Question about 2000 BMW M Series

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Starting at about 20 MPH I get a low rythmetic rumble about every 15 to 20 sec. apart that not only drops the rpm by about 50 but also makes the MPG gauge dip a bit also. This stops if I am going 70 or better, no codes or engine light, trans serviced no affect BMW mech. Have no idea??? Help!

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  • Mobyz28 May 27, 2011

    If i could get a little more information from you i might be able to help. If you get up to 20 miles an hour and the rumble is present, if you shift into neutral does the noise go away or does it stay? what about if you put it into a differant gear if it is manual or lock out over drive in an automatic?

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The only thing I can think of that would happen at time intervals that far apart is the air conditioning compressor kicking on and off. The idle air control is supposed to compensate for this to keep the RPM steady, but if you have an air leak in the intake tubing, or dirt in the air valve, I can imagine that it might be more noticeable. My theory would be consistent with the fact that you don't notice it at highway speed when the engine is pulling harder and running faster. I would not worry too much about it.

Posted on May 27, 2011

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