how do you check if a knonk sersor is bad do you need to take off the maniflod to do it firstname.lastname@example.org thank tou
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2003 Ford F-250 Super Duty Question: knock sersor
Answer #1Brian Glastetter March 02, 2011, 23:46Master
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.
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.