Hello guys, had the problem that the engine ran at times very rough, and that in the 4th gear in the cold engine condition a strong jerking was to be noticed during acceleration! I drove to the workshop, this found a hardware defect and replaced an EKB or ECG part, and played me up a software update, now the jerking as well as the unround motor run away is almost eliminated, but now I hear an unbearable and very loud nailing of the engine true, whether in the cold or warm engine condition, especially if I drive off or constantly drive a speed! Now my question, can I just drive back to the workshop and let the old software play on it at guarantee costs, speak with which I did not have these engine noises or can you not make downgrade with the ECU? Because in this condition the 20 year old sewing machine of my mother is quieter than just my updated Ford Mondeo, but supposedly the master de The workshop itself was tested and felt the car with these sounds as fine, well the love should go to the ear doctor…