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Knock Sensor

Discussion in 'General Chevy & GM Tech Questions' started by groceryman, Jun 15, 2011.

  1. groceryman

    groceryman New Member 100 Posts

    Just had the check engine light come on and it is a po 332 the knock sensor anyone ever replace one if so how hard is it
    thanks.
  2. silveradotrailblazer

    silveradotrailblazer New Member 1000 Posts 100 Posts

    I would turn off the check engine light and see if it comes on again before I changed the sensor. Sometimes a "event" happens to trigger the code and my never happen again. If it trips the code again soon than I'd look into it. I'd try to find out if something is tripping the sensor or if the sensor itself is bad. I've heard that water gets under the intake manifold and gets around the sensor. I've seen some people make a silicone "wall" around the new sensor to keep water from getting down to the sensor.
  3. groceryman

    groceryman New Member 100 Posts

    Had the light cut off it came right back on second time i started it up
  4. silveradotrailblazer

    silveradotrailblazer New Member 1000 Posts 100 Posts

    I've never had to change one but most people I know who did said they had moisture down and around the sensor. They said it wasn't a bad job as the intake manifold is a dry manifold so you don't have to drain any coolant. You'll need a fuel line disconnect tool and basic hand tools. They said the sensor has a plug thats a pain in the butt to unplug, they use two small pocket screwdrivers. As mentioned they took some heat resitant silicone and made a "wall" of silcone around the new sensors so water can't run under the manifold and into where the sensor is located.
  5. groceryman

    groceryman New Member 100 Posts

    Ok thanks for the help dont know how moisture would have got there truck has 115000 miles on it guess one just gave out going to get both replaced think im gunna get a mechanic friend to help do it think i should replace the wire harness to.
  6. silveradotrailblazer

    silveradotrailblazer New Member 1000 Posts 100 Posts

    I've read on this site where guys cleaned there engines with a engine cleaner and water. Then there knock sensors threw codes and had to replace them.

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