GM Service Manual Online
For 1990-2009 cars only

Upper Intake Manifold Removal C, H, W


    Object Number: 638520  Size: SH
  1. Remove the spark plug wires.
  2. Disconnect the ignition wires from the fuel injector rail.
  3. Disconnect the ignition control module connector from the ignition control module assembly.
  4. Remove the ignition control module assembly nuts.
  5. Remove the ignition control module assembly.

  6. Object Number: 153568  Size: SH
  7. Remove the fuel injector rail nuts.
  8. Remove the fuel injector rail.

  9. Object Number: 192745  Size: SH
  10. Remove the accelerator control cable bracket bolts.
  11. Remove the accelerator control cable bracket from the intake manifold.

  12. Object Number: 211908  Size: SH
  13. Remove the engine wiring harness heat shield bolt and nut.
  14. Remove the engine wiring harness heat shield.

  15. Object Number: 153566  Size: SH
  16. Remove the throttle body nuts.
  17. Remove the throttle body.
  18. Remove the throttle body gasket.

  19. Object Number: 42225  Size: SH
  20. Remove the upper intake manifold bolts and nuts.
  21. Remove the upper intake manifold.

Upper Intake Manifold Removal F


    Object Number: 403772  Size: SH
  1. Remove the spark plug wires.
  2. Remove the manifold vacuum source.
  3. Remove the EGR outlet pipe bolt and nut.
  4. Remove the EGR outlet pipe from the intake manifold.
  5. Important: The two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake is removed. The bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.


    Object Number: 403776  Size: SH
  6. Remove the throttle body nuts and bolt.
  7. Remove the throttle body.
  8. Remove the throttle body gasket.

  9. Object Number: 403779  Size: SH
  10. Remove the fuel injectior rail nuts.
  11. Remove the fuel injector rail.

  12. Object Number: 403782  Size: SH
  13. Remove the upper intake manifold bolts.
  14. Remove the upper intake manifold.
  15. Remove the upper intake manifold gasket.