Throttle Body: Service and Repair

NOTE: 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 or 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.

CLEANING PROCEDURE
Clean the throttle body bore and throttle valve plate on the vehicle using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or A/C Delco Carburetor Tune-up Conditioner, P/N X66P or equivalent. Remove and disassemble the throttle body for cleaning if the deposits are excessive. After disassembly, clean the throttle body using a parts cleaning brush. DO NOT immerse the throttle body in any cleaning solvent. An 8-digit part identification number is stamped on the bottom of the throttle body casting. Refer to this number when servicing or part replacement is necessary.

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.
2. Remove the air inlet duct fastener and duct.
3. Disconnect the IAC valve and TP sensor electrical connectors.
4. Disconnect the throttle, and cruise control cables.
5. Remove the accelerator cable bracket bolts and bracket.




6. Remove the wiring harness fastener nut and throttle body retaining studs




7. Remove the throttle body assembly.




8. Remove the flange gasket and discard.
9. Clean the gasket surface of the intake manifold.

INSTALLATION PROCEDURE




1. Install the new flange gasket.




2. Install the throttle body assembly.




3. Install the throttle body retaining studs and wiring harness fastener and nuts.

Tighten
Tighten to 25 N.m (18 lb ft).

NOTE: Refer to Fastener Notice in Service Precautions.

4. Connect the throttle and cruise control cables.
5. Install the accelerator cable bracket and bolts.
6. Connect the IAC valve and TP sensor electrical connectors.




7. Install the air inlet duct and retaining nut.

Tighten
Tighten the nut to 2 N.m (18 lb in).

8. Connect the negative battery cable.
9. With the engine OFF, check to see that the accelerator pedal is tree. Depress the pedal to the floor and release.