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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 10-24-2004, 11:49 PM   #1 (permalink)
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Ok well everymorning when i start the car the idle slows like 300 and the RPM drops and comes back up. It does it everyonce in a while at a light or stop sign.

Is it cold engine or what?

I was also thinking it could be that vacuum thingy?
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Old 10-25-2004, 12:16 AM   #2 (permalink)
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mine did this when it was cold.... (below 70)
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Old 10-25-2004, 01:02 AM   #3 (permalink)
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yea its generally when its cold, just bothers me
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Old 10-25-2004, 01:04 AM   #4 (permalink)
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check your spark plugs they can make your idle rough when its time to change them

David
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Old 10-25-2004, 01:41 PM   #5 (permalink)
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thnx everyone.


Ill check it out.
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Old 10-25-2004, 10:34 PM   #6 (permalink)
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when i bought my car, it needed long crank time when cold... but then i put in the fuel pump pressure check valve from BMW that i found out about here and it sort-of helped. after few weeks, it began starting really quick in the morning (and there wasnt gas odor smell as i could smell it before it began starting perfectly.. funny) moreover, even the cold start valve works now i guess since it revs up the engine to about 1600 rpm for a couple of minutes when not in gear... but then sometimes (and this happens only in the morning when it is cold) the rpm revs between 1000-1500 up and down which did not happen before even though the IDLE was never perfect...

so is this that the car just started acting properly but there is still something wrong with the idle control module???
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Old 10-25-2004, 11:52 PM   #7 (permalink)
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well mine doesnt jump that much, just like 300 RPMs. so at the most it will go up to about 1100, and down to 500
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Old 10-27-2004, 12:21 AM   #8 (permalink)
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i have had two e30's and they both do the same thing, i have asked around and everybody says that they are notorious for rough idle
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Old 10-27-2004, 01:36 PM   #9 (permalink)
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Originally posted by bimsupreme@Oct 26 2004, 11:21 PM
i have had two e30's and they both do the same thing, i have asked around and everybody says that they are notorious for rough idle
[snapback]219275[/snapback]

hmp well oh well.
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