Well this noise was always here with my 2008 335xi but I dont think it was ever this loud. My car seems ok no codes at all but recently my AVG_IGN went from 0 to 3.5 out of the blue in my logs and the car keeps jumping to map 4. Car starts rough but I am also running E30-35 in it. Other than this no other symptoms are present besides the noise. I am wondering if this can cause (sorry for the noob question) but False Knock?? I get NO CODES nothing at all with this no misfire no lean or rich codes etc. Would a aftermarket warranty cover an injector that is noisy? I can almost bet its leaking too but would hate to rack up a diagnosis bill and not have it covered... I set the phone down alittle after half way thru the video and rev the car a bit and the noise disappears at Decel (when injectors shut off). This is at full operating temp. Sounds like it is from the front cylinders almost 100% on that.