GM Service Manual Online
For 1990-2009 cars only

Intake Manifold Replacement Upper

Removal Procedure

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in General Information.
  2. Remove the fuel injector sight shield. Remove the air intake duct.
  3. Disconnect the spark plug wires from the right side of the engine.
  4. Remove the manifold vacuum source.
  5. Depressurize the fuel lines.

  6. Object Number: 55742  Size: SH
  7. Remove the fuel rail.
  8. Remove the EGR heat shield.
  9. Remove the cable bracket to the cylinder head mounting bolt.
  10. Remove the throttle cable.

  11. Object Number: 42225  Size: SH
  12. Remove the throttle body support bracket.
  13. Remove the upper intake manifold.

Installation Procedure


    Object Number: 42225  Size: SH
  1. Install the upper intake manifold.
  2. Install the upper intake manifold bolts.
  3. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

    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.

  4. Install the throttle body support bracket.
  5. Install the throttle body cable.
  6. Install the cable bracket to the cylinder head mounting bolt.
  7. Install the EGR heat shield.

  8. Object Number: 55742  Size: SH
  9. Install the fuel rail.
  10. Install the manifold vacuum source.
  11. Connect the spark plug wire to the right side of the engine.
  12. Install the fuel injector sight shield. Install the air intake duct.
  13. Connect the negative battery cable.

Intake Manifold Replacement Lower VIN 1

Removal Procedure

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in General Information.
  2. Raise the vehicle.
  3. Remove the front splash shield.
  4. Drain the coolant.
  5. Close the radiator drain cock. Install the front splash shield.
  6. Lower the vehicle.
  7. Remove the supercharger. Refer to Supercharger Removal .
  8. Remove the thermostat housing. Refer to Coolant Outlet Housing and Thermostat Removal .

  9. Object Number: 35812  Size: SH
  10. Remove the EGR tube at the intake manifold.
  11. Remove the electrical connection at the temperature sensor.

  12. Object Number: 35806  Size: SH
  13. Remove the intake manifold.

Installation Procedure

Important: In order to install the manifold, complete the following steps:

   • Use a suitable solvent in order to clean all oil from the cylinder block, the cylinder heads, and the intake manifold sealing surface.
   • Apply a GM approved sealer to the ends of the intake manifold seals.
   • Clean any adhesive compound from the intake manifold bolts and the bolt holes.
   • Apply a GM approved thread locking compound to the intake manifold bolts.


    Object Number: 35806  Size: SH
  1. Install the intake manifold.
  2. Install the intake manifold bolts.
  3. Tighten
    Tighten the intake manifold bolts in sequence to 15 N·m (11 lb ft).

    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.

  4. Install the electrical connector at the temperature sensor.

  5. Object Number: 35812  Size: SH
  6. Install the EGR tube to the intake manifold.
  7. Install the thermostat housing. Refer to Coolant Outlet Housing and Thermostat Removal .
  8. Install the supercharger. Refer to Supercharger Removal .
  9. Refill the coolant. Refer to Cooling System Draining and Filling
  10. Connect the negative battery cable.

Intake Manifold Replacement Lower VIN K

Removal Procedure

    Notice: Engine Code K has two bolts which are hidden beneath the upper intake. These bolts are located in the right front and left rear corners of the lower intake manifold. It is necessary to remove the upper intake manifold to service the lower intake.

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in General Information.
  2. Remove the upper intake manifold. Refer to Intake Manifold Removal .
  3. Drain the cooling system.
  4. Remove the upper radiator hose.
  5. Remove the generator.
  6. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Installation .

  7. Object Number: 36667  Size: SH
  8. Remove the EGR valve outlet pipe.

  9. Object Number: 35806  Size: SH
  10. Remove the lower intake manifold bolts.
  11. Remove the lower intake manifold.

Installation Procedure

Important: In order to complete the installation, observe the following assembly tips:

    • Clean the cylinder block, heads and the intake manifold sealing surface of all oil with a suitable solvent.
    • Clean the intake manifold bolts and bolt holes of adhesive compound.
    • Apply GM approved thread locking compound to the intake manifold bolt threads before assembly.

    Object Number: 35806  Size: SH
  1. Install the lower intake manifold.
  2. Install the lower intake manifold bolts.
  3. Tighten
    Tighten the bolts in sequence to 15 N·m (11 lb ft).

    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.

  4. Connect the negative battery cable.

  5. Object Number: 36667  Size: SH
  6. Install the EGR valve outlet pipe.
  7. Install the drive belt tensioner. Refer to Drive Belt Tensioner Installation .
  8. Install the generator. Refer to SECTION 6D3.
  9. Install the upper radiator hose.
  10. Fill the cooling system.
  11. Install the upper intake manifold. Refer to Intake Manifold Removal .