GM Service Manual Online
For 1990-2009 cars only

Intake Manifold Disassemble Upper


    Object Number: 68506  Size: SH
  1. Remove the ignition coil bolt and stud.
  2. Remove the ignition coil.

  3. Object Number: 18299  Size: SH
  4. Remove the throttle body nuts.

  5. Object Number: 18302  Size: SH
  6. Remove the throttle body.

  7. Object Number: 18303  Size: SH
  8. Remove the throttle body gasket.
  9. Remove the throttle body studs, if required.

  10. Object Number: 276413  Size: SH

    Important: Note the position of the EGR valve before removal. It is possible to improperly install the EGR valve 180 degrees from the original position.

  11. Remove the EGR valve bolts.
  12. Notice: The Linear EGR valve is an electrical component. DO NOT soak in any liquid cleaner or solvent because damage may result.

  13. Remove the EGR valve.
  14. Remove the EGR gasket.

  15. Object Number: 351775  Size: SH
  16. Remove the EVAP purge valve bolts.
  17. Remove the EVAP purge valve.

  18. Object Number: 354044  Size: SH
  19. Remove the secondary air injection check valve bracket stud and secondary air injection check valve bracket (RPO K19 only), if required .

  20. Object Number: 501418  Size: SH
  21. Remove the secondary air injection check valve bracket stud (without RPO K19), if required .

  22. Object Number: 492023  Size: SH
  23. Remove the ECT wiring harness connector bracket bolt and ECT wiring harness connector bracket, if required.

  24. Object Number: 492027  Size: SH
  25. Remove the accelerator control cable bracket bolt and stud, and accelerator control cable bracket, if required.

Intake Manifold Disassemble Lower


    Object Number: 501419  Size: SH
  1. Remove the oil fill tube, if required.

  2. Object Number: 19673  Size: SH
  3. Remove the MAP sensor retainer nut.
  4. Remove the MAP sensor retainer.
  5. Remove the MAP sensor.

  6. Object Number: 501422  Size: SH
  7. Disconnect the fuel injector regulator vacuum hose connection from the intake manifold fitting.

  8. Object Number: 492021  Size: SH
  9. Remove the fuel rail stud (1) and bolts (2, 3).
  10. Remove the fuel rail.

  11. Object Number: 65322  Size: SH
  12. Remove the coolant outlet housing bolts.
  13. Remove the coolant outlet housing.
  14. Remove the thermostat.

  15. Object Number: 492032  Size: SH
  16. Remove the ECT sensor, if required.

  17. Object Number: 492031  Size: SH
  18. Remove the thermostat bypass hose fitting, if required.