GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 Montana SV6 Ext. 🢒 Engine 🢒 Engine Controls and Fuel - 3.9L 🢒 Upper Intake Manifold Replacement

Removal Procedure

    Object Number: 1582009 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  3. Drain the cooling system. Refer to Cooling System Draining and Filling .
  4. Remove the positive crankcase ventilation (PCV) fresh air tube. Refer to Plastic Collar Quick Connect Fitting Service .

    5. Object Number: 1582012 Size: SH
  5. Remove the PCV foul air tube. Refer to Plastic Collar Quick Connect Fitting Service .
  6. Reposition the brake booster vacuum hose clamp at the intake manifold.
  7. Remove the vacuum hose from the intake manifold.

    8. Object Number: 1675732 Size: SH
  8. Disconnect the engine harness electrical connector (1) from the manifold absolute pressure (MAP) sensor.

    9. Object Number: 1675738 Size: SH
  9. Disconnect the engine harness electrical connectors (1, 2) from the following: electrical connector (1).
    10. • The evaporative emission (EVAP) canister purge solenoid
    • The electronic throttle control (ETC)

    Object Number: 1675736 Size: SH
  10. Disconnect the engine harness electrical connector (1) from the intake manifold tuning valve.

    11. Object Number: 1582091 Size: SH
  11. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  12. Disconnect the left side spark plug wires from the spark plugs.
  13. Disconnect the left side spark plug wires from the ignition control module.
  14. Disengage the spark plug wire retainer clips from the intake manifold bracket and the heater inlet/outlet pipe.
  15. Remove the left side spark plug wires.

    16. Object Number: 1675739 Size: SH
  16. Remove the heater inlet and outlet pipe nuts (1) from the throttle body studs.
  17. Remove the inlet and outlet pipe from the studs.

    18. Object Number: 1582016 Size: SH
  18. Remove the nut from the generator bracket to the intake manifold.
  19. Remove the bolt connecting the generator to the bracket and the generator to the intake manifold.
  20. Remove the bracket.
  21. Remove the bolt holding the transmission dipstick tube to the upper intake manifold.
  22. Remove the ignition coils. Refer to Ignition Coil Replacement .
  23. Remove the upper intake manifold bolts (1, 2) and stud (3).
  24. Separate and remove the upper intake manifold from the lower intake manifold.

    25. Object Number: 1582017 Size: SH
  25. Remove the upper to lower intake manifold gaskets.

    26. Object Number: 1557831 Size: SH
  26. Remove the inlet manifold tuning valve bolts and valve.

    27. Object Number: 1639213 Size: SH
  27. Remove the EVAP canister purge solenoid valve bolt (2) and valve (3).
  28. Remove the MAP sensor bracket bolts, bracket and sensor (1).
  29. Remove the throttle body bolts/studs and throttle body.
  30. Clean the upper intake to lower intake gasket mating surfaces.

    31. Object Number: 1580024 Size: SH
  31. Inspect the intake manifold tuning valve seal for damage. The tuning valve blade attachment to the motor should be tight, with no looseness or slack present. Replace as necessary.
  32. Apply lubricant to the nose of the valve blade (1). Refer to Adhesives, Fluids, Lubricants, and Sealers .

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1557831 Size: SH
  1. Install the inlet manifold tuning valve, and bolts.

    2. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1639213 Size: SH
  2. Inspect the EVAP canister purge solenoid valve seal for damage, replace as necessary.
  3. Install the EVAP canister purge solenoid valve (3) and bolt (2).

    4. Tighten
    Tighten the bolts to 16 N·m (12 lb ft).

  4. Inspect the MAP sensor seal for damage, replace as necessary.
  5. Install the MAP sensor (1), bracket, and bolts.
  6. Inspect the throttle body seal for damage. Replace as necessary.
  7. Apply threadlocker to the throttle body bolts/studs threads. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  8. Install the throttle body and bolts/studs.

    9. Tighten
    Tighten the bolts/studs to 10 N·m (89 lb in).


    Object Number: 1582017 Size: SH
  9. Install the NEW upper to lower intake manifold gaskets.

    10. Object Number: 1582016 Size: SH
  10. Set the upper intake manifold onto the lower intake manifold.
  11. Apply threadlocker to the upper intake manifold bolts/stud threads. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  12. Install the upper intake manifold bolts (1, 2) and stud (3).

    13. Tighten
    Tighten the bolts and stud to 25 N·m (18 lb ft).


    Object Number: 1675739 Size: SH
  13. Install the ignition coil. Refer to Ignition Coil Replacement .
  14. Reposition the transmission tube and install the bolt at the intake manifold.
  15. Install the bracket from the generator to the intake manifold.
  16. Install the bolt connecting the generator, bracket and the intake manifold.
  17. Install the nut connecting the generator bracket to the upper intake manifold.
  18. Install the inlet and outlet pipe to the studs.
  19. Install the heater inlet and outlet pipe nuts (1) to the throttle body studs.

    20. Tighten
    Tighten the nuts to 10 N·m (89 lb in).


    Object Number: 1582091 Size: SH
  20. Install the left side spark plug wires.
  21. Connect the left side spark plug wires to the spark plugs.
  22. Connect the left side spark plug wires to the ignition control module.
  23. Engage the spark plug wire retainer clips to the intake manifold bracket and the heater inlet/outlet pipe.
  24. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .

    25. Object Number: 1675736 Size: SH
  25. Connect the engine harness electrical connector (1) to the intake manifold tuning valve.

    26. Object Number: 1675738 Size: SH
  26. Connect the engine harness electrical connectors (1, 2) to the following:
    27. • The EVAP canister purge solenoid
    • The ETC

    Object Number: 1675732 Size: SH
  27. Connect the MAP sensor electrical connector (1).
  28. Install the brake booster vacuum hose to the intake manifold.
  29. Position the vacuum hose clamp at the intake manifold.

    30. Object Number: 1582012 Size: SH
  30. Install the PCV foul air tube. Refer to Plastic Collar Quick Connect Fitting Service .

    31. Object Number: 1582009 Size: SH
  31. Install the PCV fresh air tube. Refer to Plastic Collar Quick Connect Fitting Service .
  32. Fill the cooling system. Refer to Cooling System Draining and Filling .
  33. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  34. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .