Trooper LS V6-3.5L (1998)
Idle Air Control Valve: Service and Repair
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the bolts and the IAC valve from the throttle body.
NOTE: Do not clean the IAC valve by soaking it in solvent. The valve will be damaged as a result.
Cleaning, Inspection, and Measurement Procedure
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Clean the IAC valve O-ring sealing surface, pintle valve seat and air passage.
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Use carburetor cleaner and a parts cleaning brush to remove carbon deposits. Do not use a cleaner that contains methyl ethyl ketone. This is an
extremely strong solvent and not necessary for this type of deposit.
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Shiny spots on the pintle are normal and do not indicate misalignment or a bent pintle shaft.
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If the air passage has heavy deposits, remove the throttle body for complete cleaning.
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Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if damaged.
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In order to install a new IAC valve, measure the distance between the tip of the pintle and the mounting flange. If that measurement is 28 mm (1.1
in.) or less, the valve needs no adjustment. If the measurement is greater than 28 mm (1.1 in.), apply finger pressure and retract the valve. The
force required to retract the pintle on a new valve will not damage the valve, shaft, or pintle.
NOTE: Do not push or pull on the AC valve pintle on IAC valves that have been in service. The force required to move the pintle may damage it.
IMP0RTANT: Use an identical replacement part in order to replace a valve. IAC valve pintle shape and diameter are designed for the specific
application.
Installation Procedure
1. Install the AC valve on the throttle body with the bolts.
Tighten: Tighten the bolts to 1 N.m (9 lb in.).
2. Connect the IAC valve electrical connector.
3. Install the negative battery cable.
