dexter860 Posted January 10, 2019 Share Posted January 10, 2019 Ecm went out of my 95 Ch 613 , E7 350, borrowed an ecm from shop to get home , found a place in Texas that "thinks" they can repair mine , but most places have never seemed to work on these older ecms. Mine only has one big box on passenger side under glove box , we took the one out of our 96 and it has the big box and a smaller box that says Bosch on it , and they have different connections, so that didn't work. Can't find any used ones anywhere my part # is 12MS54M5, the one I'm using is 12MS54M7. I find alot of the ones with the number ending in M7 but no M5, I wonder what the difference is , the one I'm using now is an M7 , it seems ok but my speed is off and truck seems to surge a little more at idle, I think mine is a vmac 2 , but not sure , can I swap a box out of a 427 , into a 350? Dealer says new one is nla. Quote Link to comment Share on other sites More sharing options...
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