Yes another R56 problem thread, sorry but looking for guidance from people who have suffered the same issues as I am having with my cheese engined MCS ........
Car is 08 build, has 31k miles, regularly serviced and oil changes, catch cans fitted 3k miles ago
Recently (last 2k miles) I have been experiencing a distinct drop in fuel economy (about 5-6mpg) and my routes/use hasn't changed. I have experienced intermittent hesitation when flooring it from constant revs, ie at motorway speeds. This hasn't been too intrusive but is noticeable.
Yesterday and this morning when starting the car it had a serious misfire and actually stalled a couple of times. The exhaust was popping and banging like a bastard (in a bad way not the usual nice way) when trying to keep the revs up so as not to stall again. When the engine warmed up a bit, still stationary at this time, it simply went away and I carried on my journeys.
I have been parking my car up against my garage door for security in the last week, but as I left this morning after the problem died off, I noticed the garage door was covered in oily sooty crap.
There are no codes, the knock detector isn't showing any issues and temps and boost are all fine.
Bizarrely, when I turned on the ignition today the dash clock had reset itself to _ _ : _ _ and the trips and OBC settings had all turned to zero.
The auto start/stop hasn't been working recently, although did last night.
So - I am considering the following:-
HPFP, I don't think it has been replaced yet
Due to the OBC resetting, could it possibly be a battery issue?
Possibly a vacuum leak, would this manifest when cold only?
Thoughts and advice would be appreciated