GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Allure 🢒 Engine 🢒 Engine Mechanical - 3.6L (LY7) 🢒 Lower Intake Manifold Replacement

Removal Procedure

    Object Number: 1394073 Size: SH
  1. Turn the ignition OFF.
  2. Remove the air inlet duct. Refer to Air Cleaner Inlet Duct Replacement .
  3. Remove the fuel pressure and evaporative emission (EVAP) hoses from the engine. Refer to Metal Collar Quick Connect Fitting Service and Plastic Collar Quick Connect Fitting Service .
  4. Disconnect the BARO sensor electrical connector.

    5. Important: Do not disconnect the engine control module (ECM) electrical connectors.

  5. Remove the ECM bracket with the ECM and reposition aside. Refer to Engine Control Module Replacement .
  6. Disconnect the purge solenoid electrical connector.
  7. Disconnect the purge solenoid electrical connector.

    8. Object Number: 1394052 Size: SH
  8. Remove the wiring harness from the right side of the intake manifold.

    9. Object Number: 1394055 Size: SH
  9. Disconnect the fuel injector electrical connector.

    10. Object Number: 1394050 Size: SH
  10. Remove the throttle body electrical connector.
  11. Remove the brake booster vacuum hose and check valve from the brake booster.

    12. Object Number: 1394081 Size: SH
  12. Remove the positive crankcase ventilation (PCV) hose from the intake manifold.

    13. Object Number: 1401464 Size: SH
  13. Remove the intake manifold bolts (1-6).

    14. Object Number: 1394084 Size: SH
  14. Remove the intake manifold.
  15. Disassemble the intake manifold as necessary. Refer to Intake Manifold Disassemble .
  16. Clean and inspect the intake manifold and the sealing surfaces. Refer to Intake Manifold Cleaning and Inspection .

Installation Procedure
  1. Assemble the intake manifold as necessary. Refer to Intake Manifold Assemble .

    2. Object Number: 1394084 Size: SH
  2. Install the intake manifold. Refer to Intake Manifold Installation .

    3. Object Number: 1394081 Size: SH
  3. Install the PCV hose to the intake manifold.
  4. Install the brake booster vacuum hose and check valve to the brake booster.

    5. Object Number: 1394050 Size: SH
  5. Install the throttle body electrical connector.

    6. Object Number: 1394055 Size: SH
  6. Connect the fuel injector electrical connector.

    7. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1394052 Size: SH
  7. Install the wiring harness to the right side of the intake manifold.

    8. Tighten
    Tighten the wiring harness bracket bolts to 10 N·m (89 lb in).


    Object Number: 1394073 Size: SH
  8. Connect the purge solenoid electrical connector.
  9. Install the ECM bracket with the ECM. Refer to Engine Control Module Replacement .
  10. Connect the BARO sensor electrical connector.
  11. Install the fuel pressure and EVAP hoses to the engine. Refer to Metal Collar Quick Connect Fitting Service and Plastic Collar Quick Connect Fitting Service .
  12. Install the air inlet duct. Refer to Air Cleaner Inlet Duct Replacement .