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knock sensor

Discussion in 'General Chevy & GM Tech Questions' started by mikemax, Jul 24, 2011.

  1. mikemax

    mikemax New Member

    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. stephan

    stephan Rockstar 4 Years 5000 Posts

    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.
  3. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

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

    mikemax New Member

    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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