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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 code....is there a way around this. Long time sence I played with a Chevy. Anty and all help is apperciated!

  2. #2

    Default

    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?
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3

    Default

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

  4. #4

    Default

    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

    Default

    Ok, I can get a scanner tommrow.

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