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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Mechanical - 3.9L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Upper >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Positive Crankcase Ventilation (PCV) Fresh Air Tube
    GM1582009Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE .
  2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  3. Drain the cooling system. Refer to Draining and Filling Cooling System (Static Fill) or Draining and Filling Cooling System (Vac-N-Fill) .
  4. Remove the positive crankcase ventilation (PCV) fresh air tube. Refer to PLASTIC COLLAR QUICK CONNECT FITTING SERVICE .
    5. Fig 2: Identifying Positive Crankcase Ventilation (PCV) Foul Air Tube
    GM1582012Courtesy of GENERAL MOTORS CORP.
  5. Remove the PCV foul air tube. Refer to PLASTIC COLLAR QUICK CONNECT FITTING SERVICE .
  6. Reposition the brake booster vacuum hose clamp at the intake manifold.
  7. Remove the vacuum hose from the intake manifold.
    8. Fig 3: Locating MAP Sensor Electrical Connector
    GM1675732Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the engine harness electrical connector (1) from the manifold absolute pressure (MAP) sensor.
    9. Fig 4: Locating EVAP & ETC Electrical Connectors
    GM1675738Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the engine harness electrical connectors (1, 2) from the following: electrical connector (1).
    • evaporative emission (EVAP) canister purge solenoid
    • electronic throttle control (ETC)
    10. Fig 5: Identifying Engine Harness electrical Connector
    GM1675736Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the engine harness electrical connector (1) from the intake manifold tuning valve.
    11. Fig 6: View Of Left Spark Plug/Coil Harness
    GM1582091Courtesy of GENERAL MOTORS CORP.
  11. Remove the air cleaner outlet duct. Refer to AIR CLEANER OUTLET DUCT REPLACEMENT .
  12. Disconnect the left side spark plug wires from the spark plugs.
  13. Disconnect the left side spark plug wires from the ignition control module.
  14. Disengage the spark plug wire retainer clips from the intake manifold bracket and the heater inlet/outlet pipe.
  15. Remove the left side spark plug wires.
    16. Fig 7: Identifying Air Cleaner Outlet Duct Nuts
    GM1675739Courtesy of GENERAL MOTORS CORP.
  16. Remove the heater inlet and outlet pipe nuts (1) from the throttle body studs.
  17. Remove the inlet and outlet pipe from the studs.
  18. Remove the nut from the generator bracket to the intake manifold.
  19. Remove the bolt connecting the generator to the bracket and the generator to the intake manifold.
  20. Remove the bracket.
  21. Remove the bolt holding the transmission dipstick tube to the upper intake manifold
  22. Remove the ignition coils. Refer to IGNITION COIL REPLACEMENT .
  23. Remove the upper intake manifold bolts (1, 2) and stud (3).
    24. Fig 8: Identifying Upper Intake Manifold
    GM1582016Courtesy of GENERAL MOTORS CORP.
  24. Separate and remove the upper intake manifold from the lower intake manifold.
    25. Fig 9: Identifying Upper Intake Manifold Gaskets
    GM1582017Courtesy of GENERAL MOTORS CORP.
  25. Remove the upper to lower intake manifold gaskets.
    26. Fig 10: Identifying Inlet Manifold Tuning Valve
    GM1557831Courtesy of GENERAL MOTORS CORP.
  26. Remove the inlet manifold tuning valve bolts and valve.
    27. Fig 11: Identifying EVAP Canister Purge Solenoid Valve
    GM1639213Courtesy of GENERAL MOTORS CORP.
  27. Remove the EVAP canister purge solenoid valve bolt (2) and valve (3).
  28. Remove the MAP sensor bracket bolts, bracket and sensor (1).
  29. Remove the throttle body bolts/studs and throttle body.
  30. Clean the upper intake to lower intake gasket mating surfaces.
    31. Fig 12: Identifying Tuning Valve Blade
    GM1580024Courtesy of GENERAL MOTORS CORP.
  31. Inspect the intake manifold tuning valve seal for damage. The tuning valve blade attachment to the motor should be tight, with no looseness or slack present, Replace as necessary.
  32. Apply lubricant GM P/N 01050344 (Canadian P/N 993037) or equivalent to the nose of the valve blade (1).
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