I wrongly asked my ́question in the normal V8 forum, but I will gladly repeat it here, hoping to have more success and get answers.
So, while driving, my box just went out, no notice, no nix. City traffic, all of a sudden quiet and all of the lamps on. Start attempts failed and I was in the middle of the main track, so out and push the box to the right (no gift that's with a automatic). Well, at least there's everything that was feasible considering the engine heat and trying to start again and again. The temperature (water) increased to almost 110°C and after 10 minutes or so, the buck jumped again. So quickly after HAuse, let cool down and then started to look (nightly), but somehow was not so successful (but now the GRA works again and the plug from the timing puncher is also oil-free again)

Today I went on to check the distributions, the power stages, all the sensors and the receivers, the two pump relays with relay plate and the stuff, the HAllgeber. At some point a test drive of 6 km was done, everything went well, then called my VAg Fritzen, in order to come by briefly and read memory. 9 Km, he could not read out the memory, did not come in the program (the old SAck, who is there it always costs 18 teuro that) or he can not. His young colleague usually does this for free (but gets tipping) and with that the max. Two minutes. Well, at least I went back home, but I didn't get 9 km to go, only 8,9 km, as I stayed 100 m outside my door. So nothing like the pump relays, with pitch lamp and self-made adapter cables, aebr nix which were iO. After the reverberator looked (had still all the measuring instruments in the car), but that was also iO. once again to gag, and swoops, at once he ran again.
Does anyone have a hint what could that be???
It would really help me

good drive on all sides