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Home › Cadillac › 2008 › XLR V › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 4.4L - Introduction › Repair Instructions › Fuel Injector and Fuel Rail Replacement › Installation Procedure

Installation Procedure

    NOTE:
    • Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination.
    • Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components.
    • Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.
    Fig 1: View Of Injector Lower O-Ring Seal
    GM1685823Courtesy of GENERAL MOTORS CORP.
  1. If the injectors were removed from the fuel rail, lubricate the new fuel injector O-ring seals with clean engine oil.
  2. Install the new fuel injector O-ring seals on to the fuel injectors.
  3. Install the fuel injectors to the fuel rail using new retainer clips.
  4. Ensure that the injectors are aligned by orientating the electrical connectors perpendicular to the crankshaft centerline.
  5. Lubricate and install the new O-ring seals on the spray tip end of each injector.
    6. Fig 2: View Of Fuel Rail
    GM1685825Courtesy of GENERAL MOTORS CORP.
  6. Align the fuel injectors and fuel rail to the supercharger assembly.
  7. Reposition the rear inlet duct (3) as necessary, and carefully press the fuel rail assembly (1) downward until fully seated.
    8. NOTE: Refer to Fastener Notice .
  8. Install the fuel rail attaching studs (2).

    Tighten:  Tighten the studs to 10 N.m (89 lb in).

  9. Install the fuel rail to the clip on the front of the supercharger.
    10. Fig 3: View Of Oxygen Sensor Electrical Connector
    GM1760081Courtesy of GENERAL MOTORS CORP.
  10. Install the oxygen sensor electrical connector assemblies (1, 2) to the left side fuel rail brackets.
    11. Fig 4: Identifying Oxygen Sensor Electrical Connector Assemblies
    GM1760078Courtesy of GENERAL MOTORS CORP.
  11. Install the oxygen sensor electrical connector assemblies (1, 2) to the right side fuel rail brackets.
    12. Fig 5: Identifying Ground Wire
    GM1685827Courtesy of GENERAL MOTORS CORP.
  12. Install the ground wire (1) to the right rear injector rail bolt.
    13. Fig 6: View Of Fuel Injector Electrical Connectors
    GM1614623Courtesy of GENERAL MOTORS CORP.
  13. Connect the fuel injector electrical connectors (1, 4, 6, 8) to the left and right side of the engine.
    14. Fig 7: View of Fuel Feed Hose
    GM1685821Courtesy of GENERAL MOTORS CORP.
  14. Connect the engine compartment fuel line fitting (1) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    15. Fig 8: Identifying Supercharger Bypass Solenoid Valve Electrical Connector
    GM1614014Courtesy of GENERAL MOTORS CORP.
  15. Connect the vacuum line to the supercharger actuator valve.
  16. Connect the supercharger bypass solenoid valve electrical connector (3).
    17. Fig 9: Intake Air Temperature (IAT) Sensor Connector
    GM1645247Courtesy of GENERAL MOTORS CORP.
  17. Connect the electrical connector to the air inlet temperature 2 sensor.
    18. Fig 10: View Of Charge Air Cooler & Manifold Assembly
    GM1614613Courtesy of GENERAL MOTORS CORP.
  18. Using NEW O-ring seals, install the front section of the charge air cooler front manifold assembly (2). Refer to Charge Air Cooler Front Manifold Replacement .
    19. Fig 11: Identifying BARO, MAP & SCIAP Sensors
    GM1613998Courtesy of GENERAL MOTORS CORP.
  19. Install the SCIAP (1), BARO (2) and MAP (3) sensors with the bracket.
  20. Connect the vacuum lines to the MAP (3) and SCIAP (1) sensors.
  21. Connect the electrical connectors to the following sensors:
    • The SCIAP sensor
    • The BARO sensor
    • The MAP sensor
  22. Install the front section of the supercharger inlet duct assembly. Refer to Supercharger Inlet Duct Assembly Replacement .
  23. Install the fuel fill pipe cap.
  24. Fill the charge air cooling system with coolant. Refer to Charge Air Cooling System Draining and Filling (Static Fill) .
  25. Check the fuel system for leaks.
  26. Install the engine sight shield. Refer to Intake Manifold Sight Shield Replacement .
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