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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 2.0L (LTG) - Repair Instructions >> Repair Instructions >> Fuel Injector Replacement
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Fuel Injector Replacement

Special Tools

Equivalent regional tools: Special Tools

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.

  1. Fuel Injection Fuel Rail - Remove - Fuel Injection Fuel Rail Assembly Replacement 
  2. GM2836381Courtesy of GENERAL MOTORS COMPANY

    Remove and inspect the fuel rail insulator assemblies (1 - 4). Replace the entire assembly if any components show signs of wear or the insulators (4) show the following conditions:

    • Dry or cracked appearance
    • Flattened or misshapen appearance
  3. GM2742603Courtesy of GENERAL MOTORS COMPANY

    Disconnect the electrical connectors from the fuel injectors.

  4. Use the EN-50791  installer (3) to compress the fuel injector (1) and relieve pressure on the retaining pin (2). Remove the fuel injector retaining pin (2). Remove the EN-50791  installer once the retaining pin is removed.
  5. GM2742599Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Support the fuel injector at the widest point.
    • Support the fuel injection fuel rail along the bottom.
    • Do NOT support or hold the fuel injector by the tip or connector.
    • Do NOT tilt or excessively twist the fuel injector during removal.

    Remove the fuel injector (1) from the fuel injection fuel rail by pulling it straight out along the fuel injector axis. Slight rotation of the fuel injector is acceptable as long as excessive force is not applied to the fuel injector tab while engaged in the fuel rail slot (3).

  6. Remove the fuel injector holding clamp (2) from the rear of the fuel injector.
  7. GM2742600Courtesy of GENERAL MOTORS COMPANY

    Remove and DISCARD the fuel injector O-ring (2) and spacer (1).

  8. Remove and DISCARD the fuel injector seals (3).
  9. GM2742601Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT soak or submerge the fuel injection fuel rail or the fuel injectors in solvent. Do NOT use solvent on the fuel rail label.

    Clean the exterior of the fuel injection fuel rail (1) and the fuel injectors in solvent.

  10. Use the EN-47909  cleaning kit to clean the fuel injector bores and sleeves.
  11. Inspect the fuel injection fuel rail and components for the following conditions:
    • Damage, debris, or restrictions to the fuel rail
    • Damage, debris, or restrictions to the fuel ports in the fuel rail
    • Damage to the mounting area for the fuel rail
    • Damage to the fuel rail mounting bolts
    • Damage to the threads on the fuel rail fuel feed fitting
  12. Replace the fuel injection fuel rail if ANY damage is found. Do NOT attempt to repair a fuel rail.
    13. CAUTION:

    Refer to Fastener Caution .

    NOTE:

    Remove and inspect the fuel injection fuel rail fuel pressure sensor ONLY if the sensor is suspect.

  13. Remove and inspect the fuel injection fuel rail fuel pressure sensor (3) for damage using the following procedure:
    1. Disconnect the wiring harness connector from the fuel injection fuel rail fuel pressure sensor.
    2. Remove the fuel injection fuel rail fuel pressure sensor. Dry the pressure sensor bore in the fuel rail with a lint free cloth. The bore should be free of fuel, debris, and burrs.
    3. Lubricate the fuel injection fuel rail fuel pressure sensor bore with clean engine oil.
    4. Lubricate the threads and sealing area on the fuel injection fuel rail fuel pressure sensor with clean engine oil.
    5. Install the fuel injection fuel rail fuel pressure sensor hand tight.
    6. Remove the fuel injection fuel rail fuel pressure sensor and re-lubricate the bore, threads, and sealing area.
    7. Install the fuel injection fuel rail fuel pressure sensor and tighten to 33 N.m (24 lb ft).
    8. Connect the wiring harness connector to the fuel injection fuel rail fuel pressure sensor.
  14. GM2742602Courtesy of GENERAL MOTORS COMPANY

    Inspect the fuel injectors for the following conditions:

    • Damage to the fuel injector connector (3)
    • Damage to the fuel injector harness connector
    • Damage to the fuel injector tip (5)
    • Damage to the fuel injector (4)
  15. Replace the fuel injector if ANY damage is found. Do NOT attempt to repair a fuel injector.
  16. Install the NEW fuel injector spacer (1).
    17. NOTE:

    Lubricate the NEW fuel injector O-ring with clean engine oil.

  17. Install the NEW fuel injector O-ring.
  18. GM2742599Courtesy of GENERAL MOTORS COMPANY

    Install the fuel injector holding clamp (2) onto the rear of the fuel injector.

  19. Hand install the fuel injector (1) to the fuel injection fuel rail, carefully aligning the fuel injector tab to the slot in the fuel rail (3).
  20. GM2742603Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fuel injector MUST be fully installed and properly aligned with the fuel injection fuel rail before installing the retaining pin.

    Use the EN-50791  installer (3) to compress the fuel injector (1) into the fuel injection fuel rail.

  21. Ensure the fuel injector is fully seated in the fuel injection fuel rail and install the fuel injector retaining pin (4).
  22. Ensure the fuel injector retaining pin is fully seated in the fuel injector fuel rail and remove EN-50791  installer.
  23. Repeat the process until all fuel injectors are properly installed to the fuel rail.
  24. GM2742605Courtesy of GENERAL MOTORS COMPANY

    Connect the electrical connectors (1) to the fuel injectors.

  25. GM2742606Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT use any type of lubricant when installing the NEW fuel injector seals on the fuel injector tip.

    Install the EN-51105 - 1  long protector (2) onto the fuel injector tip.

  26. Place a NEW fuel injector seal (1) onto the EN-51105 - 1  long protector.
  27. Use the EN-49245  pusher to install the NEW fuel injector seal into the second recessed area (3) of the fuel injector.
  28. Remove the EN-51105 - 1  long protector.
  29. Compress the NEW fuel injector seal with your fingers, then resize the seal using the EN-49245  pusher (4).
    30. NOTE:

    Do NOT use any type of lubricant when installing the NEW fuel injector seals on the fuel injector tip.

  30. Install the EN-51105 - 2  short protector (2) onto the fuel injector tip.
  31. Place a NEW fuel injector seal (1) onto the EN-51105 - 2  short protector.
  32. Use the EN-49245  pusher to install the NEW fuel injector seal into the remaining recessed area of the fuel injector.
  33. Remove the EN-51105 - 2  short protector.
  34. Compress the NEW fuel injector seal with your fingers, then resize the seal using the EN-49245  pusher (4).
  35. Fuel Injection Fuel Rail - Install - Fuel Injection Fuel Rail Assembly Replacement 
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