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Old 11-06-2011, 07:03 PM   #1
a_seiler604
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Join Date: May 2010
Location: Honolulu, HI
Posts: 5
My Ride: 2003 BMW 325I
Question Low vibration/rattling at idle

Hello, everyone. My '03 325I M54 (90K miles) has a sporadic, low-pitched vibration/rattle at idle (~700rpm or less).

The vibration started immediately after I replaced gaskets for the valve cover and oil filter housing assembly (due to small oil leaks). It's a very low-pitched sound/vibration and kind of sounds like it's coming from inside the engine, although I can't be sure. I've put a stethoscope all over the easily-accessible parts of the engine, but can't pinpoint any source. The sound/vibration only happens sporadically at idle (more often when A/C or PS is engaged), and it never occurs above idle. You can hear the sound best either inside or underneath the car--less so when working under the hood due to pulley/belt/etc noises. No warning lights on the dash and no trouble codes from my OBD scanner. I think it has to be associated with the gasket replacements I did ... but I'm at a loss as to what the problem might be. The car runs very smoothly otherwise.

Appreciate any advice. Thanks.
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