Well it seems I'm too dumb to get the simplest things running :)...
Problem: There are some 3rd party ACFT that still require you to load a default ACFT with ENG running.
Whenever I load the default AC11 (blue), it loads with ENG off. I already started it's ENG several times and did save the scenario and also marked it to be the default scenario for P3D but it never loads it with running ENG.
What's odd is that I did receive a while ago a saved file from somebody else and if I loaded that scenario, the AC11 always had it's ENG running. Comparing both files did not reveal anything..they were identical...
The F22 though will always load with running ENG...🤕