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Knock Signal Not Working, Do I Have the Correct Sensor?

Josh Burt

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Engine is a 1998 M3 S52, comes stock with some sort of Bosch injector plug knock sensors. I have tried all of the different frequencies, as soon as I get into boost the knock value maxes or comes close to maxing out on all cylinders with a gain of 1. I put in a gain of .5 and when I get into boost the knock signal goes to about 500. I threw an extra 4deg at cyl 1 and the signal looks exactly the same. I am wondering if I have the wrong sensor or what.

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I pulled the intake and took a closer look, I was mistaken. It turns out my car has Siemens knock sensors. I have tuned vehicles with Motec using a Bosch 0 261 231 148 sensor which has a wide spectrum of frequency range. I would think this would work on a Link, but who knows.

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