Knock sensor - testing necessary? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
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post #1 of 2 (permalink) Old 10-18-2015, 02:26 PM Thread Starter
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Knock sensor - testing necessary?

(1995 Caprice LT1)

Is there any way to test if your knock sensors are working? Scan9495 shows tons of knock at startup, but the count doesn't rise while driving. Normally not a problem, but at WOT under-load, I swear I am hearing it. At 80% throttle - no noise. At 100% throttle - marbles in a can, but nothing showing up on the log. The PCM isn't doing anything under "knock retard degrees" - always shows "0"

No codes. Runs great otherwise.

If I were to have the scanner open and then rap on a sensor with a screwdriver or something, would that be an acceptable test to see if they are working correctly?

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post #2 of 2 (permalink) Old 10-18-2015, 05:48 PM
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You can tap on any safe hard part of the engine with a hammer while scanning and see if you get any counts. I would say it is working, though, since engagement of the starter causes it to increment (which is normal).
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