Throttle Body Replacement

CAUTION: Place a dry chemical (Class B) fire extinguisher near work area before attempting any On-Vehicle Service.

Important: Collect any escaping coolant from the throttle body hoses. Drain the coolant to a sufficient level or collect coolant as necessary.

REMOVAL

1. Loosen the hose clamps at the throttle body inlets.
2. Disconnect the air ducts from the throttle body.
3. Loosen the hose clamp.
4. Disconnect the air hose for the IAC valve.
5. Remove the accelerator cable.
6. Disconnect the Cruise control cable.
7. Loosen the hose clamps
8. Disconnect the coolant hose from the throttle body.
9. Disconnect the TP sensor harness connector.
10. Disconnect the Brake servo vacuum line.
11. Remove the bolt cover caps from the intake plenum.
12. Remove the fastening bolts for the intake plenum.

Important: Mask the intake ducts. Entry of foreign objects can cause severe engine damage.

13. Carefully pull the intake plenum upwards. Observe the seal rings between the intake plenum and the intake bridge.
14. Remove the throttle body to intake fastening bolts.
15. Remove the throttle body from the intake plenum.
16. Observe the seal rings for the throttle body and the seal rings for the vent adaptor.

INSTALLATION
Use new seal rings for throttle body and for engine vent adaptor.

1. Install the throttle body to the intake plenum - ensure correct sealing.
2. Place 6 new seals on the intake bridge. Ensure that the installation positions are correct.

Important: The intake bridge has two guide pins for aligning the intake plenum.

3. Install the intake plenum on the intake bridge. Ensure the correct sealing.
4. Install/tighten the bolts for the intake plenum.
5. Reinstall the bolt cover caps.
6. Connect the Brake servo vacuum line.
7. Connect the Cruise control cable (2) and the accelerator cable (1).
8. Ensure that the air ducts are properly positioned on the throttle body inlets.
9. Tighten the hose clamps.
10. Connect the IAC valve air hose.
11. Tighten the hose clamp.
12. Connect the TP sensor electrical connector.
13. Connect the negative battery cable.
14. Check and add the coolant as necessary. A long life coolant must meet GM Specification 6277-M.