Procedures

Throttle Body Cleaning

1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Resonator Replacement Service and Repair.

Warning

Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

Caution:
Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.

2. Inspect the throttle body bore and throttle plate for deposits. You need to open the throttle plate in order to inspect all surfaces.

Caution:
Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

3. Clean the throttle body bore and the throttle plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 (Canadian P/N 993026), or ACDelco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.

4. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Resonator Replacement Service and Repair.

5. Perform the Throttle/Idle Learn procedure. Refer to Throttle/Idle Learn Testing and Inspection.