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Bob
Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4087
Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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It has the 5.7 liter motor. any advice would be very helpful.

Customer Question

It has the 5.7 liter motor. any advice would be very helpful.
Submitted: 6 years ago.
Category: Chevy
Expert:  Bob replied 6 years ago.

Hello, the cam position sensor is located inside the distributor. Installation instructions posted below. Thanks

Document ID# XXXXX
1998 GMC Truck GMC

 

Camshaft Position Sensor Replacement

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.
    Object Number: 320256  Size: SH

  2. Disconnect the spark plug wires and ignition coil wire from the distributor.
    Object Number: 320255  Size: SH

  3. Disconnect the CMP sensor harness connector from the distributor.
    Object Number: 320250  Size: SH

  4. Remove the distributor cap screws.
    Object Number: 320253  Size: SH

  5. Remove the distributor cap.
    Object Number: 301396  Size: SH

  6. Remove the rotor screws.
  7. Remove the rotor.
    Object Number: 156754  Size: SH

  8. Align the square slot in the reluctor wheel with the CMP sensor.
    Object Number: 301398  Size: SH

  9. Remove the CMP sensor fasteners.
  10. Remove the CMP sensor.

Installation Procedure

Important: Do not use the old cap screws, CMP sensor screws, or 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 (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 square slot in the reluctor wheel with the CMP sensor.
  2. Insert the CMP sensor through the reluctor wheel slot.
    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.

  3. Install new CMP sensor mounting screws.

    Tighten

    Tighten the screws to 1.6-2.8 N·m (14-25 lb in)


    Object Number: 301396  Size: SH

    Important: The locating tabs on the rotor are necessary for correct alignment of the rotor. If the tabs are missing or damaged, replace the rotor.

  4. Install the rotor onto the reluctor wheel.
  5. Install new rotor screws.

    Tighten

    Tighten the screws to 1.5-2.4 N·m (13-22 lb in)


    Object Number: 320253  Size: SH

  6. Install the distributor cap.
    Object Number: 320250  Size: SH

  7. Install new distributor cap screws.

    Tighten

    Tighten the screws to 1.8-3.0 N·m (16-26 lb in)


    Object Number: 320255  Size: SH

  8. Connect the CMP sensor harness connector.
    Object Number: 320256  Size: SH

  9. Connect the spark plug wires and ignition coil wire.
  10. Connect the negative battery cable.

Document ID# XXXXX
1998 GMC Truck GMC

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