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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 383 (Engine Mechanical - Hybrid (LZ1) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Engine Harness, Retainer Nut And Connector
    GM1964656Courtesy of GENERAL MOTORS CORP.
    WARNING:

    Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure will perform the following tasks:

    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.

  1. Perform the High Voltage Service disconnect. Refer to High Voltage Disabling .
  2. Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  4. Remove the engine harness retainer nut (1).
  5. Remove the engine harness retainer from the stud and locator pin.
  6. Disconnect the engine harness electrical connector (2) from the evaporative emission (EVAP) canister purge solenoid.
  7. Disconnect the engine wiring harness electrical connector (3) from the manifold absolute pressure (MAP) sensor.
    8. Fig 2: Engine Harness, Connectors And Retainers
    GM1964794Courtesy of GENERAL MOTORS CORP.
  8. Remove the connector position assurance (CPA) retainer (1).
  9. Disconnect the engine harness electrical connector (2) from the ignition coil harness electrical connector.
  10. Disconnect the engine harness electrical connectors (3) from the left side fuel injectors.
  11. Remove the engine harness clip (4) from the ignition coil bracket stud.
    12. Fig 3: CPA Retainer, Engine Harness Electrical Connectors And Harness Clips
    GM1696893Courtesy of GENERAL MOTORS CORP.
  12. Remove the CPA retainer (1).
  13. Disconnect the engine harness electrical connector (2) from the ignition coil harness electrical connector.
  14. Disconnect the engine harness electrical connector (3) from the throttle actuator.
  15. Remove the engine harness clip (4) from the ignition coil bracket stud.
  16. Disconnect the engine harness electrical connectors (5) from the right side fuel injectors.
    17. Fig 4: Engine Wiring Harness, Clip, Bolt And Connectors
    GM1696914Courtesy of GENERAL MOTORS CORP.
  17. Remove the engine harness clip (1) bolt (3).
  18. Disconnect the engine harness electrical connector (2) from the engine coolant temperature (ECT) sensor.
  19. Disconnect the generator control module electrical connector.
  20. Gather the engine harness branches and tie the harness up out of the way to the cowl panel.
    21. Fig 5: EVAP Canister Purge Tube And Quick Connect Fitting
    GM1696917Courtesy of GENERAL MOTORS CORP.
  21. Disconnect the EVAP canister purge tube (1) quick connect fitting from the EVAP canister purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
  22. Disconnect the fuel feed line quick connect fitting (2) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    23. Fig 6: PCV Hose
    GM1696791Courtesy of GENERAL MOTORS CORP.
  23. Remove the positive crankcase ventilation (PCV) hose from the intake manifold fitting.
  24. Position the hose out of the way.
    25. Fig 7: Intake Manifold
    GM1401989Courtesy of GENERAL MOTORS CORP.
  25. Loosen the intake manifold bolts (512).
    26. NOTE:

    The aid of an assistant may be helpful in holding the engine harness up out of the way so the upper intake manifold cover does not get caught against the engine harness.

  26. Remove the intake manifold (500).
  27. Cover the cylinder head passages in order to prevent dirt or debris from entering the passages.
    28. Fig 8: Intake Manifold-To-Cylinder Head Gasket
    GM1277097Courtesy of GENERAL MOTORS CORP.
  28. Remove and discard the intake manifold gaskets (514).
  29. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .
    30. Fig 9: Upper Intake Manifold Cover And Nut
    GM1697057Courtesy of GENERAL MOTORS CORP.
  30. Remove the upper intake manifold cover nut.
  31. Remove the upper intake manifold cover.
    32. Fig 10: MAP Sensor And Retainer
    GM1697060Courtesy of GENERAL MOTORS CORP.
  32. Remove the manifold absolute pressure (MAP) sensor retainer.
  33. Remove the MAP sensor and discard the MAP sensor seal.
    34. Fig 11: EVAP Tube And Purge Solenoid
    GM1697062Courtesy of GENERAL MOTORS CORP.
  34. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to Plastic Collar Quick Connect Fitting Service .
  35. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
  36. Remove the EVAP tube and purge solenoid.
    37. Fig 12: Throttle Body, Gasket And Bolts/Nuts
    GM1697064Courtesy of GENERAL MOTORS CORP.
  37. Remove the throttle body bolts/nuts.
  38. Remove the throttle body.
  39. Remove and discard the throttle body gasket.
    40. Fig 13: Fuel Rail And Bolts
    GM1697066Courtesy of GENERAL MOTORS CORP.
  40. Remove the fuel rail bolts.
    41. NOTE:

    Lift evenly on both sides of the fuel rail until all injectors are removed from their bores.

  41. Remove the fuel rail.
  42. Remove and discard the fuel injector lower O-ring seals.
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