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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 01-31-2005, 12:33 AM   #1 (permalink)
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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?
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Old 01-31-2005, 05:53 PM   #2 (permalink)
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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
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Old 01-31-2005, 07:26 PM   #3 (permalink)
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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?
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Old 01-31-2005, 10:31 PM   #4 (permalink)
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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.
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Old 01-31-2005, 11:44 PM   #5 (permalink)
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well then i may just put my chip in this new one. thanks
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Old 02-02-2005, 02:35 AM   #6 (permalink)
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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.
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Old 02-02-2005, 04:32 AM   #7 (permalink)
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Quote:
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.
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Old 02-02-2005, 05:46 PM   #8 (permalink)
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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.
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Old 02-02-2005, 07:02 PM   #9 (permalink)
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it wont hurt anything to try, i test ecu's in different bimmers all the time
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Old 02-03-2005, 12:34 PM   #10 (permalink)
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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.
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