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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
False knock between shifts?
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<blockquote data-quote="Kman11" data-source="post: 15949159" data-attributes="member: 179746"><p>If someone can help answer these questions about knock sensors it would be very helpful -</p><p></p><p>Exhaust -</p><p>- Loose exhaust is talked about all the time as being a culprit. If i rev my motor in neutral and hold the rev, and bang on my exhaust with a hammer why don't i get a knock count? ( When i rev my motor quickly, i do get a KR reading for reference so they are active with no load). Since the hammer won't do it, does that mean the frequency isn't "perfect", but a loose clamp can somehow be the "perfect" frequency?</p><p></p><p>Do knock sensors work when the engine is cold just the same as when it's warmed up?</p><p></p><p>What would happen if i unplug them? Does the computer go into limp mode?</p><p></p><p>The knock sensor is designed to pick up the sound of detonation. Yet the tuners will tell us (who have false knock) it could be anything rubbing or tapping. It's amazing to me that a sensor so crucial to the operation of an engine can be fooled by ANYTHING tapping or rubbing in the entire car. If we take that statement and assume it's true (anything tapping or rubbing) then how the hell are all the inner working of the transmission, rearend, driveshaft etc able to do their thing without the knock sensors going crazy all the time (lots of rubbing / tapping going on in there!)</p></blockquote><p></p>
[QUOTE="Kman11, post: 15949159, member: 179746"] If someone can help answer these questions about knock sensors it would be very helpful - Exhaust - - Loose exhaust is talked about all the time as being a culprit. If i rev my motor in neutral and hold the rev, and bang on my exhaust with a hammer why don't i get a knock count? ( When i rev my motor quickly, i do get a KR reading for reference so they are active with no load). Since the hammer won't do it, does that mean the frequency isn't "perfect", but a loose clamp can somehow be the "perfect" frequency? Do knock sensors work when the engine is cold just the same as when it's warmed up? What would happen if i unplug them? Does the computer go into limp mode? The knock sensor is designed to pick up the sound of detonation. Yet the tuners will tell us (who have false knock) it could be anything rubbing or tapping. It's amazing to me that a sensor so crucial to the operation of an engine can be fooled by ANYTHING tapping or rubbing in the entire car. If we take that statement and assume it's true (anything tapping or rubbing) then how the hell are all the inner working of the transmission, rearend, driveshaft etc able to do their thing without the knock sensors going crazy all the time (lots of rubbing / tapping going on in there!) [/QUOTE]
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Engine/Tuning
False knock between shifts?
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