LEMON Manuals: Even more car manuals for everyone
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 >> Removal Procedure

Removal Procedure

    CAUTION:
    • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
    • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (With CH 48027)  or Fuel Pressure Relief (Without CH 48027) .
  2. Remove the front and rear section of the supercharger inlet duct assembly. Refer to Supercharger Inlet Duct Assembly Replacement .
    3. WARNING: Wear safety glasses when using compressed air in order to prevent eye injury.
  3. Clean the fuel rail and injector ports on the supercharger with compressed air.
    4. Fig 1: Identifying BARO, MAP & SCIAP Sensors
    GM1613998Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the electrical connectors from the following sensors:
    • The supercharger inlet absolute pressure (SCIAP) sensor (1)
    • The barometric pressure (BARO) sensor (2)
    • The manifold absolute pressure (MAP) sensor (3)
  5. Disconnect the vacuum lines from the MAP and SCIAP sensors.
  6. Remove the SCIAP, BARO and MAP sensors with the bracket.
    7. Fig 2: View Of Charge Air Cooler & Manifold Assembly
    GM1614613Courtesy of GENERAL MOTORS CORP.
  7. Partially drain the charge air cooling system. Refer to Charge Air Cooling System Draining and Filling (Static Fill) or Charge Air Cooling System Draining and Filling (Vac N Fill) .
  8. Remove the front section of the charge air cooler front manifold assembly (2). It is not necessary to remove the hoses from the manifold pipes. position the manifold with hoses aside to allow for removal of the fuel rail assembly. Refer to Charge Air Cooler Front Manifold Replacement .
    9. Fig 3: View Of Intake Air Temperature (IAT) Sensor Connector
    GM1645247Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the electrical connector from the air inlet temperature 2 sensor and position aside.
    10. Fig 4: Identifying Supercharger Bypass Solenoid Valve Electrical Connector
    GM1614014Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the supercharger bypass solenoid valve electrical connector (3) and position the harness aside.
  11. Disconnect the vacuum line from the supercharger actuator valve and position the line aside.
    12. Fig 5: Identifying Fuel Line Fitting
    GM1614622Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the engine compartment fuel line fitting (4) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    13. Fig 6: View Of Fuel Injector Electrical Connectors
    GM1614623Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the fuel injector electrical connectors (1, 4, 6, 8) from the left and right side of the engine.
    14. Fig 7: Identifying Fuel Rail
    GM1614611Courtesy of GENERAL MOTORS CORP.
  14. Open the clip (3) that secures the fuel rail jumper to the front of the supercharger.
  15. Remove the fuel rail attaching studs (2).
  16. Remove the fuel rail assembly (1) from the supercharger.
    17. Fig 8: Identifying Fuel Injector & O-Ring
    GM1655589Courtesy of GENERAL MOTORS CORP.
  17. Remove the injector lower O-ring seal from the spray tip end of each injector.
  18. Discard the O-ring seals.
  19. Remove the retainers from the fuel injectors if fuel injector removal is necessary.
  20. Remove the fuel injectors from the fuel rail.
  21. Remove the O-ring seals from the fuel injectors. Discard the O-ring seals.
scientia non olet · About LEMON Manuals