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Home >> Chevrolet >> 2004 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.3L - Introduction >> Repair Instructions >> Idle Air Control (IAC) Valve Replacement >> Cleaning and Inspection Procedure

Cleaning and Inspection Procedure

  1. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
    • Use a carburetor cleaner and a parts cleaning brush in order to remove any carbon deposits. Follow the instructions on the container.
    • Do not use a cleaner that contains methyl ethyl ketone. MEK is 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 the air passage has heavy deposits, remove the throttle body for a complete cleaning. Refer to Throttle Body Assembly Replacement  and to Throttle Body Cleaning Procedure .
  2. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if damaged.
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