Difference between the e34 and e36 m50 dme's?

[m3_madbimmer]

first of all let me introduce myself. My name is Luke and i've owned numerous 3 series bmw's but this is my first 5 series. a 91 525i

now my DME went bad on the car and i got a replacement for it from a buddy of mine out of his 325i. The e36 was a non vanos car which is the same as my 5 series so i figured the DME's would be the same since they share the exact same M50 engine correct?

well the e36 DME ends in 402 where the 525's DME ends in 405. I tried the 402 on the 525i and it runs but it seems like at the lower rpms it acts a little strange.

anyone know what the differences are between the two dme's?


anyone know where i can get a 405 dme for cheap?

[Blitzkrieg Bob]

http://www.pelicanparts.com/BMW/tech...DME-Repair.htm

You could also swap the 405's chip into the 402 if the chip is still good and it's just the DME board that's bad.

[Dave M]

402 and 403 should work in place of the 405. The 405 was used up to 9/91, the 402 and 403 were used after 9/91. Not sure what the difference is, but word on the street is that they are interchangable.

[m3_madbimmer]

ok thanks guys. i have a Mark D chip so i'll just throw that into the 402 and should be good to go.

thanks for the verification