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Old 07-04-2007, 07:48 AM   #1
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Oscillation Help

Have a 2003 Boxster S. When driving at a constant RPM 2800 to 3000 rpm there is a oscillation from the right front of car. Happens in any gear. Not speed related. Stops instantly when removing foot from gas. This is not tire noise. This happens on a semi-regular basis as long as I have owned the car. Porsche dealer claims they nor Porsche has even has this promblem before!

Anybody out there see this ? Any ideas ?
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Old 07-04-2007, 09:03 AM   #2
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OK, let's check terms here... what do you mean by oscillation? Is it just a resonance/sound you hear or something you feel through the car seat or steering wheel as well? If sound, what sort of sound (high pitch, low, rumbling, etc.)?

Going only on the basis of what you've said so far, I'm guessing you have some sort of resonance going between a body part and the exhaust, esp. as it is not speed related but in sync with the RPMs (goes away with backing off gas). Does it happen while standing still and revving the engine to that range? If so, that would definitely rule out anything with the running gear, and you could try having someone stand outside the car to listen and get closer to the source.
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Old 07-04-2007, 06:48 PM   #3
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The oscillation is heard only. It is medium pitched.

Never thought to try to duplicate while not moving.
Don't know if it is possible as it doesn't happen all the time and
car does have to warm up before the oscillation starts.

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