Pontiac 10456288 Sensor,Knock

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The knock sensor is liable for sensing irregular engine vibrations and minimizing spark knock. This results in a greater degree of AC output voltage, which is then given to ECM/PCM to retard the timing. Depending on the year and engine application, the location of this sensor can be different but normally it is found at the rear of the engine block or even at the side of cylinder head. For checking resistance of this sensor, remove electric connector and measure resistance between terminal and vital part of engine's body. If it falls outside this range, it should therefore be replaced. While running engine again, connect back connector and use voltmeter to verify an AC voltage signal here. Voltage ought to rise with increase in speed of an engine. If there is no any voltage signal available then knock sensor must be replaced because it has failed completely. When replacing this knock sensor just disconnect negative battery terminal before removing distributor or oil pressure sending unit if necessary; disconnect electrical connector and remove knocker from your engine block; installation is opposite to removal process. On 1988 -1995 models, ESC module located near throttle body however starting 1996 up to 2000 model years incorporated Knock Sensor Module with PCM as stated above; therefore remove PCM along with Knock Sensor Module cover also take out Knock Sensor by pinching retaining tabs & pulling up vertically straight; align tabs on notches press down until retaining clips snap into place for installing Knock Sensor Module while finally install PCM cover as well as Knock Sensor Module cover too.

For models from 1996 to 2000, the knock sensor module is located in the PCM. To replace it, remove the PCM and the knock sensor module cover. Pinch the retaining tabs and pull the knock sensor straight up to remove it. To install the knock sensor module, align the tabs with the notches on the socket and press down until the retaining tabs click into place. Finally, install the knock sensor module cover and the PCM.

The knock sensor is located on the rear part of the engine block, to the left of the distributor.

First, loosen the left or right front wheel lug nuts on V8 models and raise the front of the vehicle on jackstands.

Disconnect the electrical connector from the knock sensor and remove the retaining bolt to take out the knock sensor.