GM Service Manual Online
For 1990-2009 cars only

Fuel Injector and Fuel Rail Replacement LP1, LY7

Removal Procedure

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

  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief.
  2. Remove the upper intake manifold with the lower intake manifold. Refer to Upper Intake Manifold Replacement.

  3. Object Number: 1348200  Size: SH
  4. Remove the fuel pipe retaining clip.

  5. Object Number: 1348201  Size: SH
  6. Disconnect the fuel feed pipe (2) from the fuel injector rail. Refer to Metal Collar Quick Connect Fitting Service.
  7. Warning: Refer to Safety Glasses and Compressed Air Warning in the Preface section.

  8. Use compressed air in order to remove debris from the area where the fuel injectors enter the intake manifold.

  9. Object Number: 1285194  Size: SH
  10. Remove the fuel rail bolts.
  11. Caution: 

       • 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.

  12. Remove the fuel rail with the fuel injectors.

  13. Object Number: 1285196  Size: SH
  14. Disengage the fuel injector electrical connector lock.

  15. Object Number: 1285198  Size: SH
  16. Disconnect the fuel injector electrical connector.

  17. Object Number: 1285199  Size: SH
  18. Remove the fuel injector retainer clip.

  19. Object Number: 1285197  Size: SH
  20. Remove the fuel injector.
  21. Remove and discard the fuel injector seals.

Installation Procedure

  1. Install NEW fuel injector seals.

  2. Object Number: 1285197  Size: SH
  3. Install the fuel injector.

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

  6. Object Number: 1285198  Size: SH
  7. Install the fuel injector electrical connector.
  8. Engage the fuel injector electrical connector lock.

  9. Object Number: 1285194  Size: SH
  10. Install the fuel rail with the fuel injectors.
  11. Caution: Refer to Fastener Caution in the Preface section.

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


    Object Number: 1348201  Size: SH
  14. Connect the fuel feed pipe (2) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service.

  15. Object Number: 1348198  Size: SH
  16. Install the fuel pipe retaining clip.
  17. Install the upper intake manifold. Refer to Upper Intake Manifold Replacement.