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Home >> Cadillac >> 2009 >> STS 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

    CAUTION:
    • 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: Identifying Fuel Injector & O-Ring
    GM1655589Courtesy 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: Identifying Fuel Rail
    GM1614611Courtesy of GENERAL MOTORS CORP.
  6. Align the fuel injectors and fuel rail to the supercharger assembly.
  7. Carefully press the fuel rail assembly (1) downward until fully seated.
    8. CAUTION: Refer to Fastener Caution .
  8. Install the fuel rail attaching studs (2) and tighten to 10 N.m (89 lb in).
  9. Install the fuel rail to the clip (3) on the front of the supercharger.
    10. Fig 3: View Of Fuel Injector Electrical Connectors
    GM1614623Courtesy of GENERAL MOTORS CORP.
  10. Connect the fuel injector electrical connectors (1,4,6,8) to the left and right side of the engine.
    11. Fig 4: Identifying Fuel Line Fitting
    GM1614622Courtesy of GENERAL MOTORS CORP.
  11. Connect the engine compartment fuel line fitting (4) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    12. Fig 5: Identifying Supercharger Bypass Solenoid Valve Electrical Connector
    GM1614014Courtesy of GENERAL MOTORS CORP.
  12. Connect the vacuum line to the supercharger actuator valve.
  13. Connect the supercharger bypass solenoid valve electrical connector (3).
    14. Fig 6: View Of Intake Air Temperature (IAT) Sensor Connector
    GM1645247Courtesy of GENERAL MOTORS CORP.
  14. Connect the electrical connector to the air inlet temperature 2 sensor.
    15. Fig 7: View Of Charge Air Cooler & Manifold Assembly
    GM1614613Courtesy of GENERAL MOTORS CORP.
  15. Install the front section of the charge air cooler front manifold assembly (2). Refer to Charge Air Cooler Front Manifold Replacement .
    16. Fig 8: Identifying BARO, MAP & SCIAP Sensors
    GM1613998Courtesy of GENERAL MOTORS CORP.
  16. Install the SCIAP (1), BARO (2) and MAP (3) sensors with the bracket.
  17. Connect the vacuum lines to the MAP (3) and SCIAP (1) sensors.
  18. Connect the electrical connectors to the following sensors:
    • The SCIAP sensor
    • The BARO sensor
    • The MAP sensor
  19. Install the front and rear section of the supercharger inlet duct assembly. Refer to Supercharger Inlet Duct Assembly Replacement .
  20. Install the fuel fill pipe cap.
  21. Fill the charge air cooling system with coolant. Refer to Charge Air Cooling System Draining and Filling (Static Fill) or Charge Air Cooling System Draining and Filling (Vac N Fill) .
  22. Check the fuel system for leaks.
  23. Install the engine sight shield. Refer to Intake Manifold Sight Shield Replacement .
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