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What is the purpose of the knock sensor?

Updated: 10/22/2022
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15y ago

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advance or retard timing so vehicle will tolerate lower grade fuel..djones1..chevy dealership

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Q: What is the purpose of the knock sensor?
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Will the knock sensor make the smoke?

No. The knock sensor's purpose is to detect spark knock (pinging) and send a signal to the ECM to temporally retard the timing until the spark knock stops.


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A knock sensor is located in a specific area on the block or cylinder head in order to sense spark knock occuring and send a signal to the ECM to retard the timing. Relocating the knock sensor would defeat its purpose.


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