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Home >> Cadillac >> 2021 >> CT4 V, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.7L (L3B) - Repair Instructions - Ct4 (6 Of 6) >> Engine Replacement (AWD) >> Cleaning and Inspection Procedure - Required

Cleaning and Inspection Procedure - Required

  1. GM5896300Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do not soak or submerge the fuel pump in solvent.

    Clean the fuel pump (2) and valve lifter follower (5).

    2. WARNING:

    Refer to SAFETY GLASSES AND COMPRESSED AIR WARNING

  2. Dry the fuel pump and valve lifter follower with compressed air.
  3. Inspect the fuel pump for the following conditions:
    1. Damage to the connection ports (1)
    2. Damage to the electrical connector (2)
    3. Damage to the sealing surface (3)
    4. Damage to or a bent or binding plunger (7)
    5. Damage to the mounting holes (8)
  4. Inspect the valve lifter follower for the following conditions:
    1. A scored or worn fuel pump contact surface (4)
    2. A severely scuffed or worn body (5)
    3. Binding or roughness of the roller (6)
  5. If any of the above conditions exist, replace the fuel pump and/or the valve lifter follower.
  6. Clean the fuel injector bores.
  7. GM5064714Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do not soak or submerge the fuel rail or injectors in solvent.

    Clean the exterior of the fuel rail (1) with a clean cloth and solvent.

  8. Inspect the 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 or mounting bolt grommets/isolators
    • Damage to the threads on the fuel rail feed fitting
    • Damage to the threads in the fuel pressure sensor bore
    • Damage to the fuel pressure sensor connector, threads, or sealing face
  9. GM5064713Courtesy of GENERAL MOTORS COMPANY

    Inspect the fuel injectors for the following conditions:

    CAUTION:

    The fuel injector must be cleaned with the proper cleaning equipment. DO NOT use abrasive cleaning methods, such as a metallic brush, to remove deposits. Cleaning an injector with improper tools will damage the fuel injector.

    • Damage to the fuel injector connector (1)
    • Damage to the fuel inlet (2)
    • Damage to the sealing surface on the fuel injector (3)
    • Damage to the fuel injector body (4)
    • Damage to the fuel injector tip (5)
  10. Replace the fuel rail or injector if any damage is found. Do not attempt to repair a fuel rail or injector.
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