For 1990-2009 cars only
- Remove the air intake duct.
- Inspect the throttle body bore and the throttle valve plate for deposits. If necessary, open the throttle valve to inspect all surfaces.
- Clean the throttle body bore and the throttle valve plate using a clean shop towel with an appropriate cleaning substance, such as one of the following:
- Install the air intake duct.
- Perform the Throttle Learn procedure. Refer to Throttle Learn .
Caution: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
Notice: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.
Notice: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.
| • | GM Top Engine Cleaner |
| • | P/N 1052626 (Canadian P/N 993026) |
| • | AC-Delco Carburetor Tune-Up Conditioner |
| • | P/N X66-P |
