Z4-forum.com

Hi,
I have had a prob over the last few months where the idle has been rough. Symptoms are: intermittent rough idle / engine shakes sometime when idle / seems to drive ok when it is going.

I rebuilt the double vanos about 3 years ago. I recently replaced both exhaust and intake solenoids and put new pistons / oil change a week ago. I changed the crankshaft sensor (exhaust).

My diagnostic machine reads ‘stiff exhaust mechanism’.

Any thoughts what might be the problem or what to look at next.
Thanks

Update. Took the car to a BMW specialist. Worst fear diagnosed, vanos unit. This time I wasn’t up to sorting it myself. Anyway, got the car back today after the vanos unit was replaced. Problem sorted and idle is perfect.