ECU differences?

Post your E12 technical questions and comments here. Please, no off-topic posts.

Moderators: Mike W., Pierre

Post Reply
canada karl
Posts: 1065
Joined: Tue Jan 06, 2009 3:50 pm

ECU differences?

Post by canada karl »

What would happen if I swap in a 1976 E12 ECU into a 1977 E12 with 77 ECU? 76 is 5 speed and 77 is Auto otherwise the cars are virtually the same. The only difference being the "last digit" in the code number on the ECU? Would it likely work or would I somehow do damage to internal wiring?
1976 530i. BMW 59 Triumph TR3A(rolling resto). 67 Triumph TR4A(salvageable). 86 900S Winter car
User avatar
Mike W.
Posts: 2798
Joined: Wed Aug 30, 2006 12:12 am
Location: Sonoma County

Re: ECU differences?

Post by Mike W. »

If you're referring to the 002 and 004 ECUs, they are interchangeable. I suppose there must be some difference, but I have no idea what. If you're talking 528i ECUs, those I would not interchange.
Mike W.



1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
Post Reply