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check for turbo failure, loose turbo hoses or cracked intercooler
at idle the amount of air is correct for the fuel setting but on rpm the fuel increases but the air increase is missing
run fault codes
what kind of smoke by that I mean what colour is it and when does is happen under hard acceleration, at idle, when first started, under light acceleration, idling a long time? blue smoke is burning oil, white smoke is burning coolant sometimes accompanied with a sweet smell, black smoke its running rich. those are the basics.
The emittion of black smoke on start-up is an indication that the fuel mixture is rich, (there's too much fuel going into the engine for the amout of air present in the engine), this could be because the fuel in one of the cylinders is not being ignited (burnt) by the spark plug,or one of the sensors is giving a false reading.
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