I've recently come across some low Hz knock sensor readings...anywhere from 0-25Hz. It's highest at idle (which it idles 1K) and once you press the pedal it drastically drops to anywhere from 0-10Hz. Cruising on the highway around 5Hz. Some people have mentioned spark knock (i've never heard of this). I've more recently noticed while on the highway, when i go under boost the car tends to bog especially in 5th and as the boost builds, its not smooth acceleration at all mostly noticeable in the upper gears. I have NGK-R plugs (the step below iridium) and they have just about 3K on them now. The first 1500 miles though the car ran extremely rich and other times extremely lean b/c it was so untuned.
Also i occasionally notice a strange vibration/grinding noise similar to that of a clutch as if you would just barely be getting into gear while driving. It mostly happens on start up and as it just warms up but still occurs less often when hot
Also i occasionally notice a strange vibration/grinding noise similar to that of a clutch as if you would just barely be getting into gear while driving. It mostly happens on start up and as it just warms up but still occurs less often when hot
