Rough running N52B25 2.5i

[Smartbear]

So did you run the car with the MAF disconected? Quick, free & easy and will discount or incriminate the maf.
Regards

 

[JonBooth]

I haven't but I would need to leave it disconnected for some time due to the intermittent nature of the fault. Considering the only fault it has logged before points towards Vanos, I thought that it was worth a try. I would much prefer it to just break down and stay broken until it was fixed, at least then you could isolate the problem.

If it happens again over the weekend I'll disconnect the maf sensor and see if it starts running properly again.

Thanks again for the reply.

Cheers,

Jon.

 

[JonBooth]

Hello everyone,

Just to let you know that since I changed both Vanos solenoids, the problem has so far disappeared and the car does seem to feel a bit smoother and quicker. I won't know if the issue is sorted for definite for a couple months with it being an intermittent fault but so far so good. I'll let you know if it returns.

Thanks again,

Jon.

 

[Alex B.]

Thank you for your useful post.

My z4 also has this problem and it appears to be getting worse.
Did the solenoid change solved this issue for your car so far?