GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: You do not have to remove the upper intake manifold in order to remove the lower intake manifold.


    Object Number: 183399  Size: SH
  1. Remove the engine cover. Refer to Engine Cover Replacement .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  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. Object Number: 35885  Size: SH
  6. Remove the retaining nut (1) from the air cleaner outlet .
  7. Remove the air cleaner outlet duct (2) from the throttle body assembly.
  8. Disconnect the accelerator control cable from the throttle shaft and the accelerator control cable bracket. Refer to Accelerator Control Cable Replacement .
  9. Disconnect the cruise control cable, if equipped, from the throttle shaft and the accelerator control cable bracket. Refer to Cruise Control Cable Replacement .

  10. Object Number: 172995  Size: SH
  11. Remove the PCV valve hose assembly from the intake manifold and the valve rocker arm cover.

  12. Object Number: 532770  Size: SH
  13. Disconnect the following electrical connectors:
  14. • The fuel meter body assembly connector (1)
    • The EVAP canister purge solenoid valve (2)
    • The manifold absolute pressure (MAP) sensor (3)

    Object Number: 532760  Size: SH
  15. Disconnect the following electrical connectors:
  16. • 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

    Object Number: 339442  Size: SH
  17. Remove the engine wiring harness bracket from the intake manifold stud.
  18. Move and secure the engine wiring harness out of the way.

  19. Object Number: 374900  Size: SH
  20. Disconnect the A/C vacuum hose from the intake manifold.
  21. Remove the power brake booster vacuum hose bracket and nut from the intake manifold stud.
  22. Disconnect the power brake booster vacuum hose from the intake manifold.

  23. Object Number: 398027  Size: SH
  24. Remove the accelerator control cable bracket from the throttle body and the intake manifold.
  25. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
  26. Remove the fuel lines from the fuel meter body assembly. Refer to Fuel Hose/Pipes Replacement - Engine Compartment .
  27. Remove the distributor cap. Refer to Distributor Replacement .
  28. Remove the ignition control module. Refer to Ignition Control Module Replacement .

  29. Object Number: 516794  Size: SH
  30. Remove the studs for the upper intake manifold.
  31. Remove the upper intake manifold.

  32. Object Number: 516790  Size: SH
  33. Remove the upper intake manifold gasket from the groove.
  34. Discard the gasket.

  35. Object Number: 516773  Size: SH
  36. Remove the seal from the fuel meter body assembly.
  37. Discard the seal.
  38. Important: Do not immerse the assembled upper intake manifold in cleaning solvent.

  39. Clean all sealing surfaces and the inside of the upper intake manifold with a shop towel and cleaning solvent.
  40. Inspect the upper intake manifold for the following:
  41. • Cracks or other damage to the exterior
    • Cracking or damage to the gasket grooves
    • Loose or damaged bolt hole thread inserts

    Object Number: 516804  Size: SH
  42. If replacing the upper intake manifold, turn and remove the power brake booster vacuum tube fitting from the upper intake manifold.
  43. Remove and discard the seal.

  44. Object Number: 516797  Size: SH
  45. If replacing the upper intake manifold, turn and remove the PCV valve cover from the upper intake manifold.
  46. Remove and discard the seal.
  47. Remove the throttle body if replacing the upper intake manifold. Refer to Throttle Body Assembly Replacement .
  48. Remove the MAP sensor if replacing the upper intake manifold. Refer to Manifold Absolute Pressure Sensor Replacement .

Installation Procedure


    Object Number: 516797  Size: SH
  1. Install the throttle body, if removed. Refer to Throttle Body Assembly Replacement .
  2. Install the MAP sensor, if removed. Refer to Manifold Absolute Pressure Sensor Replacement .
  3. Install the PCV valve cover, if removed, using the following procedure:
  4. 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.

    Object Number: 516804  Size: SH
  5. Install the power brake booster vacuum tube fitting, if removed, using the following procedure:
  6. 4.1. 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.

    Object Number: 516773  Size: SH
  7. Install a NEW seal on the fuel meter body assembly.
  8. Lubricate the seal with clean engine oil.

  9. Object Number: 516790  Size: SH
  10. Install a NEW upper intake manifold to lower intake manifold gasket in the groove of the upper intake manifold.

  11. Object Number: 516794  Size: SH
  12. Install the upper intake manifold onto the lower intake manifold.
  13. If reusing the fasteners, apply Threadlock to the threads of the upper intake manifold attaching bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.
  14. Notice: Refer to Fastener Notice in the Preface section.

  15. Install the upper intake manifold attaching studs.
  16. Tighten

    1. Tighten the upper intake manifold attaching studs on the first pass to 5 N·m (44 lb in).
    2. Tighten the upper intake manifold attaching studs on the final pass to 9 N·m (80 lb in).
  17. Install the fuel lines to the fuel meter body assembly. Refer to Fuel Hose/Pipes Replacement - Engine Compartment .
  18. Install the distributor cap. Refer to Distributor Replacement .
  19. Install the ignition control module. Refer to Ignition Control Module Replacement .
  20. Install the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .

  21. Object Number: 398027  Size: SH
  22. Install the accelerator control cable bracket, studs, and nuts to the intake manifold and the throttle body.
  23. Tighten
    Tighten the accelerator control cable bracket nuts and studs to 12 N·m (106 lb in).


    Object Number: 374900  Size: SH
  24. Connect the A/C vacuum hose to the intake manifold.
  25. Install the power brake booster vacuum hose bracket and nut to the intake manifold stud.
  26. Tighten
    Tighten the power brake booster vacuum hose bracket nut to 11 N·m (97 lb in).

  27. Connect the power brake booster vacuum hose to the intake manifold.

  28. Object Number: 339442  Size: SH
  29. Install the bracket for the engine wiring harness on the lower intake manifold stud.
  30. Install the engine wiring harness bracket nut.
  31. Tighten
    Tighten the engine wiring harness bracket nut to 12 N·m (106 lb in).


    Object Number: 532770  Size: SH
  32. Connect the following electrical connectors:
  33. • The fuel meter body assembly connector (1)
    • The EVAP canister purge solenoid valve (2)
    • The manifold absolute pressure (MAP) sensor (3)

    Object Number: 532760  Size: SH
  34. Connect the following electrical connectors:
  35. • 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

    Object Number: 172995  Size: SH
  36. Connect the PCV valve hose assembly to the intake manifold and the valve rocker arm cover.
  37. Install the cruise control cable, if equipped to the throttle shaft and the accelerator control cable bracket. Refer to Cruise Control Cable Replacement .
  38. Install the accelerator control cable to the throttle shaft and the accelerator control cable bracket. Refer to Accelerator Control Cable Replacement .

  39. Object Number: 35885  Size: SH
  40. Install the air cleaner outlet duct (2) on the throttle body assembly.
  41. Tighten the retaining nut (1).
  42. Tighten
    Tighten the nut to 2 N·m (18 lb in).

  43. Connect the PCV tube to the air cleaner outlet duct.
  44. Position the coolant reservoir. Install the bolt.
  45. Tighten
    Tighten the bolt to 11 N·m (97 lb in).

  46. Install the air cleaner. Refer to Air Cleaner Assembly Replacement .
  47. Install the engine cover. Refer to Engine Cover Replacement .