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

Removal Procedure

Tools Required

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.

    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 .
  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.

Installation Procedure

    Object Number: 54358 Size: SH
  1. Install the upper intake manifold.
  2. Install the upper intake manifold bolts.

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

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

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

    12. Object Number: 54670 Size: SH
  12. Install the EGR pipe to the exhaust manifold.
  13. Install the following items to the throttle body:
    14. • Throttle body cable
    • Cruise control cable
  14. Install the top half of the air cleaner assembly.
  15. Install the brake vacuum pipe.
  16. Install the cables to the throttle body.
  17. Fill the cooling system. Refer to Draining, Flushing and Filling the Cooling System in Cooling and Radiator.
  18. Connect the negative battery cable.
  19. Inspect for proper fluid levels.
  20. Check for leaks.