Throttle Body Service

REMOVAL PROCEDURE

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

MAF Sensor:

1. Remove the MAF sensor bolts and intake air duct as an assembly.

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

Throttle Body And Coolant Pipes:

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

NOTE: The outlet of the air cleaner assembly and the MAF sensor inlet duct must tine 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.

MAF Sensor:

1. Install the MAF sensor and intake air duct as an assembly.

NOTE: Refer to the Fastener Notice in Service Precautions.

2. Install the MAF sensor bolts.

Tighten
Tighten the MAF sensor attaching bolts to 8 N.m (71 lb in).