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2003 Ford F-250 Super Duty Question: knock sersor

 

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Visitor, 5.4L V8, Warminster, PA, March 02, 2011, 19:49

how do you check if a knonk sersor is bad do you need to take off the maniflod to do it dom1967@comcast.net thank tou

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  • Answer #1

    Brian Glastetter March 02, 2011, 20:46
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     Master

    The only method that I know how to diagnose a knock sensor is to monitor the sensors output with a capible scan tool while operating the vehicle. I habe seen failures of the knock sensors from a rodent that has crawled under the intake and chewed into the wiring.

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  • Answer #2

    Ambler Tire Co., Inc. (94 Answers) , Ambler, PA - (215) 646-9150
    ambler March 03, 2011, 11:44
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     Journeyman

    Standard knock sensors can be tested by tapping near the sensor and checking timing on a scan tool,Or you may hear an rpm change.Pezoelectric knock sensors cannot be tested the way.

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