I was wondering what other peoples knock readings were. WHile at idle, my knock reading goes anywhere from 2 to 16. When I give any throttle at all, the knock reading goes to 0 and stays there. Is the knocking at idle due to the car running too rich? What is a safe knock limit and how can I fix the knocking happening at idle?
Thanks

 

I think at idle your picking up valvetrain noise and other noises.. Low idle you can hear rattles and other noises that you normally wouldn't associate with engine knock.

Even at low RPM its possible to pick up noise.. The truth is that knock sensitivity needs to be fairly numb at low RPM especially at idle, and progressively more sensitive at mid-upper RPM's where you'd typically produce the peaks of boost and up from there..

Unfortunately I don't know if you can configure the S-AFC2 in that way.. so your better off erring on the side of safety and leaving it pretty sensitive.

 

I see that all the time.. mine reads that way when the weather is hot... but no as Malibujack said.