Schocki

But there is power to both brains but it looks like the rpm impuls from the EZF to LH is insufficient or non working correctly.

I'm running out of clues and I think it is time that somebody else works on the car directly and not from 1200 miles away...

Landseer

Yes, you probably need to be at the car with the documentation ( not just wiring diagrams ).


Great puzzle though.

Schocki

Great puzzle, yeah

You don't need Sudoku if you have a 928...

Schocki

OK gents, just to give you the final update and the solution to the problem. I talked to the owner of the car and they brought it over to a 928 specialized shop.
The solution was (as I thought) very simple but I had no chance on finding the reason if you don't have access to the car.
The distributor rotor was not setup correctly and 180 degrees off!? No wonder that the car refused to start on starter fluid, if spark is available and if the timing is correct it HAS TO RUN for a second or two.

Interesting and mysterious fact: The engine ran before it was extracted out of the donor car and the mechanic said he never touched the distributor unit.....
I don't think that this is true and the mistake happened when the distributor was checked for timing and orientation. Maybe the timing was not at TDC for piston 1... and 180 degrees off!?!?

Thank you for all your help, problem solved case closed