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baaderapple

Intermittent Uncontrollable Vibration at Highway Speed

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I mentioned this problem a few months back in responding to another thread but I'll elaborate on the problem. I have experienced an intermittent violent shaking of my 2007 V70R which is really unsettling. I have been experiencing ongoing vibration problems and have been trying to solve the problem for several months now. I believe the constant vibration through the steering wheel and even through the seat is a result of tires and rims (most likely). I have replaced both front half shafts and still experienced the constant vibration. To further eliminate possibilities, the mechanic removed the rear shaft for a few months. That didn't solve the vibration problem, but the intermittent violent shaking did go away. Yesterday, I had the mechanic put the rear shaft back on, and took the car for a drive on the highway. About an hour into the trip, the shaking began. It starts as a low frequency hum which builds in intensity slowly. After about 30 seconds, the whole car is shaking violently, to the extent that I cannot see a clear image in the rear view mirror as it is shaking around so much. The noise becomes a whap-whapping sound, like helicopter blades, I think coming from the engine compartment, but it's difficult to say as the noise in the car cabin is so loud it's difficult to identify the source. Engine response is very sluggish during the shaking. Slowing down or speeding up has no effect. After several minutes, the shaking slowly goes away. Any thoughts?

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this sounds crazy.

 

probably more than one issue.

 

have the mech look at the viscous coupling. something in the driveline is messed up.

i wonder if a tire balance weight is loose and spinning eventually gets it centered.

 

most of the whinning i've heard of are wheen bearings.

 

 

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