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Home › GMC › 2012 › Yukon Hybrid, 4WD › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Controls/Fuel - Hybrid (LZ1) - Repair Instructions › Repair Instructions › Fuel Injector Replacement › Removal Procedure

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 Wiring Harness Bracket & Nut
    GM1964659Courtesy of GENERAL MOTORS COMPANY
  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 (Without CH 48027) .
  3. Remove the engine wiring harness bracket nut (1).
    4. Fig 2: View Of Engine Wiring Harness Electrical Connectors, EVAP Purge Solenoid & MAP Sensor
    GM1960247Courtesy of GENERAL MOTORS COMPANY
  4. Disconnect the engine wiring harness electrical connector (2) from the evaporative emission (EVAP) purge solenoid (3).
  5. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor (4).
    6. Fig 3: View Of Engine Wiring Harness Electrical Connectors & CPA Retainer
    GM1964662Courtesy of GENERAL MOTORS COMPANY
  6. Remove the connector position assurance (CPA) retainer (2).
  7. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  8. 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.
  9. Remove the engine wiring harness clip (4) from the ignition coil bracket stud.
    10. Fig 4: View Of Engine Wiring Harness Electrical Connectors & Clip
    GM1960882Courtesy of GENERAL MOTORS COMPANY
  10. Remove the CPA retainer.
  11. Disconnect the engine wiring harness electrical connector (1) from the ignition coil main electrical connector.
  12. Disconnect the engine wiring harness electrical connector (2) from the electronic throttle control.
  13. Disconnect the engine wiring harness electrical connectors (5) 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 ignition coil bracket stud.
    15. Fig 5: View Of Heater Hose Bracket & Nut
    GM1964664Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The auxiliary heater water pump hose and the surge tank outlet hose do not need to be removed from the bracket in order to reposition the bracket.

  15. Remove the heater hose bracket nut (2) and bracket (1). Reposition the bracket out of the way. Hoses shown removed for clarity.
    16. Fig 6: Locating Engine Wiring Harness Electrical Connector, Clip, Bolt & ECT Sensor
    GM1960215Courtesy of GENERAL MOTORS COMPANY
  16. Remove the engine wiring harness clip bolt (4) from the generator bracket.
  17. Gather the branches of the engine wiring harness and reposition the aside.
    18. Fig 7: View Of PCV Hose
    GM1696791Courtesy of GENERAL MOTORS COMPANY
  18. Remove the positive crankcase ventilation (PCV) hose.
    19. Fig 8: View Of EVAP Canister Purge Tube & Quick Connect Fitting
    GM1696917Courtesy of GENERAL MOTORS COMPANY
  19. Disconnect the chassis fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
    20. Fig 9: View Of EVAP Tube & Purge Solenoid
    GM1697062Courtesy of GENERAL MOTORS COMPANY
  20. Disconnect the EVAP tube quick connect fitting at the intake manifold. Refer to Plastic Collar Quick Connect Fitting Service .
  21. Disconnect the chassis EVAP tube quick connect fitting at the EVAP canister purge solenoid. Refer to Plastic Collar Quick Connect Fitting Service .
  22. Disengage the retainer securing the EVAP canister purge solenoid to the fuel rail.
  23. Remove the EVAP tube and purge solenoid.
    24. Fig 10: View Of Fuel Rail & Bolts
    GM1697066Courtesy of GENERAL MOTORS COMPANY
  24. Remove the fuel rail bolts.
    25. 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.

  25. Remove the fuel rail assembly.
    26. Fig 11: View Of Fuel Rail & Components
    GM1706106Courtesy of GENERAL MOTORS COMPANY
  26. Remove the fuel injector retainers (1).
  27. Remove the fuel injectors (3) from the fuel rail.
  28. Remove and discard the fuel injector upper and lower O-ring seals (2 and 4).
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