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Thread: knock sensor

  1. #1

    Default knock sensor

    would a bad knock sensor contribute to bad gas mileage? its a 2000 silverado 1500 ext cab 4x4 with a 5.3 in it, the truck seems to run fine but the mileage dropped 3 mpg

  2. #2
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    Default

    Yes it could if it's retarding the timing too far & too much of the time. Retarded timing kills MPG, also kills the power. Did you notice a power decrease along with the MPG loss? Many other things can lead to lost MPG so don't limit your diagnosis to the knock sensor.
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  3. #3

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    X2 what stephan said. How long since you changed your fuel filter and have you cleaned the MAF?
    :cool:

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  4. #4

    Default

    thanks guys the fuel filter &maf were both change about a month ago!the check engine light is on & the only thing showing up in the chevy dealers diagnostic computer is the knock sensor

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