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Home >> Cadillac >> 2017 >> XTS Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.6L (LFX LF3) - Repair Instructions >> Repair Instructions >> Fuel Injector Replacement (LF3) >> Installation Procedure

Installation Procedure

    Fig 1: Identifying Fuel Injector Components
    GM2202046Courtesy of GENERAL MOTORS COMPANY
  1. Inspect the fuel injectors for the following conditions:
    • Damage to the fuel injector connector (1)
    • Damage to the fuel inlet cone (2)
    • Damage to the fuel injector body (3)
    • Damage to the fuel injector tip (4)
  2. Replace the fuel rail or injector if any damage is found. Do not attempt to repair a fuel rail or injector.
    3. Fig 2: Fuel Injector Bushing
    GM2915264Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The fuel injector bushing (1) is to be installed BEFORE O-ring or backup rings are installed.

  3. Install NEW fuel injector bushing (1) onto injector body. Bushing should seat with a distinct "snap" sound and feel. Ensure bushing is fully seated.
    4. Fig 3: Injector And Components
    GM2915265Courtesy of GENERAL MOTORS COMPANY
  4. Install the NEW white plastic spacer (3) on the fuel injector first.
    1. Install the brown plastic spacer (2) second.
    2. Lubricate the NEW O-ring (1) with clean engine oil and install.
    5. Fig 4: Injector Retainer
    GM2915262Courtesy of GENERAL MOTORS COMPANY
  5. Install NEW retainer (3) onto the fuel injector.
  6. Holding the largest diameter/body of the injector only, indicated by arrow in graphic, insert the injector assembly (1) into the fuel rail. Ensure correct orientation of the electrical connector (2).
  7. Rotate the fuel injector approximately 45 degrees until the tab on the retainer (4) locks into the notch on the fuel rail.
  8. Repeat for remaining injectors until all are installed and retained in fuel rail.
    9. Fig 5: View Of Fuel Rail Wiring Harness
    GM2202041Courtesy of GENERAL MOTORS COMPANY
  9. Install the fuel rail wiring harness (1).
    10. Fig 6: Identifying Fuel Injector Tip & Seals
    GM2210025Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT use any type of lubricant when installing the NEW seals (2) on the fuel injector tip.

  10. Install EN 49245-1  long protector (3) onto the fuel injector tip, covering the first recessed area closest to the tip. Place a NEW seal (2) on EN-49245-1  long protector.
  11. Using EN-49245-3  pusher (1), install the seal into the second recessed area (4) of the fuel injector.
    12. NOTE:

    The EN-49245-4  sizer is two sided, and either direction will size the seal correctly.

  12. Compress the seal with your fingers, then resize the seal using the EN-49245-4  sizer (5).
    13. Fig 7: Identifying Fuel Injector Tip & Seals
    GM2219104Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT use any type of lubricant when installing the NEW seals (2) on the fuel injector tip.

  13. Install EN-49245-2  short protector (3) onto the fuel injector tip. Place a NEW seal (2) on EN-49245-2  short protector.
  14. Using EN-49245-3  pusher (1), install the seal into the first recessed area (4) of the fuel injector.
    15. NOTE:

    The EN-49245-4  sizer is two sided, and either direction will size the seal correctly.

  15. Compress the seal with your fingers, then resize the seal using the EN-49245-4  sizer (5).
  16. Install the fuel injection fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LF3) , and/or Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LF3) .
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