Knock sensor test using ista.

[andrei.m4]

Hi to all, my m4 have some problems, sometimes it missfire at idle with ac off, when i turn on ac misfire dissapear but sometimes it can misfire with ac on too. I replaced 3 coils and all spark plugs, these 3 coils had some brown deposit in the head so I said need replace. In lower rpm car surge on 5th gear I can feel better the surge/hesitation. I tested knock sensor with ista and at idle or in gear on all cylinders knock values are big than 1.7-1.8(at idle) and on cyl6 is 1.0 with ac off and 1.1-1.2 with ac on. It seems to be low value. In gears with car running cyl6 read low values than all cylinders. I tryed to search google about knock sensors and what low value mean and I can t find something to help me. If anyone can help me with some info.