Hello, I have a Fiat Siena TD year 2006, I just bought it used in an agency, I started doing the next fault, when it reached 2000 - 2200 rpm the engine begins to make some pulls and if I continue to accelerate it increases its regime slowly until it reaches about 3000 rpm long long smoke and without the vehicle waning in speed, all this does that the temperature indicator of the temperature of the board is. Temperature stripe (after the motor started cold). The fault described does not do it with the cold engine (of being stopped all night) since I barely start it and go out to walk and I arrived at 3000 rpm normally without saying goodbye in excess smoke by the exhaust. I wanted to know if someone can guide me about the cause of the problem and the possible solution, I thank you for your time, and to replace me, have a little patience since sometimes it takes time to answer for not having time to apply some suggestion that they do to me. Thank you.