Throttle Body Inspection and Cleaning

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.

  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  2. Disconnect the electrical connector.

    3. 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.

  3. 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.

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

  4. Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner. Refer to Adhesives, Fluids, Lubricants, and Sealers.
  5. Connect the electrical connector.
  6. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  7. Perform the diagnostic repair verification. Diagnostic Repair Verification
  8. Perform the Throttle/Idle Learn procedure. Refer to Throttle or Idle Learn.