Intake Manifold Replacement - Upper

Intake Manifold Replacement - Upper
Removal Procedure





1. Disconnect the negative battery cable.
2. Remove the intake manifold cover.
3. Drain the cooling system. Refer to Draining and Filling Cooling System (LS4 Static Fill) Draining and Filling Cooling System (LZE, LZ4, LZ9 Static Fill) Draining and Filling Cooling System (9C1, 9C3 Static Fill) Draining and Filling Cooling System (LS4 GE 47716 Fill) Draining and Filling Cooling System (LZE, LZ4, LZ9, 9C1, 9C3 GE 4771 Fill).
4. Remove the positive crankcase ventilation (PCV) fresh air tube.





5. Remove the PCV foul air tube.





6. Remove the vacuum hose from the intake manifold.





7. Reposition the heater inlet and outlet hose/pipe clamps at the engine pipes.
8. Remove the heater inlet and outlet hose/pipe clamp nuts from the throttle body studs.
9. Remove the heater inlet and outlet hoses/pipes from the engine pipes and the throttle body studs.
10. Reposition the hoses/pipes out of the way.





11. Disconnect the manifold absolute pressure (MAP) sensor electrical connector (1).





12. Disconnect the evaporative emission (EVAP) canister purge solenoid electrical connector (1).
13. Disconnect the chassis EVAP line quick connect fitting from the purge solenoid.
14. Disconnect the electronic throttle control (ETC) electrical connector (2).





15. Remove the air cleaner outlet duct.
16. Disconnect the left side spark plug wires from the spark plugs.
17. Disconnect the left side spark plug wires from the ignition coil.
18. Disengage the spark plug wire retainer clips from the intake manifold bracket and the heater inlet/outlet hose/pipe bracket.
19. Remove the left side spark plug wires.





20. Remove the throttle body bolts and nuts.
21. Remove the throttle body and gasket.





22. Remove the EVAP canister purge solenoid valve bolt.
23. Remove the EVAP canister purge solenoid valve.





24. Remove the MAP sensor bracket bolts.
25. Remove the MAP sensor bracket and sensor.





26. Remove the ignition coil bracket (to intake manifold) bolts.
27. Remove the intake manifold cover ball stud nut from the intake manifold stud.
28. Remove the upper intake manifold bolts and stud.
29. Separate and remove the upper intake manifold from the lower intake manifold.
30. Remove the upper to lower intake manifold gaskets.
31. Clean the upper intake to lower intake gasket mating surfaces.

Installation Procedure





1. Install NEW upper to lower intake manifold gaskets.
2. Install the upper intake manifold onto the lower intake manifold.
3. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the upper intake manifold bolts/stud threads.

4. Notice: Refer to Fastener Notice.

Install the upper intake manifold bolts and stud.
Tighten the bolts and stud to 25 Nm (18 ft. lbs.).
5. Install the intake manifold cover ball stud nut to the intake manifold stud.
Tighten the nut to 5 Nm (44 inch lbs.).
6. Install the ignition coil bracket (to intake manifold) bolts.
Tighten the bolts to 25 Nm (18 ft. lbs.).





7. Install the MAP sensor and bracket.
8. Install the MAP sensor bracket bolts.
Tighten the bolts to 25 Nm (18 ft. lbs.).





9. Install the EVAP canister purge solenoid valve.
10. Install the EVAP canister purge solenoid valve bolt.
Tighten the bolts to 16 Nm (12 ft. lbs.).





11. Inspect the throttle body seal for damage, replace as necessary.
12. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the throttle body bolts/studs threads.
13. Position the throttle body gasket and throttle body to the intake.
14. Install the throttle body bolts and nuts.
Tighten the bolts/studs to 10 Nm (89 inch lbs.).





15. Install the left side spark plug wires.
16. Engage the spark plug wire retainer clips to the intake manifold bracket and the heater inlet/outlet hose/pipe bracket.
17. Connect the left side spark plug wires to the ignition coil.
18. Connect the left side spark plug wires to the spark plugs.
19. Install the air cleaner outlet duct.





20. Connect the EVAP canister purge solenoid electrical connector (1).
21. Connect the chassis EVAP line quick connect fitting to the purge solenoid.
22. Connect the ETC electrical connector (2).





23. Connect the MAP sensor electrical connector (1).





24. Position the hoses/pipes.
25. Install the heater inlet and outlet hoses/pipes to the engine pipes and the throttle body studs.
26. Install the heater inlet and outlet hose/pipe clamp nuts to the throttle body studs.
Tighten the nuts to 10 Nm (89 inch lbs.).
27. Position the heater inlet and outlet hose/pipe clamps at the engine pipes.





28. Install the vacuum hose to the intake manifold.





29. Install the PCV foul air tube.





30. Install the PCV fresh air tube.
31. Fill the cooling system. Refer to Draining and Filling Cooling System (LS4 Static Fill) Draining and Filling Cooling System (LZE, LZ4, LZ9 Static Fill) Draining and Filling Cooling System (9C1, 9C3 Static Fill) Draining and Filling Cooling System (LS4 GE 47716 Fill) Draining and Filling Cooling System (LZE, LZ4, LZ9, 9C1, 9C3 GE 4771 Fill).
32. Connect the negative battery cable.
33. Install the intake manifold cover.