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Thread: Knock sensor

  1. #1

    Question Knock sensor

    I just purchased a 1991 K1500 4x.... the previous owner rebuilt the 5.7, and add a mild cam along with an eldelbrock intake. Small problem, the cel is on, and the code is for the Knock sensor. If I am correct, teh bigger than stock cam has set the there a way around this. Long time sence I played with a Chevy. Anty and all help is apperciated!

  2. #2


    The knock sensor code sets when your computer hears a knock and it can't shut it up by retarding your timing. So a cam could indirectly cause a knock sensor code, as could any noise like a tappet, exhaust leak, fan belt, etc. Can you hear any engine pinging? Sometimes you can't hear the knock. Have you tried boosting your octane?

    2004 SILVERADO 2500HD LS
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    1990 Geo Metro Convertible
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  3. #3


    I,m running 93 octane. No noises at all.

  4. #4


    The next step is test the sensor. A scanner showing the signal from the sensor to the computer makes this an easy task. Watching the scanner, tap on the exhaust manifold with a wrench and see if the signal changes. This will test for a bad sensor.

  5. #5


    Ok, I can get a scanner tommrow.

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