GM Service Manual Online
For 1990-2009 cars only

    Object Number: 880571  Size: SH
  1. Install the intake manifold, fitting the plenum duct over the intake manifold duct.

  2. Object Number: 522669  Size: SH
  3. Loosely install the intake manifold bolts.
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 797947  Size: SH
  5. Tighten the intake manifold bolts in sequence (1-10).
  6. Tighten
    Tighten the intake manifold bolts to 10 N·m (89 lb in).


    Object Number: 522666  Size: SH
  7. Tighten the plenum duct clamp (1) to the intake manifold.
  8. Tighten
    Tighten the plenum duct clamp to 2.75 N·m (24 lb in).


    Object Number: 522658  Size: SH
  9. Inspect the fuel injector O-rings. Ensure the fuel injector O-rings are not missing, mis-aligned or damaged. Replace the O-rings if necessary.
  10. Lubricate the intake manifold fuel injector bores with light mineral oil GM P/N 9981704, clean engine oil, or equivalent.
  11. Install the fuel rail with fuel injectors as an assembly.
  12. Install the fuel rail studs.
  13. Tighten
    Tighten the fuel rail studs to 9 N·m (80 lb in).


    Object Number: 522654  Size: SH
  14. Install the fuel rail bracket nut to the engine lift bracket.
  15. Tighten
    Tighten the fuel rail bracket nut to 10 N·m (89 lb in).


    Object Number: 490817  Size: SH
  16. Install the fuel injector wiring harness.
  17. Connect the fuel injector electrical connectors (1) to the fuel injectors.

  18. Object Number: 798638  Size: SH
  19. Install the PCV dirty air tube to the PCV orifice in the right camshaft cover and to the intake manifold.

  20. Object Number: 522644  Size: SH
  21. Install the PCV fresh air feed tube to the camshaft cover and the water crossover.

  22. Object Number: 522641  Size: SH
  23. Install the fuel pressure regulator vacuum tube to the fuel pressure regulator and the throttle body.

  24. Object Number: 522640  Size: SH
  25. Install the brake booster hose to the throttle body.