Procedures

Throttle Body Service

* Remove the air cleaner intake duct.
* Fully open the throttle valve in order to Inspect the throttle body bore and the throttle valve plate for any deposits.

Notice: Do not subject a throttle body assembly which contains the following components to an immersion cleaner or a strong solvent:

* Throttle position (TP) sensor

* Idle air control (IAC) valve

* Sealed throttle shaft bearings

The cleaners will damage the electric components or sensors.

The cleaners will damage some of these components that contain seals or O-rings.

Solvents can wash away or break down the grease used on non-serviceable throttle shaft bearings.

Never use a wire brush or scraper to clean the throttle body. A wire brush or sharp tools may damage the throttle body components.

Do not use a cleaner that contains methyl ethyl ketone. This extremely strong solvent may damage components and is not necessary for this type of cleaning.

Use a clean shop towel and Top Engine Cleaner GM P/N 1052626 or equivalent product in order to clean the throttle body bore and the throttle valve plate.

If necessary, use a parts cleaning brush in order to remove heavy deposits.

* Install the air cleaner duct.