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Re: Knock sensor? 700 1985

posted by  someone claiming to be John Sargent on  Sun Jul 15 14:03 CST 2001 [RELATED]

Some advocate a resistance check, but I am told that is not reliable. The knock sensors are not serviceable, but can be purchased for $40 US or less. Do you have engine knock? The knock sensor is a piezo-electric transducer. Engine knock produces a signal at about 7.5 kHz, which the knock sensor is tuned for. When knock occurs, the ECU retards the timing by 2.8 degree increments until knocking ceases to a maximum to 10 to 15 degrees (maximum retard is determined by the ECU. When knock ceases, the timing is advanced in 0.35 degree increments until knock occurs.





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