For 1990-2009 cars only
- Remove the air cleaner outlet duct.
- Remove the air inlet screen, if applicable.
- Inspect the throttle body bore and the throttle valve plate for deposits. You must open the throttle valve in order to inspect all of the surfaces.
- Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 (Canadian P/N 993026) or an equivalent product.
- If the deposits are excessive, remove and disassemble the throttle body for cleaning. Refer to Throttle Body Assembly Replacement .
- If you removed and disassembled the throttle body for cleaning, assemble and install the throttle body. Refer to Throttle Body Assembly Replacement .
- Install the air inlet screen, if applicable.
- Install the air cleaner outlet duct.
After disassembly, clean the throttle body using a parts cleaning brush. DO NOT immerse the throttle body in any cleaning solvent.
