Good, I have a problem in a Renault Great Scen, I hope you can help me find out the problem because not even in the house they know how to tell me what it is, I describe the malfunction. It is a Turbo Diesel 120 hp engine to pass from 2,000 - 2,300 revolutions in a squeeze, that is, when the accelerator stepped together the car begins to tremble quite abruptly and to expel so much smoke than to the back or see him for the mirrors, I have changed my transmission but I doubt that this is the problem since it continues to persist, therefore I think it is the turbo ... You could help me.