I have never been able to figure this out and neither has my MB dealership. My 92 400E runs fine. But when the temperature outside reaches 65 degrees the car gives problems. If I try to start the car it won't. It sounds like a dead battery or a flooded engine. After ten mintues of just sitting in the car it will start. This only happens when I try to start it. It can be 100 degrees outside but if it is already moving nothing happens. This only happens when I start it up or when it is in idle. Any help would be appreciated.