GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC Suburban - 4WD 🢒 Engine 🢒 Engine Controls - 7.4L 🢒 Camshaft Position Sensor Replacement

Removal Procedure

    Object Number: 68506 Size: SH

    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. Remove the ignition coil. Refer to Ignition Coil and Ignition Coil Module Replacement in Engine Electrical.

    3. Object Number: 320256 Size: SH
  3. Remove the spark plug wires from one side of the distributor cap and set them aside.

    4. Object Number: 320255 Size: SH
  4. Disconnect the camshaft sensor electrical connector.

    5. Object Number: 320250 Size: SH
  5. Remove the distributor cap screws.

    6. Object Number: 320253 Size: SH
  6. Remove the distributor cap.

    7. Object Number: 4354 Size: SH
  7. Remove the two screws from the rotor.

    8. Object Number: 156748 Size: SH
  8. Remove the rotor.

    9. Object Number: 156754 Size: SH
  9. Line up the square-cut hole in the rotor vane with the CMP sensor.

    10. Object Number: 4341 Size: SH
  10. Remove the two screws that hold the Camshaft Position (CMP) Sensor.
  11. Remove the Camshaft Position (CMP) Sensor from the distributor.

Installation Procedure

    Object Number: 156755 Size: SH

    Important: Do not use the old cap screws, CMP sensor screws, or the distributor rotor screws. Use replacement screws that have been coated with a thread locking compound. Precoated replacement cap and CMP sensor screws can be aquired using P/N 10475922 (pkg of 10 screws). Precoated replacement rotor screws can be aquired using P/N 10475924 (pkg of 10 screws).

  1. Install the Camshaft Position (CMP) Sensor in the distributor.

    2. 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.

  2. Install the two new screws that hold the Camshaft Position (CMP) Sensor in place.

    3. Tighten
    Tighten the screws to 2.2 N·m( 19 lb in)


    Object Number: 156748 Size: SH
  3. Install the rotor.

    4. Object Number: 4354 Size: SH
  4. Install the two new screws in the rotor.

    5. Tighten
    Tighten the screws to 1.9 N·m( 18 lb in)


    Object Number: 320253 Size: SH
  5. Install the distributor cap.
  6. Install the new distributor cap screws.

    7. Tighten
    Tighten the screws to 2.4 N·m( 22 lb.in.)


    Object Number: 320255 Size: SH
  7. Install the CMP sensor electrical connector.

    8. Object Number: 320256 Size: SH
  8. Install the spark plug wires on the distributor cap .

    9. Object Number: 68506 Size: SH
  9. Install the ignition coil. Refer to Ignition Coil and Ignition Coil Module Replacement in Engine Electrical.
  10. Connect negative battery cable.