Hello, remove the starter motor swirl and simple, without acting on the control unit. Just a resistor 4k7 between the +12v connector of the motor and the pwm signal. This allows the control unit to the motor.
About this I do a question... I made this edit, deleted the egr, but the c220 cdi with the change of the drive has doubled its consumption. There is a certain uncertainty in the low revs, and honestly, I did not understand if it is due to this change, or if it's a matter of adapting the parameters with the amount of air that enters. I have to say that the pipes are clean and that the swirl has been deleted. What do you think ? as risolvereste you the problem ?