I'm not sure what open or closed loop mean. I did read somewhere in another post, maybe on this forum or another, that the CIS-E is an electronically controlled injection system, however if the electronic component is taken out or in this case unplugged, then it would just be CIS, or a mechanical fuel injection. JD, I know your knowledge is extensive when it comes to the elctronics of these cars as you have helped me in the past and I am aware that you often dissect bad electronic components to see what makes them tick and if there are parts that can be fixed or resoldered to make them work again. Someone posted something with the analogy of the EHA being like a tennis raquet or something, but I was not following what they were saying. The EHA valve - in the inside of it, is there a part that can become loose or stuck in a certain position to cut off the fuel supply to the injectors and cause the car to stall? Seeing that the car would only stall when decelerating or coming to a stop, but never while accelerating or already stopped. My reasoning was that if there is a part that moves via electric current to control fuel output was in a position where fuel was not being cut off, then unpluggin the EHA would cut the power supply to that part and it would be stuck in that postion where fuel was being supplied, but if I were to unplug it after it has stalled then the part would remain in the position that does not allow fuel to go to the injectors at the proper force and the car would never start. But I am sure that when I stalled a few days ago and sprayed carb cleaner on the plate it would run as long as I kept spraying bursts of cleaner, but once I stopped, so did the engine. Tapping on the EHA may have been a coincidence that the engine fired right up without spraying carb cleaner on the plate.

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1990 190E 3.0L