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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Intake Manifold Assemble (LU3)

Intake Manifold Assemble (LU3)

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: During the removal of the fuel injector assembly, the retainers that hold the injectors into the intake manifold may become worn. This is OK. Upon installation of the upper intake manifold, the injectors will be held fully seated, thus keeping them from backing out of the lower intake manifold.
  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.
    2. NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the fuel meter body bracket and bolt.

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

    3. 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.
  4. Install the 6 injectors into the proper lower intake manifold bores in proper sequence (3, 5, 1, 2, 4, 6).
    5. Fig 1: Installing Injectors Into Lower Intake Manifold Bores
    GM859867Courtesy of GENERAL MOTORS CORP.
  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. Fig 2: Installing Upper Intake Manifold
    GM859870Courtesy of GENERAL MOTORS CORP.
  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. Tighten the upper intake manifold attaching studs on the first pass to 5 N.m (44 lb in).
    2. Tighten the upper intake manifold attaching studs on the final pass to 9 N.m (80 lb in).

  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. Fig 3: Installing EVAP Canister Purge Solenoid Valve
    GM334511Courtesy of GENERAL MOTORS CORP.
  13. Install the engine wiring harness bracket and nut.

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

  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. Tighten the fuel pipe bracket nuts to 3 N.m (27 lb in).
    2. Tighten the fuel pipe bolt to 6 N.m (53 lb in).

    23. Fig 4: Fuel Pipe & Components
    GM334517Courtesy 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.
    26. Fig 5: Installing MAP Sensor
    GM480562Courtesy of GENERAL MOTORS CORP.
  26. Install the ignition coil and studs.

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

    27. Fig 6: Installing Ignition Coils & Studs
    GM480561Courtesy 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. Fig 7: ECT Sensor & Plug
    GM480566Courtesy of GENERAL MOTORS CORP.
  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).

  29. Install the engine coolant thermostat.
  30. Install the water outlet (1 or 2).
    31. Fig 8: Installing Water Outlet
    GM480559Courtesy of GENERAL MOTORS CORP.
  31. Install the water outlet studs.

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

  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.
    34. Fig 9: View Of Throttle Body & Gasket
    GM12853Courtesy 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).

    36. Fig 10: View Of Throttle Body & Attaching Studs
    GM12852Courtesy of GENERAL MOTORS CORP.
  36. Install the accelerator control cable bracket, the studs, and the nuts.

    Tighten: 

    1. Tighten the accelerator control cable bracket stud to the intake manifold to 6 N.m (53 lb in).
    2. Tighten the accelerator control cable bracket nuts to 12 N.m (106 lb in).
    3. Tighten the accelerator control cable bracket stud to the throttle body to 12 N.m (106 lb in).

    37. Fig 11: Installing Accelerator Control Cable Bracket
    GM374902Courtesy of GENERAL MOTORS CORP.
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