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Title: Fuel Pump Priming AEB M5.92 ECU Post by: Placebo on April 09, 2017, 07:57:09 AM 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. Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: Placebo on April 10, 2017, 05:42:34 AM Hmm ignore all of that and let's start with: Do A4 B5s prime the fuel pump?
Sent from my iPhone using Tapatalk Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: _nameless on April 10, 2017, 06:19:58 AM yeah they do
Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: nyet on April 10, 2017, 10:19:26 AM I'm fairly certain the priming isn't controlled by the ECU on b5s
I could be wrong though. Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: Placebo on April 10, 2017, 12:19:43 PM 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. Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: Zenerdiode on April 10, 2017, 04:45:42 PM You're chasing unicorns here. I had a B5 Audi A4 with the AEB 150PS engine - and it never primed the fuel pump. It generally started within about three full starter speed compressions though.
Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: Placebo on April 10, 2017, 07:22:16 PM You're chasing unicorns here. I had a B5 Audi A4 with the AEB 150PS engine - and it never primed the fuel pump. It generally started within about three full starter speed compressions though. 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. Sent from my iPhone using Tapatalk Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: eliotroyano on April 10, 2017, 07:49:52 PM You're chasing unicorns here. I had a B5 Audi A4 with the AEB 150PS engine - and it never primed the fuel pump. It generally started within about three full starter speed compressions though. At least my Euro 1.8T AGU with M383 ECU has fuel pump priming function Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: Placebo on April 11, 2017, 05:44:41 AM At least my Euro 1.8T AGU with M383 ECU has fuel pump priming function 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. Sent from my iPhone using Tapatalk Title: Re: Fuel Pump Priming AEB M5.92 ECU Post by: eliotroyano on April 11, 2017, 08:15:44 AM 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. Sent from my iPhone using Tapatalk Yes no problem. Here is 06A90618CG version. |