My knock sensor is giving a range from 0-25Hz, mostly at an idle a little after my last dyno. Every once in a while i feel strange a vibration when its in gear. Also i've noticed when going through the RPM range i feel power loss intermitten almost like a very subtle bogging most noticeable when the turbo starts to spool. I created a thread like this in the 7mgte but not much response. I thought maybe to check the sparks, i pulled 3 and they all looked pretty good. The engine has 1800 miles on it, the first 1500 of which it was running very rich, especially in the higher RPM range, out of range even for a wideband O2!! The tuner recomended i change the sparks b/c of the running rich before the knock ever came into play, could he be right? Also i noticed it most after i filled up my tank...i use premium..could it be the gas? I just added octane booster to try to help but i have a 300 mile trip tomorrow and need to know its safe to have this knock sensor reading occasionally.
One other thing, it mostly happens at idle and once you press the pedal it goes to zero, most of the time, sometimes it will go up to 7Hz throught teh RPM range.
One other thing, it mostly happens at idle and once you press the pedal it goes to zero, most of the time, sometimes it will go up to 7Hz throught teh RPM range.