Loctite 262 to the IAC valve attaching screw threads if
necessary.
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.
- Install the IAC valve attaching screws (4).
Tighten
Tighten the screws to 3 NĀ·m (27 lb in)
- Connect the IAC valve
electrical connector.
- Perform the Idle Learn Procedure. Refer to PCM Idle Learn Procedure
.