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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 03-08-2009, 08:48 PM   #1 (permalink)
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wrong afm on my car

I was removing some old cold air intake junk on my car to put the stock breather on today. When putting the afm back on my box, I realized some parts house writing in the bottom reading "525i" and I have a '88 325e.

I was putting it back on due to rich running high idle, and also erratic idle. I thought the stock one would make it run better. Anyways, this is the wrong one for my car. Is it possible why my car is running so poorly? If so, any one know where I can get one? They are very expensive, the ones I have found.
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Old 03-08-2009, 08:58 PM   #2 (permalink)
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I don't think that has anything to do with anything...what's the part number?
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Old 03-09-2009, 01:18 AM   #3 (permalink)
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There should be a black plug on the afm, if it hasnt already been removed.. under it there should be a small adjustment screw to adjust your enrichment. Fuck with it a bit in half turns as the car idles until its not overly rich and you gain that nice smooth idle back. Also check that your icv is actually running. Lastly, if the idle is artificially high after all that, adjust the idle screw on your throttlebody. Its just a small screw you adjust with a flathead screwdriver.
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Old 03-09-2009, 08:19 AM   #4 (permalink)
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It idles high at times and low at other times. If I unplug the icv when its idling high, the car will die. If its idling low, icv unplugged does nothing to the idle. I hate to adjust anything when I think its something causing the erratic differences. I was hoping the afm was causing it........

I think I am going to just swap the engine....lol
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Old 03-09-2009, 03:49 PM   #5 (permalink)
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Yup, at high idle its completely ignoring the inputs from the afm because what its sending it is so far away from what it thinkts it should be its going off preprogrammed figures. (like a simple version of alpha n)

the low idle is either an improper idle adjustment screw, bad afm tuning, or bad icv.
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Old 03-11-2009, 08:13 PM   #6 (permalink)
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its always good to take out the ICV and hose it out with some brake cleaner
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