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Old 11-08-2011, 12:10 AM   #5
a_seiler604
Registered User
 
Join Date: May 2010
Location: Honolulu, HI
Posts: 5
My Ride: 2003 BMW 325I
This may not be overly serious, but it's definitely not normal either.

The vibration/rattle always happens when the RPMs momentarily drop below ~650 (when engine is under added load due to turning wheel or switching on A/C at idle). There might be a momentary "shudder," but the engine quickly stabilizes like a properly-running car ... then the vibration/rattle will eventually stop ... then start again ... then stop. Intervals of around 30 seconds or so.

It certainly might be a "mystery noise" that doesn't affect the long-term health of the car, but I still get an occasional funny look when I stop at a gate/toll booth/stoplight/etc and the vibration/rattle starts. Annoying.
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