was wondering this myself as i have a similar problem with mine,mine is giving all the signals of overfuelling like black smoke and the smell on dropping gear ,plus after being out in it, while it is stationery it is leaving a black sute on the ground coming from the exhaust "i hear yous all saying overfuelling" but the spark plug tips are white so it aint getting enough fuel its a head scratcher.think its the turbo so i've got one coming and its going on the exhaust gas analyzer in college to find out exactly just hoping someone here may have a few suggestions. sorry for jacking your thread