GM Service Manual Online
For 1990-2009 cars only

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 negative battery cable.

  2. Object Number: 302854  Size: SH
  3. Disconnect the spark plug wires and ignition coil wire from the distributor.

  4. Object Number: 302829  Size: SH
  5. Disconnect the CMP sensor harness connector.

  6. Object Number: 4371  Size: SH
  7. Remove the distributor cap screws.

  8. Object Number: 157986  Size: SH
  9. Remove the distributor cap.

  10. Object Number: 301396  Size: SH
  11. Remove the rotor screws.
  12. Remove the rotor.

  13. Object Number: 4341  Size: SH
  14. Remove the CMP sensor retaining screws.

  15. Object Number: 156754  Size: SH
  16. Align the square slot in the reluctor wheel with the CMP sensor.

  17. Object Number: 423196  Size: SH
  18. Remove the camshaft position sensor.

Installation Procedure

Important: Do not use the old cap, CMP sensor, and rotor screws. Use replacement screws that have been coated with a thread locking compound. Precoated replacement distributor cap and CMP sensor screws can be acquired using P/N 10475922. Precoated replacement rotor screws can be acquired using P/N 10475924.


    Object Number: 156754  Size: SH
  1. Align the square slot in the reluctor wheel with CMP sensor.

  2. Object Number: 423196  Size: SH
  3. Insert the CMP sensor through the reluctor wheel slot.

  4. Object Number: 4341  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.

  5. Install the Camshaft Position (CMP) Sensor retaining screws.
  6. Tighten
    Tighten the screw to 5 N·m (45 lb in).


    Object Number: 301396  Size: SH
  7. Install the rotor onto the reluctor wheel.
  8. Install new rotor screws.
  9. Tighten
    Tighten the screw to 2 N·m (18 lb in).


    Object Number: 157986  Size: SH
  10. Install the distributor cap.
  11. Tighten
    Tighten the screw to 2.4 N·m (20 lb in).


    Object Number: 302829  Size: SH
  12. Connect the CMP sensor harness connector.

  13. Object Number: 302854  Size: SH
  14. Connect the spark plug wires and ignition coil wire.
  15. Connect the negative battery cable.