My 2.0tdi sport 140bhp model as started to black smoke when accelerated from low speeds only during warm up,it as a flat spot or jerkiness to the throttle at the same time particularly bad in slow traffic,the power is there once the throttle is off very low rev's and spot on at top end. Once up to temp the car runs fine and doesn't smoke at all, anyone any advice?, it showed a maf/maf wiring fault code but after fitting a non gen new replacement the symptoms were worse, i was wondering if it could be a dodgy temp sensor fooling the ecu that it is flat cold and using cold start function as it happens between approx 40 to 80 on the temp gauge then goes away once running at 90.
the car also suffers the hot start cranking over fault.
any ideas would be helpful.