GM Service Manual Online
For 1990-2009 cars only

Intake Manifold Replacement Upper - VIN K

Removal Procedure

    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.

  1. Disconnect the negative battery cable.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  3. Remove the air intake duct.
  4. Disconnect the spark plug wires from the right side of the engine. Set the wires aside.
  5. Remove the manifold vacuum source.
  6. Depressurize the fuel lines.
  7. Disconnect the fuel injector wire harness from the fuel injectors.
  8. Remove the fuel rail.
  9. Remove the EGR heat shield.
  10. Remove the cable bracket to the cylinder head mounting bolt.
  11. Remove the throttle cable.
  12. Remove the throttle body support bracket.
  13. Notice: The two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake is removed. The bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.


    Object Number: 42225  Size: SH
  14. Remove the upper intake manifold bolts.
  15. Remove the upper intake manifold.

Installation Procedure

    Notice: The two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake is removed. The bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.


    Object Number: 49828  Size: SH
  1. Install the upper intake manifold.
  2. 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 upper intake manifold bolts.
  4. Tighten
    Tighten the bolts in sequence to 10 N·m (89 lb in).

  5. Install the throttle body support bracket.
  6. Install the throttle body cable.
  7. Install the cable bracket to the cylinder head mounting bolt.
  8. Install the EGR heat shield.
  9. Install the fuel rail.
  10. Connect the fuel injector wire harness to the fuel injectors.
  11. Install the manifold vacuum source.
  12. Connect the spark plug wire to the right side of the engine.
  13. Install the air intake duct.
  14. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  15. 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.

    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.

  1. Disconnect the negative battery cable.
  2. Remove the upper intake manifold. Refer to Intake Manifold Replacement .
  3. Drain the cooling system. Refer to Cooling System Draining and Filling .
  4. Remove the upper radiator hose.
  5. Remove the generator.
  6. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
  7. Remove the EGR valve outlet pipe.

  8. Object Number: 35806  Size: SH
  9. Remove the lower intake manifold bolts.
  10. 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 thread locking compound GM P/N 12345739 or equivalent to the intake manifold bolt threads before assembly.

    Object Number: 35806  Size: SH
  1. Install the lower intake manifold.

  2. Object Number: 44774  Size: SH

    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 lower intake manifold bolts.
  4. Tighten
    Tighten the bolts in sequence to 15 N·m (11 lb ft).

  5. Connect the negative battery cable.
  6. Install the EGR valve outlet pipe.
  7. Install the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
  8. Install the generator.
  9. Install the upper radiator hose.
  10. Fill the cooling system. Refer to Cooling System Draining and Filling .
  11. Install the upper intake manifold. Refer to Intake Manifold Replacement .
  12. Connect the negative battery cable.

Intake Manifold Replacement VIN 1

Removal Procedure

    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.

  1. Disconnect the negative battery cable.
  2. Raise the vehicle. Suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the front splash shield.
  4. Drain the coolant.
  5. Close the radiator drain cock.
  6. Install the front splash shield.
  7. Lower the vehicle.
  8. Remove the supercharger. Refer to Supercharger Replacement .
  9. Remove the thermostat housing.

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

  13. Object Number: 63406  Size: SH
  14. 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 thread locking compound GM P/N 12345739 or equivalent to the intake manifold bolts.


    Object Number: 63406  Size: SH
  1. Install the intake manifold.
  2. 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 intake manifold bolts.
  4. Tighten
    Tighten the intake manifold bolts to 15 N·m (11 lb ft).

  5. Install the electrical connector at the temperature sensor.

  6. Object Number: 35812  Size: SH
  7. Install the EGR tube to the intake manifold.
  8. Install the thermostat housing.
  9. Install the supercharger. Refer to Supercharger Replacement
  10. Refill the coolant.
  11. Connect the negative battery cable.