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Ok, don't use a check valve on the line to the J&S. Don't run it without a vacuum line. I'm not sure why, but it is not behaving as John described. He is saying that the knock detection will remain intact. Today on the way home from work I experienced some low rpm detonation, and the unit was not doing ANYTHING about it. I pulled over, removed the check valve from the line to the J&S, and when I recreated the conditions under which I got detonation, the knock LEDs became a ****ing light show.
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