regarding xp190's hesitation
My 86 190E 8 valve hesitates all the time. It has very low acceleration and wont go over 60mph either. My EHA current is 0mA all the time. What was the thing that caused your eha current to stay at zero longer than it should have? Maybe mine has the same problem
Though, I setup to manually control the current through the eha and tweaked it around 8mA + - 4mA while accelerating and running at top end. No matter what current I had, the car ran the same miserable way. Bad eha I suppose?