Knock Sensor: Service and Repair

REMOVAL

Tools Required
J 35748 Oil Pressure Sending Unit Socket

1. CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

Disconnect the negative battery cable.




2. Disconnect the spark plug wires and ignition coil wire from the distributor.




3. Disconnect the CMP electrical connector from the distributor.




4. Remove the distributor cap screws.




5. Remove the distributor cap.






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

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




7. Remove the distributor mounting bolt.




8. Remove the distributor assembly.
9. Discard the distributor gasket.




10. Disconnect the engine oil pressure sensor harness connector.




11. Remove the engine oil pressure sender with a J 35748 Oil Pressure Sending Unit Socket.




12. Remove the knock sensor harness connector.




13. Remove the knock sensor.

INSTALLATION

Tools Required
J 35748 Oil Pressure Sending Unit Socket

IMPORTANT: Do not use the old cap3 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 GM P/N 10475922 (pkg of 10 screws). Precoated replacement rotor screws can be acquired using GM P/N 10475924 (pkg of 10 screws).






1. NOTE: Refer to Fastener Note in Service Precautions.

Install the knock sensor.

Tighten
Tighten the sensor to 20 N.m (15 lb ft)




2. Connect the knock sensor harness connector.




3. Install the engine oil pressure sender with a J 35748 Oil Pressure Sending Unit Socket.

Tighten
Tighten the sender to 30 N.m (22 lb ft)




4. Connect the engine oil pressure sensor harness connector.






5. 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.

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




7. Install the distributor assembly using a new distributor gasket.




8. Install the distributor mounting bolt.

Tighten
Tighten the bolt to 25 N.m (18 lb ft)




9. Install the distributor cap.




10. Install new distributor cap screws.

Tighten
Tighten the screws to 2.4 N.m (21 lb in)




11. Connect the CMP electrical connector.




12. Connect the spark plug wires and the ignition coil wire.
13. Connect the negative battery cable.