2010 E70 x5d misfire

[Shinka1195]

Hey all,

After doing a lot of reading on here, I am seeing many variations of problems with the X5d. What I am not seeing is a description similar to mine to help me diagnose my problem.

The vehicle will start fine. On a random occurrence it will stutter/shudder. Just a minor misfire. It will become more frequent then I get the "engine malfunction" error message and it cuts power and starts chugging like it is running on 3 or 4 cylinders.

I took it in two weeks ago for this issue and the dealership replaced an injector (#4 I think) and the high pressure rail. I got the car back on May 29th and yesterday, June 6th, the same type of problem is occurring. They told me the first time the injector replacement is $1500 and the car just came off of warranty right after the last "repair."

Since the problem is not resolved, I am taking it back to see if they will cover this under warranty if it is the same problem that was not resolved at the last visit. BUT, I would still like to know what the hell is causing this random misfire and why. Any feedback is greatly appreciated.

[Shinka1195]

Also note, if I cycle the engine off then on again, the error message disappears and it may or may not run fine again for another short drive. The misfire does not seem consistent.

[ingenieur]

As posted on other forums - what BMW faults are stored?

[mefferso]

Rough idle sounds like carbon buildup. Do some searching on the diesel sub-forum. Ignorant dealers change injectors when cleaning of the heads and intake is whats needed. CBU is quite common on the 335d's