Quote Originally Posted by steveo View Post
10 degrees is about what most old gm calibrations subtract for a knock sensor failure. do you have a knock sensor failure?

failing that it must be an ADX issue or something
Not that I'm aware of. It's a band new sensor, I'm not getting any codes and I get occasional Knock detected. I do have all the EGR stuff turned off for purposes of data logging not sure if that could affect it.