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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.3L (Unit Repair) >> Repair Instructions >> Intake Manifold Disassemble (LU3)

Intake Manifold Disassemble (LU3)

  1. Remove the nuts, the studs, and the accelerator control cable bracket.
    Fig 1: Accelerator Control Cable Bracket, Nuts & Studs
    G01660490Courtesy of GENERAL MOTORS CORP.
  2. Remove the throttle body attaching studs.
    Fig 2: Throttle Body & Studs
    G01660491Courtesy of GENERAL MOTORS CORP.
  3. Remove the throttle body.
  4. Remove the throttle body to upper intake manifold gasket.
  5. Discard the throttle body to upper intake manifold gasket.
    Fig 3: Throttle Body & Gasket
    G01660492Courtesy of GENERAL MOTORS CORP.
  6. Remove the water outlet studs.
  7. Remove the water outlet (1 or 2).
  8. Remove the engine coolant thermostat.
    Fig 4: Water Outlet, Studs & Engine Coolant Thermostat
    G01660493Courtesy of GENERAL MOTORS CORP.

    Important:  Note the position and direction of the exhaust gas recirculation (EGR) valve before removal. It is possible to improperly install the EGR valve 180 degrees from the original position.

  9. Remove the exhaust gas recirculation (EGR) valve bolts.

    Some applications will not have an EGR valve.

    Fig 5: EGR Valve & Bolts
    G01660494Courtesy of GENERAL MOTORS CORP.
    NOTE: The Linear EGR valve is an electrical component. DO NOT soak in any liquid cleaner or solvent because damage may result.
  10. Remove the EGR valve and the EGR valve gasket from the lower intake manifold.
  11. Discard the EGR valve gasket.
    Fig 6: EGR Valve & Gasket
    G01660495Courtesy of GENERAL MOTORS CORP.
  12. Remove the engine coolant temperature (ECT) sensor plug (1) or the ECT sensor (2) from the front of the lower intake manifold, if equipped.
    Fig 7: ECT Sensor & Plug
    G01660496Courtesy of GENERAL MOTORS CORP.
  13. Remove the studs and the ignition coil.
    Fig 8: Ignition Coil & Studs
    G01660497Courtesy of GENERAL MOTORS CORP.
  14. Remove the manifold absolute pressure (MAP) sensor.
  15. Remove the MAP sensor seal from the MAP sensor.
  16. Discard the MAP sensor seal.
    Fig 9: MAP Sensor
    G01660498Courtesy of GENERAL MOTORS CORP.
  17. Remove the fuel pipe bolt (4).
  18. Remove the fuel pipe retainer nuts (1).
  19. Remove the fuel pipe retainer (2).
  20. Remove the fuel pipe (3).
  21. Remove and discard the fuel seal retainers (5).
  22. Remove and discard the fuel seals (6), yellow O-rings.
  23. Remove and discard the spacer rings (7), flat washers.
  24. Remove and discard the fuel seals (8), black O-rings.
    Fig 10: Fuel Pipes, Seals, Spacer Rings & Retainers
    G01660499Courtesy of GENERAL MOTORS CORP.
  25. Remove the studs and the evaporative emission (EVAP) canister purge solenoid valve.
  26. Remove the nut and the engine wiring harness bracket.
    Fig 11: EVAP Canister Purge Solenoid Valve & Studs
    G01660500Courtesy of GENERAL MOTORS CORP.
  27. Remove the upper intake manifold attaching studs.
  28. Remove the upper intake manifold.
  29. Remove the upper intake manifold to lower intake manifold gasket.
  30. Discard the upper intake manifold to lower intake manifold gasket.
    Fig 12: Upper Intake Manifold, Studs & Gasket
    G01660501Courtesy of GENERAL MOTORS CORP.
  31. Remove the fuel meter body seal and discard.

    Important:  The injectors may require increased effort when removing.

  32. Remove the 6 injectors from the lower intake manifold bores.
  33. Remove the fuel meter body.

    Important:  Discard the old fuel meter body bracket and install a new bracket when converting from SFI (L35) to MFI (LU3) fuel systems.

  34. Remove the bolt and the fuel meter body bracket.
    Fig 13: Fuel Meter Body (LU3)
    G01660502Courtesy of GENERAL MOTORS CORP.
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