Originally Posted by Mikeyb1019
I have noticed recently my 330ci seems to be idling a little rough, only while I am in gear at a light. Once I start to increase the throttle immediately she runs just fine....any ideas. Could it be a fuel issue, I use 93 octane, but for awhile I used 87 (about 1 month).
BMW recommend at least 91 octane as a bare minimum. Having said that, it could be the vanos unit on the blink or the cam sensor. I had the same problem on my 323 (99) but it was something I came to live with. No-one (even BMW) could actually diagnose it. The car went on to do 212000 miles!! :-)