Hi fellas I have a problem with my AU SERIES 3 I6 INTECH blowing black smoke and chewing though fuel like crazy. I have changed the coil packs,spark plugs,knock sensor,fuel pressure regulator,fuel filter,fuel pump,spark plug leads,map sensor,O2 sensor cleaned the throttle body pcv and the whole lot only use bp ultimate (waste of money). Does anyone please have any clues what it could be ??? cheers