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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
need help finding false knock?
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<blockquote data-quote="cb900f" data-source="post: 14326017" data-attributes="member: 154445"><p>It's not a leak that is detected as knock but it tapping on the body/rearend/wherever. That sound is resonated up the pipe to the knock sensors. </p><p></p><p>Example:</p><p></p><p>On a hard shift the mid pipe flange hits the frame, that "bang" is resonated up to the motor and is picked up as knock. Knock sensor goes off and retards timing by say 4 degrees. No more knock is detected so timing is slowly added back in. (Stair step look on the datalog)</p><p></p><p>Shift again, bang, retard timing, slowly add back in. </p><p></p><p>Etc....</p></blockquote><p></p>
[QUOTE="cb900f, post: 14326017, member: 154445"] It's not a leak that is detected as knock but it tapping on the body/rearend/wherever. That sound is resonated up the pipe to the knock sensors. Example: On a hard shift the mid pipe flange hits the frame, that "bang" is resonated up to the motor and is picked up as knock. Knock sensor goes off and retards timing by say 4 degrees. No more knock is detected so timing is slowly added back in. (Stair step look on the datalog) Shift again, bang, retard timing, slowly add back in. Etc.... [/QUOTE]
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Engine/Tuning
need help finding false knock?
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