Thanks, Dave and Richard
I just made an other test: Connecting a test light to the positive and negative pole of the ignition coil. When doing that and turning the engine, the light must constantly fluctuate. But it does not. Is flashes once and stays dark afterwards. (Analog to the „spark test“, mentioned in my previous post.)
So, i suppose, it‘s the ignition and I hope, that it‘s only the parts inside the distributor and not the ECU.
A question, aside of my starting problem… on my (hotwire) car, are the ignition and injection systems independent, or does the ECU control both?
)