I returned to the workshop to charge the battery  of the station wagon because it had startup problems. The battery was full, the (refurbished) generator works perfectly and the startup & idling problems remain. Fuck. After cleaning and a quick checkup (see other post) I decided to drive home. Then it came to me: The battery was dead a couple of days ago and the Merc has PMS. Not premenstrual syndrome but some kind of pressure motor control. And this computer has no hard drive so it looses it’s memory every time the battery is disconnected. After that you have to teach in the accelerator pedal. Turn on ignition, slowly push down the pedal for two (?) times and then start the engine. Problem solved. I should remember this stuff…