My fuel pump never primes; not on door open nor on ignition start so I have to crank the car a few times when cold before it fires up.  I dont know why this is but pretty sure it is not hardware; I can prime it using VCDS. Fuel pump works fine otherwise.

Thinking I need to change something in the ECU to get it to prime like it should. I say this because Ive seen multiple complaints from people who have flashed using EURODYNE MAESTRO with their AEB ECUs also losing the fuel pump prime after flashing.

You can flash this ECU to your hearts content but you cant read this ecu unless you desolder the chip.   Hence all of my of own tuning has been from a stock file someone posted in the original files section.  Bin is attached

Somehow losing the prime ability after flashing does not make any sense to me so totally stumped.  Maybe I am somehow mismatched  with the original bin and the bin I flashed and tuned? 

Please let me know if you know of any factor or maps I should looking into to get priming working again.  Only thing I know to play with is TLST which controls injector opening time on cranking start but this seems like a hack and not the proper fix.


Thanks for whatever info you can share.

yeah they do

Thanks for the info on this.  I found AEKP in ME7 FR and studying it on pg 1387.  Not that it applies for the older motronic m5.9 or M3.8X aeb ECUS but hoping it will get me looking into the right direction as it  does describe the prime logic for ME7.

If the ECU does not control the prime for the older motronic, wonder what could.

Thank for steering me in the right direction.  My long cranking time may be due to e85 and larger injector scaling.  I can play with these settings.


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You have a stock bin for this you can share?  Curios enough to investigate cross flashing as I'm under the impression m5.92 and m3.8x are very similar. 


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