Throttle Body: Service and Repair

Throttle Body Service

Removal Procedure




1. Disconnect the MAF sensor electrical connector.

Notice: Do not damage the MAF sensor screen. A damaged screen could restrict airflow and lead to a driveability concern.

2. Remove the MAF sensor bolts and intake air duct (2) as an assembly.

Throttle Body And Coolant Pipes:

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

Notice: 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 throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or equivalent product.

Installation Procedure

Notice: The outlet of the air cleaner assembly and the MAF sensor inlet duct must line up when completely installed. Misalignment may cause incorrect airflow readings resulting in MIL illumination or a driveability concern. An improperly installed inlet duct assembly or air cleaner assembly may cause misalignment.

Notice: Refer to Fastener Notice in Service Precautions.




1. Install the MAF sensor with three bolts and intake air duct (2) as an assembly.
Tighten the MAF sensor attaching bolts to 8 N.m (71 lb in).
2. Connect the MAF sensor electrical connector to the MAF sensor.