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Intake Manifold Assemble (LU3)

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. If reusing the fastener, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the fuel meter body bracket bolt.
    NOTE: Refer to FASTENER NOTICE .
  2. Install the fuel meter body bracket and bolt.

    Tighten 

    Tighten the fuel meter bracket bolt to 10 N.m (89 lb in).

    IMPORTANT: All injector lines must face forward as the fuel meter body is snapped into the bracket. Also, the number three fuel tube must be positioned behind the number one fuel tube to eliminate interference with the upper intake manifold when installed.
  3. Install the fuel meter body into the fuel meter body bracket.
    Fig 1: Install Fuel Injectors
    G02106330Courtesy of GENERAL MOTORS CORP.
  4. Install the 6 injectors into the proper lower intake manifold bores in proper sequence (3, 5, 1, 2, 4, 6).
  5. Inspect the injectors in order to ensure that they are firmly seated and locked in the lower intake manifold bores.
  6. Ensure that the electrical connections of the injectors are positioned so that they do not interfere with each other, and are pointing towards the center of the intake manifold. Rotate the electrical connector inboard if necessary. Also, ensure there is no tension on the injector wires.
  7. Install a NEW upper intake manifold to lower intake manifold gasket into the groove of the upper intake manifold.
  8. Install the upper intake manifold onto the lower intake manifold.
  9. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the upper intake manifold attaching studs.
  10. Install the upper intake manifold attaching studs.

    Tighten 

    1. 10.1. Tighten the upper intake manifold attaching studs on the first pass to 5 N.m (44 lb in).
    2. 10.2. Tighten the upper intake manifold attaching studs on the final pass to 9 N.m (80 lb in).
    Fig 2: Install Upper Intake Manifold & Attaching Studs
    G02106331Courtesy of GENERAL MOTORS CORP.
  11. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the evaporative emission (EVAP) canister purge solenoid valve studs.
  12. Install the EVAP canister purge solenoid valve and studs.

    Tighten 

    Tighten the EVAP canister purge solenoid valve studs to 10 N.m (89 lb in).

  13. Install the engine wiring harness bracket and nut.

    Tighten 

    Tighten the engine wiring harness bracket nut to 12 N.m (106 lb in).

    Fig 3: Install EVAP Canister Purge Solenoid Valve & Studs
    G02106332Courtesy of GENERAL MOTORS CORP.
  14. Install the NEW fuel seals (8), black O-rings, into the fuel meter body.
  15. Install the NEW spacer rings (7), flat washers, into the fuel meter body.
  16. Install the NEW fuel seals (6), yellow O-rings, into the fuel meter body.
  17. Install the NEW fuel seal retainers (5) into the fuel meter body.
  18. Install the fuel pipe (3) into the fuel meter body.
  19. Install the fuel pipe retainer bracket (2) onto the fuel pipe.
  20. Install the fuel pipe retainer bracket nuts (1).
  21. If reusing the fastener, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the fuel pipe bolt.
  22. Install the fuel pipe bolt (4).

    Tighten 

    1. 22.1. Tighten the fuel pipe bracket nuts to 3 N.m (27 lb in).
    2. 22.2. Tighten the fuel pipe bolt to 6 N.m (53 lb in).
    Fig 4: Fuel Pipe & Components
    G02106333Courtesy of GENERAL MOTORS CORP.
  23. Install a NEW manifold absolute pressure (MAP) sensor seal onto the MAP sensor.
  24. Apply a small amount, approximately 1 drop, of clean engine oil to the MAP sensor seal.
  25. Install the MAP sensor into the upper intake manifold.
    Fig 5: Install Manifold Absolute Pressure (MAP) Sensor & Seal
    G02106334Courtesy of GENERAL MOTORS CORP.
  26. Install the ignition coil and studs.

    Tighten 

    Tighten the ignition coil studs to 12 N.m (106 lb in).

    Fig 6: Install Ignition Coil & Studs
    G02106335Courtesy of GENERAL MOTORS CORP.
  27. If reusing the engine coolant temperature (ECT) sensor plug (1) or the ECT sensor (2), if equipped, apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the threads of the ECT sensor plug (1) or the ECT sensor (2).
  28. Install the ECT sensor or plug, if equipped, into the front of the lower intake manifold.

    Tighten 

    Tighten the ECT sensor or plug to 20 N.m (15 lb ft).

    Fig 7: Install ECT Sensor Plug & ECT Sensor
    G02106336Courtesy of GENERAL MOTORS CORP.
  29. Install the engine coolant thermostat.
  30. Install the water outlet (1 or 2).
  31. Install the water outlet studs.

    Tighten 

    Tighten the water outlet studs to 25 N.m (18 lb ft).

    Fig 8: Install Water Outlet & Studs
    G02106337Courtesy of GENERAL MOTORS CORP.
  32. Install a NEW throttle body gasket into the groove in the upper intake manifold.
  33. Install the throttle body onto the upper intake manifold.
    Fig 9: Install Throttle Body & Gasket
    G02106338Courtesy of GENERAL MOTORS CORP.
  34. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the threads of the throttle body attaching studs.
  35. Install the throttle body attaching studs.

    Tighten 

    Tighten the throttle body attaching studs to 9 N.m (80 lb in).

    Fig 10: Install Throttle Body Attaching Studs
    G02106339Courtesy of GENERAL MOTORS CORP.
  36. Install the accelerator control cable bracket, the studs, and the nuts.

    Tighten 

    1. 36.1. Tighten the accelerator control cable bracket stud to the intake manifold to 6 N.m (53 lb in).
    2. 36.2. Tighten the accelerator control cable bracket nuts to 12 N.m (106 lb in).
    3. 36.3. Tighten the accelerator control cable bracket stud to the throttle body to 12 N.m (106 lb in).
    Fig 11: Install Accelerator Control Cable Bracket, Studs & Nuts
    G02106340Courtesy of GENERAL MOTORS CORP.
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