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Old 05-10-2001, 10:10 PM
John Plut John Plut is offline
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Join Date: Apr 2001
Location: Joliet Illinois
Posts: 309
Ghost Noise

I've had a couple Volvo's that made that noise and it was caused by the center support bearing on the drive shaft. The sound is kind of a cycling whine that changes octave with the speed of the car.

I'm not very familiar with Mercedes yet and I'm not even sure if they have a center bearing on the drive shaft but if they do I would strongly suspect that's the problem. A test I've used on Volvo's to tell if the bearing is the cause is to use a grease gun with a grease injection needle and shoot some grease into the bearing through the rubber seal on its side. The noise is usually caused by a dry bearing and the grease will temporarily stop the noise. This should not be done as a permanent fix though.
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