For 1990-2009 cars only
- Remove the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
- Inspect the throttle body bore and the throttle valve plate for deposits. It is necessary to open the throttle valve in order to inspect all surfaces.
- Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or ACDelco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
- Install the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
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.
