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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System - 4.6L (LH2) - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Injector and Fuel Rail Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
    NOTE:
    • 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 .
  2. Remove the cross vehicle brace. Refer to Cross Vehicle Brace Replacement (DX) .
  3. Clean the fuel rail assembly with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
    4. Fig 1: View Of Fuel Line-To-Fuel Rail Connection
    GM1234881Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the fuel feed hose/pipe (1) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    5. Fig 2: View Of PCV Dirty Air Breather Tube
    GM928153Courtesy of GENERAL MOTORS CORP.
  5. Remove the positive crankcase ventilation (PCV) dirty air hose.
    6. Fig 3: View Of EVAP Emissions Purge Valve Line & Electrical Connector
    GM1239219Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the evaporative emission (EVAP) quick connect fitting (2). Refer to Plastic Collar Quick Connect Fitting Service .
    7. Fig 4: View Of Hose Retainers
    GM1235105Courtesy of GENERAL MOTORS CORP.
  7. Open the retainers (1 and 2) located at the right side rear of the engine and the front of dash. Position the lines aside.
    8. Fig 5: View Of Left Side Fuel Injectors & Electrical Connectors
    GM887913Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the left side fuel injector wiring harness connectors (1) from the fuel injectors (2).
    9. Fig 6: View Of Right Side Fuel Injectors & Electrical Connectors
    GM887914Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the right side fuel injector wiring harness connectors (1) from the fuel injectors (2).
    10. Fig 7: View Of Sight Shield Bracket
    GM928160Courtesy of GENERAL MOTORS CORP.
  10. Remove the fuel injector sight shield bracket.
    11. Fig 8: View Of Fuel Rail Assembly
    GM1277261Courtesy of GENERAL MOTORS CORP.
  11. Remove the fuel rail attaching studs.
  12. Remove the fuel rail assembly.
  13. Remove the injector lower O-ring seal from the spray tip end of each injector.
  14. Discard the O-ring seals.
  15. Remove the retainers from the fuel injectors.
  16. Remove the fuel injectors from the fuel rail.
  17. Remove the O-ring seals from the fuel injectors. Discard the O-ring seals.
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