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usually on the side of the engine by the crankshaft. The knock sensor provides the computer the position of the crank shaft to give it the right information to get correct timing. A bad knock sensor will cause it to run ruff or not at all
The knock sensor senses spark knock or pinging and sends that info to the ecm. The ecm then in turn retards the timing until the ping stops. You can test the knock sensor with the engine running, with a timing light attached watch the timing marks as you tap the engine block with a small hammer, you will see the timing retard briefly.
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