Throttle Body Service

REMOVAL PROCEDURE




1. Disconnect the mass air flow/intake air temperature (MAF/IAT) sensor electrical connector.

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

2. Loosen the intake air duct clamps.
3. Remove the mass air flow (MAF) sensor and air cleaner intake duct (2) as an assembly.




4. Inspect the throttle body bore (1) and throttle valve plate for deposits. It is necessary to open the throttle valve to inspect all surfaces.

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

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

INSTALLATION PROCEDURE

NOTE:
^ 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.
^ Refer to Fastener Notice in Service Precautions.




1. Install the MAF sensor and air cleaner intake duct (2) as an assembly.
2. Tighten the intake air duct clamps.

Tighten
Tighten the intake air duct clamps to 3 N.m (27 lb in).

3. Connect the MAF sensor electrical connector to the MAF sensor.