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      11-18-2012, 09:11 AM   #29
stefan
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Drives: M2 Comp
Join Date: Feb 2008
Location: North

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If you have vibration within a narrow speed range (as you say, 100-120 for example), it is MOST likely wheel balance (unless you car pulls to hard to a side while braking, or if the wheel shakes when turning one direction).

So; if you feel it in your hands--it's probably one of your front wheels or both that need balancing. If you feel it in your butt, it's probably the rears. Many tire shops have difficulties getting the balance perfect and runflats only make this more difficult. Keep pushing your local shop until it's 100%.

RPM-based vibrations is another story. If it's occurring around 3000rpm I'd think maybe that has something to do with VANOS but is either way very serious.
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