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Originally Posted by cody
Really? As I have been lead to believe, the factory knock sensor is a weak microphone based one that doesn't work at higher RPM's (above 4K IIRC). Knock is common on 04's stock as I mentioned before. The ECU will pull timing at specific RPM's and this could manifest itself as a flat spot in the powerband. It's really a bandaid to the problem and not a solution though.
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Its certainly not a weak microphone. It may be a mic, but its certainly sensetive enough to detect even the slightest bit of knock. In fact, the knock sensor will detect knock before you could audibly hear it.
IIRC The knock sensor shuts down at just past 6k RPM (like 6250 or 6500 I think) and won't start back up again till around 5500 on the way back down.
It can cause a flat spot if you car is knocking (I doubt it, as its more a problem for 04+). But you certainly won't hurt your engine.