Knock Sensor: Service and Repair

REMOVAL PROCEDURE

The knock sensor is located in areas of the cylinder head. On most applications, the knock sensors are installed in a hole which is exposed to engine coolant. Care should be exercised when servicing these sensors.

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.

IMPORTANT: On knock sensors which are mounted in the end of the cylinder head, draining the cooling system will not be necessary.

2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
3. Remove the wiring harness connector from the knock sensor.
4. Remove the knock sensor from the cylinder head.

INSTALLATION PROCEDURE

NOTE: 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.

NOTE: Refer to Fastener Notice in Service Precautions.

IMPORTANT: Do not use silicon tape as this will insulate the sensor from the engine block.

1. After applying a water base caulk to the sensor threads, install the knock sensor into the cylinder head.

Tighten
Tighten to 19 N.m (14 lb ft).

2. Connect the negative battery cable.
3. Refill the cooling system if required.