GM Service Manual Online
For 1990-2009 cars only

Intake Manifold Replacement Upper

Removal Procedure


    Object Number: 163855  Size: SH
  1. Remove the engine cover. Refer to Engine Cover Replacement .
  2. Remove the air cleaner outlet duct from the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  3. Remove the A/C compressor hose assembly. Refer to Auxiliary Air Conditioning Compressor and Condenser Hose Replacement .
  4. Disconnect the following electrical connectors:
  5. • The A/C pressure switch, if equipped
    • The throttle position (TP) sensor
    • The idle air control (IAC) motor
    • The fuel meter body assembly connector
    • The manifold absolute pressure (MAP) sensor
    • The EVAP canister purge solenoid valve

    Object Number: 172995  Size: SH
  6. Remove the PCV valve hose assembly from the intake manifold and the valve rocker arm cover.
  7. Disconnect the vacuum hose from the intake manifold, if equipped with A/C.

  8. Object Number: 363396  Size: SH
  9. Remove the engine wiring harness bracket from the stud at the EVAP canister purge solenoid valve.
  10. Remove the EVAP canister purge solenoid. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement in Engine Controls.

  11. Object Number: 398027  Size: SH
  12. Disconnect the accelerator control cable from the throttle shaft. Refer to Accelerator Control Cable Replacement in Engine Controls.
  13. Disconnect the cruise control cable, if equipped. Refer to Cruise Control Cable Replacement in Cruise Control.
  14. Remove the bolt holding the transmission fluid filler tube to the accelerator control cable bracket.
  15. Remove the accelerator control cable bracket from the throttle body and the intake manifold.
  16. Remove the nut holding the engine wiring harness bracket to the intake manifold stud.
  17. Remove the engine wiring harness bracket from the stud.
  18. Remove the fuel lines from the fuel meter body assembly. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls.

  19. Object Number: 334513  Size: SH
  20. Remove the upper intake manifold. Refer to Intake Manifold Disassemble .
  21. Clean all sealing surfaces. Refer to Intake Manifold Clean and Inspect .

Installation Procedure


    Object Number: 31649  Size: SH
  1. Install the upper intake manifold. Refer to Intake Manifold Assemble .
  2. Install the fuel lines to the fuel meter body assembly. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls.

  3. Object Number: 398027  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the accelerator control cable bracket, studs, and nuts to the intake manifold and the throttle body.
  5. Tighten
    Tighten the accelerator control cable bracket nuts and studs to 12 N·m (106 lb in).

  6. Install the transmission fluid fill tube and bolt to the accelerator control cable bracket.
  7. Tighten
    Tighten the transmission fluid fill tube bolt 6 N·m (53 lb in).

  8. Install the cruise control cable, if equipped. Refer to Cruise Control Cable Replacement in Cruise Control.
  9. Install the accelerator control cable to the throttle shaft. Refer to Accelerator Control Cable Replacement in Engine Controls.

  10. Object Number: 363391  Size: SH
  11. Install the engine wiring harness bracket and nut to the intake manifold stud.
  12. Tighten
    Tighten the engine wiring harness bracket nut to 12 N·m (106 lb in).


    Object Number: 363396  Size: SH
  13. Install the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement in Engine Controls.
  14. Install the engine wiring harness bracket and the nut onto the stud at the EVAP canister purge solenoid valve.
  15. Tighten
    Tighten the engine wiring harness bracket nut to 8 N·m (71 lb in).


    Object Number: 172995  Size: SH
  16. Connect the PCV valve hose assembly to the intake manifold and the valve rocker arm cover.
  17. Connect the vacuum hose to the intake manifold, if equipped with A/C.

  18. Object Number: 163855  Size: SH
  19. Install the A/C compressor hose assembly. Refer to Auxiliary Air Conditioning Compressor and Condenser Hose Replacement .
  20. Connect the following electrical connectors:
  21. • The A/C pressure switch, if equipped
    • The throttle position (TP) sensor
    • The idle air control (IAC) motor
    • The fuel meter body assembly connector
    • The manifold absolute pressure (MAP) sensor
    • The EVAP canister purge solenoid valve
  22. Install the air cleaner outlet duct to the throttle body assembly. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  23. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.

Intake Manifold Replacement Lower

Removal Procedure


    Object Number: 71614  Size: SH
  1. Disconnect the battery negative cable. Refer to Battery Replacement in Engine Electrical.
  2. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  3. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  4. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
  5. Remove the air cleaner outlet duct from the throttle body assembly. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  6. Remove the radiator inlet hose at the water outlet. Refer to Radiator Hose Replacement in Engine Cooling.
  7. Remove the heater hose from the intake manifold. Refer to Heater Water Bypass Valve Replacement in Heating and Ventilation (Non-A/C).
  8. Remove the water pump inlet hose from the intake manifold.
  9. Remove the ground wire from the stud at the water outlet.

  10. Object Number: 398027  Size: SH
  11. Disconnect the accelerator control cable from the throttle shaft. Refer to Accelerator Control Cable Replacement in Engine Controls.
  12. Disconnect the cruise control cable, if equipped. Refer to Cruise Control Cable Replacement in Cruise Control.
  13. Remove the bolt holding the transmission fluid filler tube to the accelerator control cable bracket.
  14. Remove the accelerator control cable bracket from the throttle body and the intake manifold.

  15. Object Number: 163855  Size: SH
  16. Disconnect the following electrical connectors:
  17. • The fuel meter body assembly
    • The EVAP canister purge solenoid valve
    • The idle air control (IAC) motor
    • The throttle position (TP) sensor
    • The engine coolant temperature (ECT) gauge sensor
    • The A/C compressor high pressure switch, if equipped
    • The A/C clutch switch, if equipped
    • The exhaust gas recirculation (EGR) valve
    • The engine coolant temperature (ECT) sensor

    Object Number: 340090  Size: SH
  18. In order to remove the front intake manifold bolt, perform the following:
  19. 15.1. Remove the drive belt. Refer to Drive Belt Replacement .
    15.2. Remove the A/C compressor side brace.
    15.3. Loosen the nut for the power steering pump rear bracket.
    15.4. Remove the oil filler tube bracket bolt and the oil filler tube.
    15.5. Remove the bolts and the nut for the power steering pump mounting bracket.
    15.6. Leave the A/C compressor, if equipped, and the power steering pump on the bracket.
    15.7. Slide the power steering pump bracket forward to access the bolt at the front of the intake manifold.
  20. Remove the distributor. Refer to Distributor Replacement in Engine Electrical.

  21. Object Number: 172982  Size: SH
  22. Remove the exhaust gas recirculation (EGR) valve inlet pipe from the intake and the exhaust manifolds.
  23. Disconnect the fuel supply and the return pipes at the rear of the intake manifold. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls.

  24. Object Number: 172995  Size: SH
  25. Disconnect PCV valve hose assembly from the intake manifold and the valve rocker arm cover.
  26. Disconnect the vacuum hose from the intake manifold, if equipped with A/C.

  27. Object Number: 363391  Size: SH
  28. Remove the nut holding the A/C hose bracket to the intake manifold stud, if equipped.
  29. Remove the nut holding the engine wiring harness bracket to the intake manifold stud.
  30. Remove bolts holding the ignition control module (ICM) and set the ICM aside.

  31. Object Number: 363396  Size: SH
  32. Remove the nut and the engine wiring harness bracket from the stud at the EVAP canister purge solenoid valve.
  33. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement in Engine Controls.

  34. Object Number: 31510  Size: SH
  35. Remove the lower intake manifolds bolts.
  36. Remove the lower intake manifold. Refer to Intake Manifold Removal .
  37. Clean all sealing surfaces. Refer to Intake Manifold Clean and Inspect .

Installation Procedure


    Object Number: 31510  Size: SH
  1. Install the lower intake manifold. Refer to Intake Manifold Installation .

  2. Object Number: 363396  Size: SH
  3. Install the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement in Engine Controls.
  4. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  5. Install the nut and the engine wiring harness bracket to the stud for the EVAP canister purge solenoid valve.
  6. Tighten
    Tighten the engine wiring harness bracket nut to 8 N·m (71 lb in).

  7. Install the ICM. Refer to Ignition Coil and Ignition Coil Module Replacement in Engine Electrical.
  8. Install the fuel supply and return pipes to the rear of the intake manifold. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls.

  9. Object Number: 363391  Size: SH
  10. Install the nut and the engine wiring harness bracket to the intake manifold stud.
  11. Tighten
    Tighten the engine wiring harness bracket nut to 12 N·m (106 lb in).

  12. Install the nut and the A/C hose bracket to the intake manifold stud, if equipped.
  13. Tighten
    Tighten the A/C hose bracket nut to 5 N·m (44 lb in).


    Object Number: 172995  Size: SH
  14. Install the PCV valve hose assembly to the intake manifold and the valve rocker arm cover.
  15. Install the vacuum hose to the intake manifold, if equipped with A/C.

  16. Object Number: 172982  Size: SH
  17. Install the exhaust gas recirculation (EGR) valve inlet pipe to the intake and the exhaust manifolds.
  18. Tighten

        • Tighten the EGR valve inlet pipe intake manifold nut to 25 N·m (18 lb ft).
        • Tighten the EGR valve inlet pipe exhaust manifold nut to 30 N·m (22 lb ft).
        • Tighten the EGR valve inlet pipe clamp bolt to 25 N·m (18 lb ft).
  19. Install the distributor. Refer to Distributor Replacement in Engine Electrical.

  20. Object Number: 340090  Size: SH
  21. Reposition the power steering pump mounting bracket.
  22. Install the power steering pump mounting bracket three bolts and the nut.
  23. Tighten
    Tighten the power steering pump mounting bracket bolts and the nut and the power steering pump rear bracket nut to 41 N·m (30 lb ft).

  24. Install A/C compressor side brace and bolts.
  25. Tighten

    1. Tighten the A/C compressor side brace bolt to 50 N·m (37 lb ft)
    2. Tighten the side brace bolt to the generator bracket to 25 N·m (18 lb ft).
  26. Install the oil filler tube and bolt.
  27. Tighten
    Tighten the oil filler tube bolt to 25 N·m (18 lb ft).

  28. Install the drive belt. Refer to. Drive Belt Replacement .
  29. Install the ground wire and the nut to the water outlet stud.
  30. Tighten
    Tighten the ground wire nut to 10 N·m (88 lb in).


    Object Number: 163855  Size: SH
  31. Connect the following electrical connectors:
  32. • The fuel meter body assembly
    • The EVAP canister purge solenoid valve
    • The idle air control (IAC) motor
    • The throttle position (TP) sensor
    • The engine coolant temperature (ECT) gauge sensor
    • The A/C compressor high pressure switch
    • The A/C clutch switch
    • The exhaust gas recirculation (EGR) valve
    • The engine coolant temperature (ECT) sensor

    Object Number: 216754  Size: SH
  33. Install the accelerator control cable bracket, studs, and nuts to the intake manifold and the throttle body.
  34. Tighten
    Tighten the accelerator control cable bracket nuts and studs to 12 N·m (106 lb in).

  35. Install the transmission fluid fill tube and bolt to the accelerator control cable bracket.
  36. Tighten
    Tighten the transmission fluid fill tube bolt 6 N·m (53 lb in).

  37. Install the cruise control cable, if equipped. Refer to Cruise Control Cable Replacement in Cruise Control.
  38. Install the accelerator control cable to the throttle shaft. Refer to Accelerator Control Cable Replacement in Engine Controls.

  39. Object Number: 71614  Size: SH
  40. Install the water pump inlet hose to the intake manifold.
  41. Install the heater hoses. Refer to Heater Water Bypass Valve Replacement in Heating and Ventilation (Non-A/C).
  42. Install the radiator inlet hose to the water outlet. Refer to Radiator Hose Replacement in Engine Cooling.
  43. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  44. Install air cleaner outlet duct to the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls.
  45. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
  46. Connect the battery negative cable. Refer to Battery Replacement in Engine Electrical.
  47. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.