Hey, so I'm new to the forum.
I just want to give a big thanks to Bert and Jacks for helping solved the problem with my car.
So I had a strange miss fire happening at low RPM, I thought they were commonly at higher RPM. The miss fire wasn't bad at first but quickly got bad enough to shut down cylinder 5. I took car of the Spark plugs and Coils, with no success.
Car details;
~54,xxx KM
2008
335xi
No modifications by the previous owner from what I can see. I would say it was well taken carer of, and given a good hard drive every now and then without being constantly abused.
I've only disconnected the exhaust valve, Nothing else.
So, given the relatively low millage it seemed unlikely that Carbon was going to be an issue but it was taken as the next step in solving the miss fire.
I have some before and after pictures to post in a minute, which had a little more carbon than I expected.