I'm having a issue with my 520i that I just bought in may. When I'm "hard" on the throttle it gives me a "grr" and BMW can't come up with the error... Let's cut it short, they have tried 4 times and spend like 3-4 hours without result. The computer tells them nothing. The only lead (electronically) is that cylinder 2 and 4 is slightly off (off ??) compared to 1 and 3 - but there all within the accepted limits...
I've made a post on my own web and a youtube aswell > BMW 520i, N43, 2008 model | topdollar.dk and the youtube clip (14 sec.) but please visit my web first to see technical stuff.
My best quess in knocking since the computer can't keep up?