GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Caution: Refer to Gasoline/Gasoline Vapors Caution in the Preface section.


    Object Number: 1858085  Size: SH
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  2. Disconnect the engine wiring harness electrical connector (4) from the fuel injector wiring harness electrical connector (5).

  3. Object Number: 1860283  Size: SH
  4. Disconnect the fuel feed pipe (2) quick connect fitting from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  5. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement .
  6. Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.


    Object Number: 1860295  Size: SH
  7. Use compressed air in order to remove any debris from the around the area where the fuel injectors enter the lower intake manifold.
  8. Remove the fuel rail bolts.
  9. Notice: 

       • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
       • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.

  10. Remove the fuel rail with fuel injectors from the lower intake manifold.

  11. Object Number: 1850541  Size: SH
  12. Lift up the fuel injector electrical connector retainer (2).
  13. Push in the fuel injector electrical connector tab (1) in order to disconnect the connector from the injector.

  14. Object Number: 1285199  Size: SH
  15. Remove the fuel injector retainer clip.

  16. Object Number: 1285197  Size: SH
  17. Remove the fuel injector.
  18. Remove and discard the fuel injector seals.
  19. If replacing the fuel rail, disconnect the fuel injector wiring harness electrical connectors from the remaining injectors and repeat steps 10 thru 12 in order to remove the remaining injectors.

Installation Procedure


    Object Number: 1285197  Size: SH
  1. Install NEW fuel injector seals.
  2. Install the fuel injector.

  3. Object Number: 1285199  Size: SH
  4. Install the fuel injector retainer clip.

  5. Object Number: 1850541  Size: SH
  6. Install the fuel injector electrical connector.
  7. Push down on the fuel injector electrical connector retainer (2), securing the electrical connector.

  8. Object Number: 1860295  Size: SH
  9. Install the fuel rail with fuel injectors to the lower intake manifold.
  10. Notice: Refer to Fastener Notice in the Preface section.

  11. Install the fuel rail bolts.
  12. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1860283  Size: SH
  13. Install the upper intake manifold. Refer to Upper Intake Manifold Replacement .
  14. Connect the fuel feed pipe (2) quick connect fitting to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .

  15. Object Number: 1858085  Size: SH
  16. Connect the engine wiring harness electrical connector (4) to the fuel injector wiring harness electrical connector (5).
  17. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .