Originally Posted by ScottB4857
This post couldn't come at a better time. Took my 07 335i in three days ago for a weird misfire issue. Today dealer calls to say code was misfire on cylinder 5. replaced coil, plugs, etc with no help. Mentioned the carbon build up problem and now talking about replacing cylinder head. I will tell them to call the guys up in Newport News for some tips on how to solve.
Big question is - Does the new valve cover solve the problem? I don't need to go through this crap every 20-25k miles. Car currently has around 23.5k miles.
Going through same issue now with Cylinder 4. Car has been in shop for 3 days and counting...