Originally Posted by TripleBlack
Left my car running whilst I ran into the shops for a second on a quiet road. (Left my girlfriend in charge)
As I returned the noise coming from underneath the bonnet was significantly noticable, I havent heard any other motor that sounds like it on idle..... Well I have... a beat up banger!
The front was 'chugger chugging' away whilst the back had a nice exhaust rumble. Really looking forward to this upcoming service, hopefully something will be found that will be cheap and easy to fix
Rough idle on the 335i is often a symptom of HPF issues from what i've gathered on the main part of the forum. On the NA petrol engines it's the injectors and coil packs that make it idle rough, not sure if the 335i has those issues.