GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Regal (China) 🢒 Engine 🢒 Engine Exhaust 🢒 Exhaust Manifold Replacement - Right Side

Removal Procedure
  1. Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.

    2. Object Number: 69062 Size: SH
  2. Remove the throttle body air inlet duct.
  3. Remove the exhaust crossover pipe nuts to the right hand exhaust manifold. Refer to Exhaust Crossover Pipe Replacement .
  4. Disconnect the heated oxygen sensor (HO2S) wiring harness connector.
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  6. Disconnect the exhaust resonator or catalytic converter (if equipped) pipe from the right hand exhaust manifold. Refer to Resonator Replacement or Catalytic Converter Replacement in Engine Exhaust.

    7. Object Number: 543289 Size: SH
  7. Remove the exhaust gas recirculation (EGR) tube from the right hand exhaust manifold.

    8. Object Number: 499469 Size: SH
  8. Remove the right hand exhaust manifold upper heat shield bolts.
  9. Remove the right hand exhaust manifold upper heat shield.

    10. Object Number: 499475 Size: SH
  10. Remove the right hand exhaust manifold lower heat shield bolts.
  11. Remove the right hand exhaust manifold lower heat shield.

    12. Object Number: 499482 Size: SH
  12. Remove the right hand exhaust manifold nuts.
  13. Remove the right hand exhaust manifold.
  14. Remove the right hand exhaust manifold gasket.
  15. Clean the right hand exhaust manifold to the right hand cylinder head sealing surfaces.

    16. Object Number: 190526 Size: SH
  16. If replacing the exhaust manifold remove the heated oxygen sensor (HO2S).

Installation Procedure

    Object Number: 499482 Size: SH
  1. Install the right hand exhaust manifold gasket.
  2. Install the right hand exhaust manifold.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the right hand exhaust manifold nuts.

    4. Tighten
    Tighten the right hand exhaust manifold bolts to 16 N·m (12 lb ft).


    Object Number: 543289 Size: SH
  4. Install the exhaust gas recirculation (EGR) tube from the right hand exhaust manifold.

    5. Object Number: 499475 Size: SH
  5. Install the right hand exhaust manifold lower heat shield.
  6. Install the right hand exhaust manifold lower heat shield bolts.

    7. Tighten
    Tighten the right hand exhaust manifold lower heat shield bolts to 10 N·m (89 lb in).


    Object Number: 499469 Size: SH
  7. Install the right hand exhaust manifold upper heat shield.
  8. Install the right hand exhaust manifold upper heat shield bolts.

    9. Tighten
    Tighten the right hand exhaust manifold upper heat shield bolts to 10 N·m (89 lb in).

  9. Connect the exhaust resonator or catalytic converter (if equipped) pipe to the right hand exhaust manifold. Refer to Resonator Replacement or Catalytic Converter Replacement in Engine Exhaust.
  10. Connect the heated oxygen sensor (HO2S) electrical connection.
  11. Lower the vehicle.
  12. Install the exhaust crossover pipe nuts to the right hand exhaust manifold. Refer to Exhaust Crossover Pipe Replacement .

    13. Object Number: 69062 Size: SH
  13. Install the throttle body air inlet duct.
  14. Connect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.