GHott
It's definitely *not* our knock sensor or anything of the like - the "noise" is electrical, not physical.
In most cases, isolating the ground loop, using another circuit for your taps, or cleaning up the particular taps you already are using will, with our Scoobys, permanently cure the issue.
Our Scoobys are electrically rather noisy, unfortunately. ops: A fellow LGT owner, also using the TXS Knock-Light, actually got enough ground-loop feedback to cause his ECU to see enough -KC that it pulled down his IAM to, get this, ZERO! And on my wife's WRX, when the weather's just right, if we engage the windshield wipers, we get noticeable feedback noise on her XM. This noise is purely electrical, and as such, in the vast majority of cases, such electrical fixes will eliminate it.
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