Throttle Body Cleaning

This service procedure is necessary when a DTC 85 has set, or when directed to do so by Chart C-2B or Diagnosis By Symptom.

REMOVE OR DISCONNECT
1. Air intake duct.

Inspect
Throttle body bore and throttle valve plate for deposits. It is necessary to open the throttle valve to inspect all surfaces.

Clean
Throttle body bore and throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, PIN X66-P, or equivalent product.

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

INSTALL OR CONNECT
1. Air intake duct.
2. Perform "TP SENSOR LEARN" procedure.
3. Perform "IDLE LEARN" procedure.