Hey does anyone have any or can rebuild, my buddy has a 2003 5.7 and apparently it’s kaput, thanks let me know.
the numbers on back are 12584052 and 864052ka61350064 MEFI-4

what actually died in it?that will help in determining if it can be fixed.

This guy fixes them: https://www.maicsalazardiagnostics.com/
you will need someone with ability to flash stock mefi4b tune back on one IF yours is irreparable and whoever that is will need a copy of original tune.
I have good working mefi 4b ecms I can sell but again would need flashed with oem tune.

No sure what the problem is it’s my friends boat and he just said it was dead, will let you know

I was gonna buzz him and send it to him, thanks

[QUOTE=Raray888;4934391]Yeah, MEFI-4 ECMs are common. Any decent marine mechanic or a shop that specializes in Mercruiser can rebuild or exchange it. Try posting in local boat groups for a recommended guy.[/
1. mefi 4b is a discontinued ecm, there are no new ones available
2. "any decent marine mechanic or a shop that specializes in Mercruiser can rebuild or exchange them", so your typical marine shop that fixes boats isnt going to tear a ecm apart and start soldering in drivers, memory ic chips, circuits etc and "rebuild it" .There is no source to "exchange them" for mercruiser dealers thru any official network either.
3. The guy in texas who claimed for years to rebuild 10 of these a day ( a impossible task) to best of my knowledge subbed them out to a real electronic expert like the maic salazar I posted link to or OBD diagnostics, the most he did was open them to see how corroded they were and solder in a idle ciruit driver, his FB story now that whoever he had doing the work for him severed ties is suddenly that "most are beyond repair"

Ya, Right They are so common these days that you can pick them up USED for $1500 each. You know that back 10 years ago they could be had for $500. Think new Cost was $650. They have gone the way of Points and Condensor in distributors.

If you got a source and not just a suggestion I will buy as many of them as you got. They worked Great but with age things happen and they are real sensitive to being grounded out.

Well it looks like I have to send off 2 ecu, my friend said one ecu would basically only fire 4 injectors, the other ecu appears to not fire injectors or fuel pump, the one that only fires 4 injectors they switched ecu with the completely dead one and same thing only 4 injectors firing, will send off to see what that guy can do, does anyone do reflash with stock tunes, if they need it, thanks

were battery cables hooked up backwards at one time perhaps? The fact theres two injector drivers/ batch fire and one ecm will only fire 4 your ecm has a bad driver id think. IDK his business name BUT if you look up ben bowman on FB in kansas he has alot more stock flashes then I do and IF you find a replacement ecm can most ;likely flash it for you. IF its deemed your ecmz are zapped hard and cant be fixed, I do have several 4as and 4bs for sale, Smitty

[QUOTE=articfriends;4934392]This raray888 has no clue what he's posting about............Bot ? or Tool..........