Quick Question

[BMW@JMU]

I recently got a hold of an ECU out of an '86 325. Can I put this in my '85 325e? It ends in 027 where mine ends in 021. If I'm correct the same performance ship can go in both so these ECU's are interchangeable, right?

[e30fanm3]

as long as it wasnt an "i" car it should work, and yes the chips are interchangeable as long as they are the same motor

[BMW@JMU]

that's what i was thinking. thanks a lot.

by the way, does the ecu have anything to do with idle stability or is that all left up to the idle control valve. before i put this new ecu in, my car's idle was a bit unstable, but once i put in the one out of an '86 it has a more constant idle. am i just imagining things?

[Kowalski]

Originally posted by BMW@JMU@Jan 31 2005, 06:26 PM
that's what i was thinking. thanks a lot.

by the way, does the ecu have anything to do with idle stability or is that all left up to the idle control valve. before i put this new ecu in, my car's idle was a bit unstable, but once i put in the one out of an '86 it has a more constant idle. am i just imagining things?

[snapback]283575[/snapback]

no the computer takes all the information and calculates it and decides how much fuel to give it, thats what all the sensors are for. so maybe this ones programed different and its distributing things better.

[BMW@JMU]

well then i may just put my chip in this new one. thanks

[Kowalski]

Originally posted by BMW@JMU@Jan 31 2005, 10:44 PM
well then i may just put my chip in this new one. thanks

[snapback]283868[/snapback]

giv'er a wirl and let us know how she fairs.

[bddog]

Originally posted by Kowalski+Jan 31 2005, 10:31 PM--><div class='quotetop'>QUOTE(Kowalski @ Jan 31 2005, 10:31 PM)</div><div class='quotemain'><!--QuoteBegin-BMW@JMU@Jan 31 2005, 06:26 PM
that's what i was thinking.* thanks a lot.

by the way, does the ecu have anything to do with idle stability or is that all left up to the idle control valve.* before i put this new ecu in, my car's idle was a bit unstable, but once i put in the one out of an '86 it has a more constant idle.* am i just imagining things?

[snapback]283575[/snapback]

no the computer takes all the information and calculates it and decides how much fuel to give it, thats what all the sensors are for. so maybe this ones programed different and its distributing things better.

[snapback]283787[/snapback]

[/b][/quote]
The 325E has an idle control module located by the ECU. This and the ICV control idle.

[BMW@JMU]

So, if my idle improves with the new ecu, then that means my icv is good by my old ecu may have something wrong with it, right? I'm just debating whether or not to put this new ecu in. I hope it won't mess anything up in my car. Thanks for all the posts so far.

[e30fanm3]

it wont hurt anything to try, i test ecu's in different bimmers all the time

[BMW@JMU]

Sounds like a plan. I get to go home tomorrow to get my ecu with the chip in it. Hopefully there will still be enough snow here to make a drifting video with my roommate.