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 the negative battery cable.
  2. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.

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

  5. Object Number: 302829  Size: SH
  6. Disconnect the CMP harness connector from the distributor.

  7. Object Number: 157984  Size: SH
  8. Remove the distributor cap screws.

  9. Object Number: 4372  Size: SH
  10. Remove the distributor cap.

  11. Object Number: 4354  Size: SH
  12. Remove the rotor screws.

  13. Object Number: 156748  Size: SH

    Important: Observe the alignment of the rotor in relation to the reluctor wheel. The rotor must be reinstalled in the exact position the rotor was in prior to removal.

  14. Remove the rotor.

  15. Object Number: 4341  Size: SH
  16. Remove the CMP screws.

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

  19. Object Number: 423196  Size: SH
  20. Remove the CMP 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 cap and CMP sensor screws can be acquired using P/N 10475922 (pkg of 10 screws). Precoated replacement rotor screws can be acquired using P/N 10475924 (pkg of 10 screws).


    Object Number: 156754  Size: SH
  1. Align the slot in the reluctor wheel with the 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 new CMP mounting screws.
  6. Tighten
    Tighten the bolts to 2.2 N·m (19 lb in)


    Object Number: 156748  Size: SH
  7. Install the rotor onto the reluctor wheel.

  8. Object Number: 4354  Size: SH
  9. Install new rotor screws.
  10. Tighten
    Tighten the bolts to 1.9 N·m (18 lb in)


    Object Number: 4372  Size: SH
  11. Install the distributor cap.

  12. Object Number: 157984  Size: SH
  13. Install new distributor cap screws.
  14. Tighten
    Tighten the bolts to 2.4 N·m (21 lb in)


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

  16. Object Number: 302854  Size: SH
  17. Connect the spark plug wires and ignition coil wire.
  18. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  19. Connect the negative battery cable.