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      07-03-2019, 09:24 PM   #1
Mike1992
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Rpm Inconsistent

So my car(2011 m3 almost 90k miles ) idles around 650-ish and some other times idles around 550-ish same weather no Ac
But I’ve noticed if I drive more than say 40 minutes it drops from 650 to 550
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      07-07-2019, 07:21 PM   #2
Scrippy
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Tune up time? Plugs and air filter and if it persists maybe look at TA's, idle control valve or tank breather. Obviously a code reader would help. If the RPM drop is after a fill up then most likely tank breather.
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      07-07-2019, 08:07 PM   #3
wfdeacon88
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That's normal for me.... it is slightly different from time to time. Not sure if it's normal for this car, but mine does the same small variance from time to time.
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      07-22-2019, 12:20 PM   #4
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I haven't driven my M3 around that much since getting it, but I have noticed that it doesn't idle higher while the AC is on compared to my 335...my 335's rpms would bump up a bit when I was in drive mode and with AC on. Once in sport or manual, it wouldnt do it much. With no AC on, it wouldn't do it at all.
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      07-22-2019, 12:55 PM   #5
Mvy
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Bouncing RPM at idle is commonly associated with the idle control valve or tank breather as Scrippy noted.
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