GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Eldorado 🢒 Engine 🢒 Engine Controls - 4.0L and 4.6L 🢒 Fuel Injector Replacement

Tools Required
    • J 34730-1A Fuel Pressure Gauge
    • J 41081 Injector Remover

Removal Procedure

    Object Number: 180378 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .

    2. Object Number: 18886 Size: SH
  2. Disconnect the fuel injector electrical connector.
  3. Release the fuel rail to intake manifold locking tab by pushing toward center of intake manifold.
  4. Remove the fuel injector up out of intake manifold using J 41081 between the bottom of injector and intake manifold.

    5. Object Number: 254319 Size: SH

    Important: It may be necessary to release the adjacent injector(s) from the intake manifold to allow increased fuel rail movement for injector access.

  5. Spread the injector retainer clip (10) to release injector from fuel rail.

    6. Object Number: 168577 Size: SH
  6. Remove the fuel injector assembly (1).
  7. Remove the upper (3) and lower (2) injector O-rings seals from the injector.
  8. Discard the injector O-ring seals.

Installation Procedure

    Object Number: 254319 Size: SH

    Caution: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always install the fuel injector O-rings in the proper position. If the upper and lower O-rings are different colors (black and brown), be sure to install the black O-ring in the upper position and the brown O-ring in the lower position on the fuel injector. The O-rings are the same size but are made of different materials.

  1. Lubricate the new upper (11) and lower (13) O-rings with clean engine oil.
  2. Install the new upper (11) and lower injector (13) O-rings on the injector (12).
  3. Install the fuel injector (12) into fuel rail.
    4. • Ensure injectors are aligned by orientating electrical connector perpendicular to crankshaft.
    • Push in the retainer clip (10) far enough to engage retainer clip with machined slots on rail socket.

    Object Number: 18886 Size: SH
  4. Snap the fuel rail down on to intake manifold.
  5. Connect the fuel injector electrical connector.
  6. Add fuel to the fuel tank.
  7. Tighten the fuel filler cap.
  8. Connect the negative battery cable.
  9. Inspect for fuel leaks.
    10. 9.1. Turn ignition switch ON position for 2 seconds.
    9.2. Turn the ignition switch OFF for 10 seconds
    9.3. Turn the ignition switch ON.
    9.4. Check for fuel leaks.
  10. Reinstall the intake manifold sight shield. Refer to Intake Manifold Removal in engine mechanical.