GM Service Manual Online
For 1990-2009 cars only

Intake Manifold Replacement LE5

Removal Procedure


    Object Number: 1571757  Size: SH
  1. Remove the throttle body. Refer to Throttle Body Assembly Replacement.
  2. Remove the fuel rail. Refer to Fuel Injection Fuel Rail Assembly Replacement.
  3. Remove the evaporative emission (EVAP) canister purge solenoid valve tube. Refer to Plastic Collar Quick Connect Fitting Service.

  4. Object Number: 1571772  Size: SH
  5. Reposition the brake booster vacuum hose clamp at the intake manifold.
  6. Remove the brake booster hose from the intake manifold.
  7. Remove the oil level indicator tube bolt.

  8. Object Number: 1571760  Size: SH
  9. Disconnect the engine harness electrical connector (1) from the fuel injector inline electrical connector (2).
  10. Remove the fuel injector inline connector clip from the intake manifold.

  11. Object Number: 1571236  Size: SH
  12. Disconnect the engine harness electrical connector (1) from the knock sensor harness.
  13. Remove the knock sensor connector clip from the oil level indicator tube.

  14. Object Number: 1571773  Size: SH
  15. Remove the intake manifold bolts and nuts.
  16. Remove the intake manifold.
  17. Note: The intake manifold gasket is reusable. Only replace the gasket if damage has occurred.

  18. Remove the intake manifold gasket, if necessary.

Installation Procedure


    Object Number: 1571773  Size: SH
  1. Install the intake manifold gasket, if necessary.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the intake manifold.
  4. Install the intake manifold bolts and nuts and tighten to 10 N·m (89 lb in).

  5. Object Number: 1571236  Size: SH
  6. Connect the engine harness electrical connector (1) to the knock sensor harness.
  7. Install the knock sensor connector clip to the oil level indicator tube.

  8. Object Number: 1571760  Size: SH
  9. Connect the engine harness electrical connector (1) to the fuel injector inline electrical connector (2).
  10. Install the fuel injector inline connector clip to the intake manifold.
  11. Install the oil level indicator tube bolt and tighten to 10 N·m (89 lb in).

  12. Object Number: 1571772  Size: SH
  13. Install the brake booster hose to the intake manifold.
  14. Position the brake booster vacuum hose clamp at the intake manifold.

  15. Object Number: 1571757  Size: SH
  16. Install the EVAP canister purge solenoid valve tube. Refer to Plastic Collar Quick Connect Fitting Service.
  17. Install the fuel rail. Refer to Fuel Injection Fuel Rail Assembly Replacement.
  18. Install the throttle body. Refer to Throttle Body Assembly Replacement.

Intake Manifold Replacement LAT

Removal Procedure


    Object Number: 1810743  Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  2. Remove the radiator inlet hose. Refer to Radiator Inlet Hose Replacement.
  3. Disconnect the engine wiring harness electrical connector (1) from the throttle actuator control (TAC).
  4. Disconnect the engine wiring harness electrical connector (2) from the generator starter.
  5. Disconnect the engine wiring harness electrical connector (4) from the generator starter.
  6. Remove the fuel injector wiring harness electrical connector retainer (6) from the generator starter.
  7. Disconnect the fuel injector wiring harness electrical connector (7) from the engine wiring harness electrical connector (8).
  8. Remove the engine wiring harness clips (5) from the intake manifold.

  9. Object Number: 1999023  Size: SH
  10. Reposition the vacuum brake booster hose clamp (1) at the intake manifold.
  11. Remove the vacuum brake booster hose (2) from the intake manifold.
  12. Remove the throttle body. Refer to Throttle Body Assembly Replacement.
  13. Disconnect the engine wiring harness electrical connector from the manifold absolute pressure (MAP) sensor.

  14. Object Number: 1623766  Size: SH
  15. Disconnect the evaporative emission (EVAP) canister purge tube from the intake manifold and the EVAP solenoid. Refer to Plastic Collar Quick Connect Fitting Service.
  16. Remove the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement.
  17. Remove the fuel rail. Refer to Fuel Injection Fuel Rail Assembly Replacement.

  18. Object Number: 1999107  Size: SH
  19. Remove the 3-phase voltage cable bracket bolt (1) at the oil level indicator tube.

  20. Object Number: 1810870  Size: SH
  21. Remove the generator starter bolts.
  22. Reposition and secure the generator starter out of the way.

  23. Object Number: 1623769  Size: SH
  24. Remove the intake manifold lower bolts (1).

  25. Object Number: 1656110  Size: SH
  26. Remove the intake manifold upper bolt and nuts.
  27. Remove the intake manifold.
  28. Note: The intake manifold gasket is reusable, only replace the gasket if damage has occurred.

  29. Remove and inspect the intake manifold gasket.

Installation Procedure


    Object Number: 1656110  Size: SH
  1. Install a NEW intake manifold gasket if necessary, otherwise install the old gasket.
  2. Install the intake manifold.
  3. Install the intake manifold upper bolt and nuts.
  4. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1623769  Size: SH
  5. Install the intake manifold lower bolts (1). Tighten the bolts/nuts (1) to 10 N·m (89 lb in).

  6. Object Number: 1810870  Size: SH
  7. Position the starter/generator to the bracket.
  8. Install the starter/generator bolts until snug.
  9. Tighten the starter generator bolts in the following sequence:
  10. 7.1. Front
    7.2. Bottom

    Tighten the bolts to 58 N·m (43 lb ft).


    Object Number: 1999107  Size: SH
  11. Install the 3-phase voltage cable bracket to the tie bar.
  12. Install the 3-phase voltage cable bracket bolt (1) at the oil level indicator tube. Tighten the bolt to 10 N·m (89 lb in).

  13. Object Number: 1623766  Size: SH
  14. Install the fuel rail. Refer to Fuel Injection Fuel Rail Assembly Replacement.
  15. Install the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement.
  16. Connect the EVAP canister purge tube to the intake manifold and the EVAP solenoid. Refer to Plastic Collar Quick Connect Fitting Service.
  17. Connect the engine wiring harness electrical connector to the MAP sensor.
  18. Install the throttle body. Refer to Throttle Body Assembly Replacement.

  19. Object Number: 1999023  Size: SH
  20. Install the vacuum brake booster hose (2) to the intake manifold.
  21. Position the vacuum brake booster hose clamp (1) at the intake manifold.

  22. Object Number: 1810743  Size: SH
  23. Install the engine wiring harness clips (5) to the intake manifold.
  24. Connect the fuel injector wiring harness electrical connector (7) to the engine wiring harness electrical connector (8).
  25. Install the fuel injector wiring harness electrical connector retainer (6) to the generator starter.
  26. Connect the engine wiring harness electrical connector (4) to the generator starter.
  27. Connect the engine wiring harness electrical connector (2) to the generator starter.
  28. Connect the engine wiring harness electrical connector (1) to the TAC.
  29. Install the radiator inlet hose. Refer to Radiator Inlet Hose Replacement.
  30. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.