Hello everyone,

I have a BMW 540i E39 with an Engine Swap.
The original Engine was a M62B44
with a Bosch Motronic ME5.2 ECU

The engine now is a M60B40 from the older 540i E34.
which has originally a Bosch Motronic ME3.3 ECU

But we have not changed the ECU's, we only changed the Engine itself.

So now the car has a M60B40 Engine from E34 with a Bosch Motronic ME5.2 ECU from E39.

It starts very difficult... and if we give it throttle, it stalls... Only if we squeeze the Fuel line it runs (less fuel) but rough.

Will a ME3.3 original file work for the ME5.2 ECU? Can somebody do it?

Or can somebody calibrate the ECU, so the car can start and run normally as it should do?

Thanks and best regards.