64. Intake Manifold Cleaning and Inspection - Upper

Intake Manifold Cleaning and Inspection - Upper





1. Remove the throttle body bolts and nuts.
2. Remove the throttle body.
3. Remove the throttle body studs, if required.
4. Remove the manifold absolute pressure (MAP) sensor (1).
5. Remove the evaporative emissions (EVAP) purge valve bolt (2).
6. Remove the EVAP purge valve (3).





7. Important: If at any time the intake manifold tuning valve blade becomes separated from the actuator, DO NOT cycle the actuator. Cycling the actuator without the blade attached will offset the calibration, and the entire intake manifold tuning valve assembly will need to be replaced.

Remove the intake manifold tuning valve bolts.
8. Remove the intake manifold tuning valve.

9. Caution: Bodily injury may occur if the cleaning solvent is inhaled or exposed to the skin.

Clean the intake manifold with solvent.
10. Dry the intake manifold with compressed air.
11. Inspect all gasket mating surfaces for nicks or cracks and replace if necessary.





12. Inspect the intake manifold tuning valve seal for damage. Inspect the intake manifold tuning valve blade for cracks, missing material, or looseness. The tuning valve blade attachment to the motor should be tight, with no slack present. Replace if necessary.





13. Apply lubricant GM P/N 1051344 (Canadian P/N 993037) to the valve shift (1).





14. Install the intake manifold tuning valve, ensuring proper alignment is achieved. Failure to do so may result in the valve getting jammed or stuck in the intake manifold.

15. Notice: Refer to Fastener Notice in Service Precautions.

Install the intake manifold tuning valve bolts.
Tighten the intake manifold tuning valve bolts to 10 Nm (89 inch lbs.).





16. Inspect the EVAP purge valve seal for damage and replace if necessary.
17. Install the EVAP purge valve (3).
18. Install the EVAP purge valve bolt (2).
Tighten the EVAP purge valve bolt to 16 Nm (12 ft. lbs.).
19. Inspect the MAP sensor seal for damage and replace if necessary.
20. Install the MAP sensor (1).
21. Install the throttle body studs, if required.
Tighten the throttle body studs to 6 Nm (53 inch lbs.).
22. Inspect the throttle body seal for damage and replace if necessary.
23. Install the throttle body.
24. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) to the throttle body bolt and nut threads.
25. Install the throttle body bolts and nuts.
Tighten the throttle body bolts and nuts to 10 Nm (89 inch lbs.).