Throttle Body: Service and Repair

CLEANING PROCEDURE

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 damaged 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.





Clean the throttle body bore and the throttle plate on the vehicle using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, P/N X66P, or equivalent. Remove and disassemble the throttle body for cleaning if the deposits are excessive. Refer to IAC Valve Replacement for IAC valve removal and TP Sensor Replacement for TP sensor removal. After disassembly, clean the throttle body using a parts cleaner brush. DO NOT immerse the throttle body in any cleaning solvent.

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Remove the air cleaner outlet duct.
4. Remove the air cleaner outlet adapter stud.




5. Remove the cruise control cable.




6. Remove the accelerator cable.




7. Remove the stud and nuts retaining the accelerator control cable bracket and position bracket aside.




8. Disconnect the IAC valve harness connector.




9. Disconnect the TP sensor harness connector.




10. Remove the throttle body retaining studs.




11. Remove the throttle body assembly.
12. Discard the throttle body seal.

INSTALLATION PROCEDURE




1. Clean the gasket surface on the intake manifold.
2. Install the throttle body assembly with a new seal.





NOTE: Refer to Fastener Notice in Service Precautions.

3. Install the throttle body assembly retaining studs.

Tighten
Tighten the studs to 9 N.m (80 lb in).




4. Install air cleaner outlet duct adapter stud.

Tighten
Tighten the fasteners to 8 N.m (72 lb in).




5. Connect the TP sensor harness connector.




6. Connect the IAC valve harness connector.




7. Install the accelerator control cable bracket using mounting fasteners.

Tighten
Tighten the fasteners to 12 N.m (108 lb in).





IMPORTANT: Make sure the accelerator and the cruise control cables do not hold the throttle open.

8. Install the accelerator cable.




9. Install the cruise control cable.
10. Install the air cleaner outlet tube.
11. Install the engine cover.
12. Connect the negative battery cable.

IMPORTANT: The accelerator pedal should operate freely without binding between full and closed throttle.

13. Check the accelerator pedal operation.
13.1. Depress the pedal to the floor.
13.2. Release the accelerator pedal.