Cleaning and Inspection Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
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). 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. See THROTTLE BODY (CSI) . Inspect the IAC valve "O" ring for cuts, cracks, or distortion. Replace the "O" ring if damaged.