Upper Intake Manifold Replacement
Intake Manifold Replacement - UpperRemoval Procedure
Important: You do not have to remove the upper intake manifold in order to remove the lower intake manifold.
1. Remove the engine cover.
2. Remove the air cleaner assembly.
3. Remove the coolant reservoir bolt and set the reservoir aside.
4. Disconnect the positive crankcase ventilation (PCV) tube from the air cleaner outlet duct.
5. Remove the retaining nut (1) from the air cleaner outlet.
6. Remove the air cleaner outlet duct (2) from the throttle body assembly.
7. Disconnect the accelerator control cable from the throttle shaft and the accelerator control cable bracket.
8. Disconnect the cruise control cable, if equipped, from the throttle shaft and the accelerator control cable bracket.
9. Remove the PCV valve hose assembly from the intake manifold and the valve rocker arm cover.
10. Disconnect the following electrical connectors:
^ The fuel meter body assembly connector (1)
^ The EVAP canister purge solenoid valve (2)
^ The manifold absolute pressure (MAP) sensor (3)
11. Disconnect the following electrical connectors:
^ The throttle position (TP) sensor (1)
^ The idle air control (IAC) motor (2)
^ The engine coolant temperature (ECT) gage sensor (3)
^ The A/C high pressure switch (4), if equipped
12. Remove the engine wiring harness bracket from the intake manifold stud.
13. Move and secure the engine wiring harness out of the way.
14. Disconnect the A/C vacuum hose from the intake manifold.
15. Remove the power brake booster vacuum hose bracket and nut from the intake manifold stud.
16. Disconnect the power brake booster vacuum hose from the intake manifold.
17. Remove the accelerator control cable bracket from the throttle body and the intake manifold.
18. Remove the EVAP canister purge solenoid.
19. Remove the fuel lines from the fuel meter body assembly.
20. Remove the distributor cap.
21. Remove the ignition control module.
22. Remove the studs for the upper intake manifold.
23. Remove the upper intake manifold.
24. Remove the upper intake manifold gasket from the groove.
25. Discard the gasket.
26. Remove the seal from the fuel meter body assembly.
27. Discard the seal.
Important: Do not immerse the assembled upper intake manifold in cleaning solvent.
28. Clean all sealing surfaces and the inside of the upper intake manifold with a shop towel and cleaning solvent.
29. Inspect the upper intake manifold for the following:
^ Cracks or other damage to the exterior
^ Cracking or damage to the gasket grooves
^ Loose or damaged bolt hole thread inserts
30. If replacing the upper intake manifold, turn and remove the power brake booster vacuum tube fitting from the upper intake manifold.
31. Remove and discard the seal.
32. If replacing the upper intake manifold, turn and remove the PCV valve cover from the upper intake manifold.
33. Remove and discard the seal.
34. Remove the throttle body if replacing the upper intake manifold.
35. Remove the MAP sensor if replacing the upper intake manifold.
Installation Procedure
1. Install the throttle body, if removed.
2. Install the MAP sensor, if removed.
3. Install the PCV valve cover, if removed. using the following procedure:
3.1. Install a NEW seal (O-ring) on the PCV valve cover.
3.2. Lubricate the seal with clean engine oil.
3.3. Install the PCV valve cover in the upper intake manifold.
3.4. Turn and lock the PCV valve cover in position.
4. Install the power brake booster vacuum tube fitting, if removed, using the following procedure:
4. Install a NEW seal (O-ring) on the power brake booster vacuum tube fitting.
4.2. Lubricate the seal with clean engine oil.
4.3. Install the power brake booster vacuum tube fitting in the upper intake manifold.
4.4. Turn and lock the power brake booster vacuum tube fitting In position.
5. Install a NEW seal on the fuel meter bodily assembly.
6. Lubricate the seal with clean engine oil.
7. Install a NEW upper intake manifold to lower intake manifold gasket in the groove of the upper intake manifold.
8. Install the upper intake manifold onto the lower intake manifold.
9. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the upper intake manifold attaching bolts.
Notice: Refer to Fastener Notice in Service Precautions.
10. Install the upper intake manifold attaching studs.
10.1. Tighten the upper intake manifold attaching studs on the first pass to 5 Nm (44 inch lbs.).
10.2. Tighten the upper intake manifold attaching studs on the final pass to 9 Nm (80 inch lbs.).
11. Install the fuel lines to the fuel meter body assembly.
12. Install the distributor cap.
13. Install the ignition control module.
14. Install the EVAP canister purge solenoid valve.
15. Install the accelerator control cable bracket, studs, and nuts to the intake manifold and the throttle body.
^ Tighten the accelerator control cable bracket nuts and studs to 12 Nm (106 inch lbs.).
16. Connect the A/C vacuum hose to the intake manifold.
17. Install the power brake booster vacuum hose bracket and nut to the intake manifold stud.
^ Tighten the power brake booster vacuum hose bracket nut to 11 Nm (97 inch lbs.).
18. Connect the power brake booster vacuum hose to the Intake manifold.
19. Install the bracket for the engine wiring harness on the lower intake manifold stud.
20. Install the engine wiring harness bracket nut.
^ Tighten the engine wiring harness bracket nut to 12 Nm (106 inch lbs.).
21. Connect the following electrical connectors:
^ The fuel meter body assembly connector (1)
^ The EVAP canister purge solenoid valve (2)
^ The manifold absolute pressure (MAP) sensor (3)
22. Connect the following electrical connectors:
^ The throttle position (TP) sensor (1)
^ The idle air control (IAC) motor (2)
^ The engine coolant temperature (ECT) gage sensor (3)
^ The A/C high pressure switch (4), if equipped
23. Connect the PCV valve hose assembly to the intake manifold and the valve rocker arm cover.
24. Install the cruise control cable, if equipped to the throttle shaft and the accelerator control cable bracket.
25. Install the accelerator control cable to the throttle shaft and the accelerator control cable bracket.
26. Install the air cleaner outlet duct (2) on the throttle body assembly.
27. Tighten the retaining nut.
^ Tighten the nut to 2 Nm (18 inch lbs.).
28. Connect the PCV tube to the air cleaner outlet duct.
29. Position the coolant reservoir. install this bolt.
^ Tighten the bolt to 11 Nm (97 inch lbs.).
30. Install the air cleaner.
31. Install the engine cover.