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Severe vibration at 80 kmph (50 mph) V70-XC70 2001

posted by  someone claiming to be Jack Fishbourne on  Mon Mar 19 01:20 CST 2001 [RELATED]

I'm having an occasional severe vibration with my 2001 V70 T5 with DSTC. The milage is 1000 km (650 mi). When the vibration occurs, it can be felt in the entire car, not just in the steering wheel. When it first occurred at about 450 km (280 mi), the sensation was so severe, the chattering from whatever was causing the problem, was audible in the car and the entire car shuddered quite severely.

The vibration has a higher frequency than what one would expect from a problem with a tire/wheel/disk rotor/etc. It's frequency increases as the car speeds up. The higher the speed, the more noticeable the problem becomes. When it does occur, I can feel the vibration slowly increasing in frequency as I speed up until it becomes quite noticeable in the entire car. When I pull on the hand/emergency brake handle just enough to start to feel the car starting to slow down, there is a "clunk" sensation in the hand/emergency brake handle and the vibration ceases.

My dealer as examined the rear brakes, both the disk and drum/emergency brakes. They backed off the adjustment on the hand/emergency brake shoes as they were dragging slightly. This did not alleviate the vibration problem.

Currently, I have Volvo supplied (not dealer supplied) Gislavid Frost II snow tires (215/55 x 16) on Volvo steel wheels mounted on the car. They have been re-balanced and re-torqued when they were re-installed.

Any ideas?







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    Re: Severe vibration at 80 kmph (50 mph) V70-XC70 2001

    posted by  someone claiming to be B. De Denko on  Mon Mar 19 09:00 CST 2001 [RELATED]

    I recall a strange wheel balance problem from years ago on a friend's Porsche: there was some water in one tire and that created a migrating balance problem. But if the frequency appears higher than one would expect with wheel RPM, how about wheel bearings? Is the sound independent of the transmission being in a certain gear, any gear? Is it more evident under power or engine - deceleration? Is it even driveline related? Could there be some part of the undercarriage flapping in the breeze? Just some weird thoughts... BD







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      Re: Severe vibration at 80 kmph (50 mph) V70-XC70 2001

      posted by  someone claiming to be Jack Fishbourne on  Mon Mar 19 11:16 CST 2001 [RELATED]

      Thanx for the suggestions. The vibration usually occurs when I'm accelerating away from a Stop sign or red light. I feel it start becoming more and more noticeable/severe as speed increases. The frequency of the vibration doesn’t seem to change as the transmission shifts up in gear. And, as I slow down, the vibration reduces in severity. If something was flapping, I think that it would occur all the time which, naturally, it doesn’t.







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        Re: Severe vibration at 80 kmph (50 mph) V70-XC70 2001

        posted by  someone claiming to be B. De Denko on  Wed Mar 21 13:00 CST 2001 [RELATED]

        I noticed that the tire size is 215/55-16; that seems a little larger than stock. While it seems they should fit o.k., is there any chance of contact between the tire sidewall and the shock struts? Are the tires running true when they rotate? Was it a dynamic balance job? Is there any way to swap out all the wheels/ tires just for a test? Or even swap the fronts to the back? If it's not a bearing or driveline, I'd still be suspicious of possible tire-to-undercarriage interference. Quite a puzzle... I'm interested in what you discover. BD






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