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Home › Cadillac › 2005 › STS 4.6 A, AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - 4.6L (LH2) - Introduction › Repair Instructions › Fuel Injectors 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 Fuel Rail Assembly
    GM1277261Courtesy of GENERAL MOTORS CORP.
  1. 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. Align the fuel injectors and fuel rail to the intake manifold.
  7. Carefully press the fuel rail assembly downward until fully seated against the intake manifold.
    8. NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Install the fuel rail attaching studs.

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

    9. Fig 2: View Of Sight Shield Bracket
    GM928160Courtesy of GENERAL MOTORS CORP.
  9. Install the fuel injector sight shield bracket nuts.

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

    10. Fig 3: View Of Right Side Fuel Injectors & Electrical Connectors
    GM887914Courtesy of GENERAL MOTORS CORP.
  10. Connect the right side fuel injector electrical connectors (1) to each fuel injector (2).
    11. Fig 4: View Of Left Side Fuel Injectors & Electrical Connectors
    GM887913Courtesy of GENERAL MOTORS CORP.
  11. Connect the left side fuel injector electrical connectors (1) to each fuel injector (2).
    12. Fig 5: View Of Hose Retainers
    GM1235105Courtesy of GENERAL MOTORS CORP.
  12. Install the fuel feed and EVAP lines to the retaining clips (1 and 2) at the right side rear of the engine and at the front of dash.
    13. Fig 6: View Of EVAP Emissions Purge Valve Line & Electrical Connector
    GM1239219Courtesy of GENERAL MOTORS CORP.
  13. Install the EVAP quick connect fitting (2) to the purge valve. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    14. Fig 7: View Of PCV Dirty Air Breather Tube
    GM928153Courtesy of GENERAL MOTORS CORP.
  14. Install the positive crankcase ventilation (PCV) dirty air hose.
    15. Fig 8: View Of Fuel Line-To-Fuel Rail Connection
    GM1234881Courtesy of GENERAL MOTORS CORP.
  15. Connect the fuel feed hose/pipe to the fuel rail (1). Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  16. Install the cross vehicle brace. Refer to Brace Replacement - Cross Vehicle in Body Front End.
  17. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  18. Inspect for fuel leaks using the following procedure:
    1. Turn ON the ignition, with the engine OFF for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition, with the engine OFF.
    4. Inspect for fuel leaks.
  19. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
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