I have just successfully replaced the throttle body on my w204 c220 saloon which as extinguished the engine management light on my instrument panel. However, i now have another problem. As a result of replacing the throttle body my vehicle is now emitting large plumes of excess smoke via the exhaust system when cold. As soon as the engine gets up to temp the smoke disappears. I have tried turning the ignition on to position two and leaving it for 20 mins to see if the vehicle electronics would solve this issue but without success. Any comments as to how i can solve this issue would be greatly received.