GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Malibu 🢒 Engine 🢒 Engine Controls and Fuel - 3.5L 🢒 Upper Intake Manifold Replacement

Removal Procedure

    Object Number: 1774990 Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Disconnect the fuel feed pipe quick connect fitting (3) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  3. Disconnect the evaporative emission (EVAP) pipe quick connect fitting (2) from the purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
  4. Remove the fuel line clip (1) from the manifold absolute pressure (MAP) sensor bracket.
  5. Reposition the fuel/EVAP lines out of the way.

    6. Object Number: 1774999 Size: SH
  6. Drain the cooling system. Refer to Cooling System Draining and Filling .
  7. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  8. Remove the positive crankcase ventilation (PCV) fresh air tube from the rocker cover.

    9. Object Number: 1774998 Size: SH
  9. Remove the PCV foul air tube quick connect fitting from the rocker cover. Refer to Plastic Collar Quick Connect Fitting Service .
  10. Remove the PCV foul air tube from the intake manifold.

    11. Object Number: 1774992 Size: SH
  11. Reposition the brake booster vacuum hose clamp (2) at the intake manifold.
  12. Remove the brake booster vacuum hose (1) from the intake manifold.

    13. Object Number: 1774996 Size: SH
  13. Reposition the radiator surge tank inlet hose clamp (1).
  14. Remove the radiator surge tank inlet hose from the inlet pipe.

    15. Object Number: 1774997 Size: SH
  15. Remove the radiator surge tank inlet pipe bolts (2).
  16. Remove the radiator surge tank inlet pipe.
  17. Remove and discard the O-ring seal (1).

    18. Object Number: 1774993 Size: SH
  18. Disconnect the engine wiring harness electrical connector (1) from the MAP sensor.

    19. Object Number: 1774876 Size: SH
  19. Disconnect the engine wiring harness electrical connector (1) from the EVAP canister purge solenoid.
  20. Disconnect the engine wiring harness electrical connector (2) from the electronic throttle control (ETC).

    21. Object Number: 1774994 Size: SH
  21. Disconnect the left side spark plug wires from the spark plugs.
  22. Disconnect the left side spark plug wires from the ignition coil.
  23. Disengage the spark plug wire retainer clips from the heater inlet and outlet pipe bracket and the MAP sensor bracket.
  24. Remove the left side spark plug wires.

    25. Object Number: 1774995 Size: SH
  25. Remove the heater inlet and outlet pipe nuts (1) from the throttle body studs.
  26. Reposition the heater inlet and outlet hose clamps (2) from the pipes.
  27. Remove the heater inlet and outlet hoses from the heater inlet and outlet pipes.
  28. Remove the heater inlet and outlet pipe bracket from the throttle body studs. Reposition the inlet and outlet pipe out of the way.

    29. Object Number: 1775000 Size: SH
  29. Remove the ignition coil bracket bolts (1).

    30. Object Number: 1775001 Size: SH
  30. Remove the generator rear brace upper nut (1).
  31. Remove the generator through bolt (3).
  32. Remove the generator rear brace (2).

    33. Object Number: 1775002 Size: SH
  33. Remove the upper intake manifold bolts (1, 2) and stud (3).
  34. Separate and remove the upper intake manifold from the lower intake manifold.

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

    36. Object Number: 1775003 Size: SH
  36. If replacing the upper intake manifold, perform the following steps otherwise proceed to step 8 in the Installation Procedure.
  37. Remove the EVAP canister purge solenoid valve bolt (1), valve (2).
  38. Remove and discard the EVAP canister purge solenoid O-ring seal (3).
  39. Remove the intake manifold cover ball stud (4).
  40. Remove the MAP sensor bracket (5) and MAP sensor (6).
  41. Remove the throttle body bolts (9) and nuts (10).
  42. Remove the throttle body (8) and throttle body O-ring seal (7).

Installation Procedure

    Object Number: 1775003 Size: SH
  1. If replacing the upper intake manifold, perform the following steps otherwise proceed to step 8.
  2. Install a NEW throttle body O-ring seal (7) into the groove on the throttle body and install the throttle body (8).

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the throttle body bolts (9) and nuts (10).

    4. Tighten
    Tighten the bolts/nuts to 10 N·m (89 lb in).

  4. Lubricate the MAP sensor seal and install the MAP sensor (6), place the bracket (5) into position.
  5. Install the intake manifold cover ball stud (4).

    6. Tighten
    Tighten the ball stud to 10 N·m (89 lb in).

  6. Lubricate and install a NEW EVAP canister purge solenoid O-ring seal (3) onto the solenoid.
  7. Install the EVAP canister purge solenoid valve (2) and bolt (1).

    8. Tighten
    Tighten the bolt to 12 N·m (106 lb in).


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

    9. Object Number: 1775002 Size: SH
  9. Set the upper intake manifold onto the lower intake manifold.
  10. Apply threadlock to the upper intake manifold bolts/stud threads. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  11. Install the upper intake manifold bolts (1, 2) and stud (3).

    12. Tighten
    Tighten the bolts/stud to 25 N·m (18 lb ft).


    Object Number: 1775001 Size: SH
  12. Place the generator rear brace (2) onto the stud.
  13. Install the generator through bolt (3) until snug.
  14. Install the generator rear brace upper nut (1) until snug.

    15. Tighten

        • Tighten the generator through bolt to 50 N·m (37 lb ft).
        • Tighten the generator rear brace upper nut to 25 N·m (18 lb ft).

    Object Number: 1775000 Size: SH
  15. Install the ignition coil bracket bolts (1).

    16. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1774995 Size: SH
  16. Position the inlet and outlet pipe and install the heater inlet and outlet pipe bracket to the throttle body studs.
  17. Install the heater inlet and outlet hoses to the heater inlet and outlet pipes.
  18. Position the heater inlet and outlet hose clamps (2) to the pipes.
  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: 1774994 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 coil.
  23. Engage the spark plug wire retainer clips to the heater inlet and outlet pipe bracket and the MAP sensor bracket.

    24. Object Number: 1774876 Size: SH
  24. Connect the engine wiring harness electrical connector (1) to the EVAP canister purge solenoid.
  25. Connect the engine wiring harness electrical connector (2) to the ETC.

    26. Object Number: 1774993 Size: SH
  26. Connect the engine wiring harness electrical connector (1) to the MAP sensor.

    27. Object Number: 1774997 Size: SH
  27. Install a NEW O-ring seal (1) to the inlet pipe.
  28. Install the radiator surge tank inlet pipe.
  29. Install the radiator surge tank inlet pipe bolts (2).

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


    Object Number: 1774996 Size: SH
  30. Install the radiator surge tank inlet hose to the inlet pipe.
  31. Position the radiator surge tank inlet hose clamp (1).

    32. Object Number: 1774992 Size: SH
  32. Install the brake booster vacuum hose (1) to the intake manifold.
  33. Position the brake booster vacuum hose clamp (2) at the intake manifold.

    34. Object Number: 1774998 Size: SH
  34. Install the PCV foul air tube to the intake manifold.
  35. Install the PCV foul air tube quick connect fitting to the rocker cover. Refer to Plastic Collar Quick Connect Fitting Service .

    36. Object Number: 1774999 Size: SH
  36. Install the PCV fresh air tube to the rocker cover.
  37. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  38. Fill the cooling system. Refer to Cooling System Draining and Filling .

    39. Object Number: 1774990 Size: SH
  39. Position the fuel/EVAP lines.
  40. Install the fuel line clip (1) to the MAP sensor bracket.
  41. Connect the fuel feed pipe quick connect fitting (3) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  42. Connect the EVAP pipe quick connect fitting (2) to the purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
  43. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  44. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .