GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

J 35748 Oil Pressure Sending Unit Socket

    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. 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 from the distributor.

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

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

  10. Object Number: 334555  Size: SH

    Important: A DTC P1345 will set if the rotor is not reinstalled in the exact position the rotor was in prior to removal.

  11. Observe the alignment of the rotor in relation to the distributor base (1).

  12. Object Number: 310293  Size: SH
  13. Remove the distributor mounting bolt.

  14. Object Number: 310298  Size: SH
  15. Remove the distributor assembly.
  16. Discard the distributor gasket.

  17. Object Number: 288465  Size: SH
  18. Disconnect the engine oil pressure sensor harness connector.

  19. Object Number: 311702  Size: SH
  20. Remove the engine oil pressure sender with a J 35748 Oil Pressure Sending Unit Socket.

  21. Object Number: 288464  Size: SH
  22. Remove the knock sensor harness connector.

  23. Object Number: 311958  Size: SH
  24. Remove the knock sensor.

Installation Procedure

Tools Required

J 35748 Oil Pressure Sending Unit Socket

Important: Do not use the old screws for the distributor cap, CMP sensor, and rotor . Use replacement screws that have been coated with a thread locking compound.


    Object Number: 311958  Size: SH

    Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

  1. Install the knock sensor.
  2. Tighten
    Tighten the sensor to 20 N·m (15 lb ft)


    Object Number: 288464  Size: SH
  3. Connect the knock sensor harness connector.

  4. Object Number: 311702  Size: SH
  5. Install the engine oil pressure sender with a J 35748 Oil Pressure Sending Unit Socket.
  6. Tighten
    Tighten the sender to 30 N·m (22 lb ft)


    Object Number: 288465  Size: SH
  7. Connect the engine oil pressure sensor harness connector.

  8. Object Number: 334555  Size: SH

    Important: The proper CKP/CMP correlation will be lost if the rotor is not reinstalled in the same exact position. A DTC P1345 will result from improper distributor shaft alignment.

  9. Align the rotor in its original position in relation to the distributor base (1).

  10. Object Number: 310298  Size: SH
  11. Install the distributor assembly using a new distributor gasket.

  12. Object Number: 310293  Size: SH
  13. Install the distributor mounting bolt.
  14. Tighten
    Tighten the bolt to 25 N·m (18 lb ft)


    Object Number: 157986  Size: SH
  15. Install the distributor cap.

  16. Object Number: 157984  Size: SH
  17. Install new distributor cap screws.
  18. Tighten
    Tighten the screws to 2.4 N·m (21 lb in)


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

  20. Object Number: 302854  Size: SH
  21. Connect the spark plug wires and the ignition coil wire.
  22. Connect the negative battery cable.