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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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#1 (permalink) Old 04-20-2009, 11:47 PM
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ECU question

I tried to install a performance chip in my 1991 325i bmw and I messed up the ecu, its model number was 0-261-200-525 so I bought another ecu with a model number of 0-261-200-173 and has a stock chip in it, but its running better. What I want to know is WHY???? I know its not a bad thing but this info will help me figure out what type of performance chip to buy and so forth. Oh and I'm new to the site just fyi. So any input would be great, thanks.
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#2 (permalink) Old 04-21-2009, 12:55 AM
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might be running better because all the soldering is good.

From what i understand the ECU's from E30 have weak soldering and they can crack or just come apart, causing issues obviously.

I know my E30 has an issue with its ECU because intermittently it wont start or idles weird. I tap the dash near the ECU and itll work again. This happend before and after i installed a performance chip.

Atleast thats what a BMW mechanic told me.

So obviously you got a good ECU

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#3 (permalink) Old 04-10-2010, 07:26 PM
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Make Sure The Ecu Has Good Mounting Earth To Frame Or You Could Get These Problems I Had Them Making Me Think The (brain) Was Dodgy
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