GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1996 🢒 Skylark 🢒 Engine 🢒 Engine Mechanical - 3.1L and 3.4L 🢒 Lower Intake Manifold Replacement

Removal Procedure

Tools Required

J 28467-360 J 28467-360 Engine Support Fixture

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    Battery Disconnect Caution in General Information.
  2. Depressurize the fuel system. Refer to Fuel System Pressure Relief in Engine Fuel.
  3. Remove the top half of the air cleaner assembly.
  4. Drain and recover the cooling system. Refer to Draining, Flushing and Filling the Cooling System in Cooling and Radiator.

    5. Object Number: 54670 Size: SH
  5. Remove the EGR pipe from the exhaust manifold.
  6. Remove the drive belt. Refer to Drive Belt Replacement Accessory Drive Belt Replacement .
  7. Remove the brake vacuum pipe at the plenum.
  8. Remove the power steering lines at the generator bracket.
  9. Remove the generator. Refer to Generator in Charging System.

    10. Object Number: 63926 Size: SH
  10. Remove the secondary ignition wires from the spark plugs.

    11. Remove the secondary ignition wires from the harness at the plenum.

  11. Next, remove the following components at the same time:
    12. • Electronic ignition coil and module assembly
    • EVAP canister purge solenoid
  12. Remove the following upper engine wiring connectors:
    13. • Throttle Position (TP) sensor
    • IAC sensor
    • Injector harness
    • Engine Coolant Temperature (ECT) sensor
    • MAP sensor
    • Camshaft Position (CMP) sensor
  13. Remove the following vacuum lines:
    14. • Vacuum Modulator
    • Fuel Pressure Regulator
    • PCV
  14. Remove the MAP sensor from the upper intake manifold.

    15. Object Number: 54358 Size: SH
  15. Remove the upper intake manifold bolts.
  16. Remove the upper intake manifold.

    17. Object Number: 54696 Size: SH
  17. Remove the fuel lines at the fuel rail and the bracket.
  18. Install the J 28467-360 J 28467-360.
  19. Remove the engine mount assembly. Refer to Engine Mount Replacement Engine Mount Replacement .
  20. Remove the power steering mounting bolts. Support the pump aside. Refer to Power Steering Pump in Power Steering Gear and Pump.
  21. Remove the coolant inlet pipe from the coolant outlet housing. Refer to Cooling and Radiator.
  22. Remove the coolant by-pass at the coolant pump and the cylinder head. Refer to Cooling and Radiator.
  23. Remove the radiator hose at the coolant outlet housing.
  24. Remove the coolant outlet housing. Refer to Cooling and Radiator.
  25. Remove both of the valve rocker covers. Refer to Valve Rocker Arm Cover Replacement Valve Rocker Arm Cover Replacement (Left Side).

    26. Important: Retain the washers in the same orientation on the center bolts.


    Object Number: 54281 Size: SH
  26. Remove the lower intake manifold bolts.
  27. Remove the lower intake manifold.

    28. Object Number: 4045 Size: SH
  28. Loosen the rocker arms.

    29. Important: Keep the pushrods in order. The pushrods must be installed in the original position.


    Object Number: 4047 Size: SH
  29. Remove the pushrods.
  30. Remove the intake gasket.
  31. Inspect the flatness of the inlet flanges.
  32. Clean the following items:
    33. • Gasket material from the mating surfaces
    • Excess RTV sealant from the front and the rear ridges of the cylinder
    • Block
    • Sealing surfaces with degreaser

Installation Procedure
  1. Place a 2-3 mm bead of GM RTV sealer P/N 1052917, or equivalent on each ridge where the front and the rear of the intake manifold contact the block.
  2. Install the intake manifold gasket.

    3. Object Number: 4047 Size: SH
  3. Install the pushrods.
    4. 3.1. Install the pushrods in their original location.
    3.2. Coat the ends of the pushrods with prelube GM P/N 1052356, or equivalent.
    3.3. Intake pushrods are marked yellow and are 5 3/4 in long.
    3.4. Exhaust pushrods are marked green and are 6 in long.
    3.5. Ensure that the pushrods seat in the lifter.

    Object Number: 4045 Size: SH
  4. Install the rocker arm bolts.

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

    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.


    Object Number: 54281 Size: SH
  5. Install the lower intake manifold.
  6. Install the lower intake manifold bolts.

    7. Tighten

    1. Apply sealant GM P/N 12345739 to the threads of the bolts.
    2. First, tighten the vertical bolts to 13 N·m (115 lb in).
    3. Then, tighten the diagonal bolts to 13 N·m (115 lb in).
  7. Install the front valve rocker cover. Refer to Valve Rocker Arm Cover Replacement Valve Rocker Arm Cover Replacement (Left Side).
  8. Install the coolant outlet housing. Refer to Cooling and Radiator.
  9. Install the radiator hose to the thermostat housing.
  10. Install the coolant inlet pipe to the thermostat housing.
  11. Install the coolant by-pass pipe at the coolant pump and the cylinder head. Refer to Cooling and Radiator.
  12. Install the power steering pump. Refer to Power Steering Pump in Power Steering Pump and Gear.
  13. Loosely, install the drive belt. Refer to Drive Belt Replacement Accessory Drive Belt Replacement .
  14. Install the engine mount assembly. Refer to Engine Mount Replacement Engine Mount Replacement.
  15. Remove the engine support fixture.

    16. Object Number: 54696 Size: SH
  16. Install the fuel lines to the fuel rail and the bracket.

    17. Object Number: 54358 Size: SH
  17. Install the upper intake manifold.
  18. Install the upper intake manifold bolts.

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

  19. Install the MAP sensor.
  20. Connect the following vacuum lines:
    21. • Vacuum Modulator
    • Fuel Pressure Regulator
    • PCV
  21. Install the following upper engine wiring connectors:
    22. • Throttle Position (TP) sensor
    • IAC
    • Injector harness
    • Engine Coolant Temperature (ECT) sensor
    • MAP sensor
    • Camshaft Position (CMP) sensor
  22. Install the following components:
    23. • EVAP canister purge solenoid
    • Electronic ignition coil and module assembly
  23. Install the generator. Refer to Generator in Charging System.
  24. Install the power steering line at the generator bracket.
  25. Install the drive belt. Refer to Drive Belt Replacement Accessory Drive Belt Replacement.

    26. Object Number: 63926 Size: SH
  26. Install the secondary ignition wires to the spark plugs.
  27. Install the secondary ignition wires to the harness at the plenum.

    28. Object Number: 54670 Size: SH
  28. Install the EGR pipe to the exhaust manifold.
  29. Install the following items to the throttle body:
    30. • Throttle body cable
    • Cruise control cable
  30. Install the top half of the air cleaner assembly.
  31. Install the brake vacuum pipe.
  32. Install the cables to the throttle body.
  33. Fill the cooling system. Refer to Draining, Flushing and Filling the Cooling System in Cooling and Radiator.
  34. Connect the negative battery cable.
  35. Inspect for proper fluid levels.
  36. Check for leaks.