Throttle Body Cleaning
- Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
- Inspect the throttle body bore and the throttle valve plate for deposits. You will need 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, GM P/N 1052626 (Canadian P/N 993026) or ACDelco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.
- Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
- Perform the throttle relearn procedure. Refer to Q38 Throttle Body: Throttle/Idle Learn .
NOTE:
Over extended time and mileage, deposits may accumulate on the back of the throttle valve plate. Typically these deposits pose no problem. Occasionally the deposit may accumulate to a point where perceived pedal effort or throttle valve movement is effected. This procedure should not be performed on vehicles with mileage under 80 450 km (50, 00 mi).
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.
CAUTION:
Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.