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

Removal Procedure

Tools Required
    • J 34730 Fuel Pressure Gauge
    • J 41081 Fuel Injector Remover

    Object Number: 18881 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Disconnect the fuel injector electrical connector to vehicle harness.
  3. Disconnect the fuel pressure regulator vacuum hose.
  4. Disconnect the fuel rail ground wire strap at the rear cylinder head.

    5. Object Number: 198301 Size: SH
  5. Release the fuel rail to intake manifold locking tab (8) by pushing toward center of intake manifold.

    6. Object Number: 18886 Size: SH
  6. Pry the injector up out of intake manifold using J 41081 between the bottom of injector and intake manifold.

    7. Object Number: 198301 Size: SH
  7. Spread the injector retainer clip (3) to release injector from fuel rail.

    8. Object Number: 168577 Size: SH

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

  8. Remove the fuel injector assembly (1).

Installation Procedure

    Object Number: 168577 Size: SH
  1. Lubricate the new upper (3) and lower injector (2) O-rings with clean engine oil.
  2. Install the O-rings on the injector.
  3. Install the new retainer clip on to the injector.
  4. Install the fuel injector into fuel rail.
  5. Push the fuel injector in far enough to engage retainer clip with machined slots on rail socket.
  6. A snap will be heard when the injectors on the fuel rail are fully seated.

    7. Object Number: 18881 Size: SH
  7. Push the fuel rail down onto the intake manifold until the locks latch.
  8. Install the injector electrical connector.

    9. Object Number: 153705 Size: SH
  9. Tighten the fuel filler cap (1).
  10. Install the negative battery cable.
  11. Inspect for fuel leaks.
    12. 11.1. Turn ignition switch to On position for 2 seconds.
    11.2. Turn the ignition switch OFF for 10 seconds.
    11.3. Turn the ignition switch ON.
    11.4. Check for fuel leaks.

    Object Number: 42751 Size: SH
  12. Install the rear seat cushion. Refer to Rear Seat Cushion Replacement .

    13. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  13. Install the intake manifold top cover.

    14. Tighten
    Tighten the intake manifold top cover to 3 N·m (27 lb in).