Originally Posted by E92 325
Why did you think it was the coils? Was it an intermittent misfire under load by any chance?
yeah thats exactly what it felt like ! there were no fault codes and everything pointed towards a coil or injector ,so i changed them ,and the fault persisted eventually a code came up and told me it was the valve timing ,I replaced the vanos soleniods and its been perfect ever since ,you can feel the timing change now where as before it just ran rough ,it was a while ago and I did a thread about it because the vanos soleniods do tend to get mucked up and stick ,mine were just stuck ,you can fix this by cleaning them but i replaced at 50quid each , I took it for a run and couldnt believe the difference