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Home >> Cadillac >> 2010 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System & Fuel System - 5.3L, 6.0L, 6.2L - Repair Instructions >> Repair Instructions >> Fuel Injector Replacement >> Removal Procedure
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Removal Procedure

CAUTION: Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method.
NOTE:
  • An 8-digit identification number is located on the fuel rail. Refer to this identification number when servicing or when part replacement is required.
  • The engine oil may be contaminated with fuel if the fuel injectors are leaking.
    Fig 1: View Of Engine Harness Retainer Nut & Electrical Connectors
    GM1696891Courtesy of GENERAL MOTORS CORP.
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief (CH-48027)  or Fuel Pressure Relief (Without CH-48027) .
  3. Remove the engine wiring harness bracket nut (1).
  4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid.
  5. Disconnect the engine wiring harness electrical connector (3) from the generator.
  6. Disconnect the engine wiring harness electrical connector (4) from the manifold absolute pressure (MAP) sensor.
    7. Fig 2: View Of CPA Retainer, Electrical Connectors & Engine Harness Clips
    GM1696892Courtesy of GENERAL MOTORS CORP.
  7. Remove the connector position assurance (CPA) retainer (2).
  8. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  9. Disconnect the engine wiring harness electrical connectors (3) from the fuel injectors, perform the following:
    1. Mark the connectors to their corresponding injectors to ensure correct reassembly.
    2. Pull the CPA retainer on the connector up 1 click.
    3. Push the tab on the connector in.
    4. Disconnect the fuel injector electrical connector.
    10. Fig 3: View Of CPA Retainer, Engine Harness Electrical Connectors & Harness Clips
    GM1696893Courtesy of GENERAL MOTORS CORP.
  10. Remove the CPA retainer (2).
  11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  12. Disconnect the engine wiring harness electrical connector (3) from the electronic throttle control.
  13. Disconnect the engine wiring harness electrical connectors (7) from the fuel injectors, perform the following:
    1. Mark the connectors to their corresponding injectors to ensure correct reassembly.
    2. Pull the CPA retainer on the connector up 1 click.
    3. Push the tab on the connector in.
    4. Disconnect the fuel injector electrical connector.
  14. Remove the engine wiring harness clip (4) from the generator battery jumper cable.
  15. Remove the engine wiring harness clip (6) from the ignition coil bracket stud.
    16. Fig 4: View Of Battery Cable Terminals & Stud
    GM1699543Courtesy of GENERAL MOTORS CORP.
  16. Remove the negative battery cable stud (1) from the right cylinder head.
  17. Remove the negative battery cable terminal (2) and engine wiring harness ground terminal (3) from the cylinder head.
    18. Fig 5: View Of Engine Wiring Harness, Clip, Bolt & Connector
    GM1696914Courtesy of GENERAL MOTORS CORP.
  18. Remove the engine wiring harness clip bolt (3) from the generator bracket.
  19. Gather the branches of the engine wiring harness and reposition the aside.
    20. Fig 6: View Of PCV Hose
    GM1696791Courtesy of GENERAL MOTORS CORP.
  20. Remove the positive crankcase ventilation (PCV) hose.
    21. Fig 7: View Of EVAP Canister Purge Tube & Quick Connect Fitting
    GM1696917Courtesy of GENERAL MOTORS CORP.
  21. Disconnect the chassis fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    22. Fig 8: View Of EVAP Tube & Purge Solenoid
    GM1697062Courtesy of GENERAL MOTORS CORP.
  22. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to Plastic Collar Quick Connect Fitting Service .
  23. Disconnect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
  24. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
  25. Remove the EVAP tube and purge solenoid.
    26. Fig 9: View Of Fuel Rail & Bolts
    GM1697066Courtesy of GENERAL MOTORS CORP.
  26. Remove the fuel rail bolts.
    27. 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.
    NOTE: Before removal, clean the fuel rail with a spray type engine cleaner, such as GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
    NOTE: Lift evenly on both sides of the fuel rail until all injectors are removed from their bores.
  27. Remove the fuel rail assembly.
    28. Fig 10: View Of Fuel Rail & Components
    GM1706106Courtesy of GENERAL MOTORS CORP.
  28. Remove the fuel injector retainers (1).
  29. Remove the fuel injectors (3) from the fuel rail.
  30. Remove and discard the fuel injector upper and lower O-ring seals (2 and 4).
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