Thank you again for a helpful list.
However, my current setup of a -561 ECU (B230F) works fine on a -176 EZK (B200F).
What I negleceted to do yesterday was read error codes from the -949 ECU that doesn't work. So this morning I swapped the ECUs again. Again a no start condition, but also no error codes.
Then I tried the so called "control function 3" that alternately operates the injectors and IAC for a couple of times.
Aha! There were no clicks from the injectors, the IAC did operate.
So that's where the problem is coming from. In other words my flooded engine "diagnosis" could not have been right unless the injectors were kept open all the time (hence the smell of fuel and hence the temporary trouble starting on the functional ECU afterwards).
Sadly I seem to have a dud -949 but I have found someone dismantling a B200F 245 that I am in contact with. Lets see what he's got.
To be continued.
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