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Old 10-24-2007, 08:46 PM   #1
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Default Vibrations at highway speed

My wife'* 2000 SSEi has a vibration at 60-75mph, and I'm not sure if it'* warped rotors, tire balance, or some sort of alignment issue. What are some general ways to check what might be causing a vibration? Feels like it'* coming from the front end, particularly the right front. The car also pulls to the right when you let go of the wheel. The vibration seems slightly more noticeable when you use the brakes, but not enough that it has me convinced it'* a rotor issue.

What should I try first? Should I just take the car to an alignment shop and have them check it out?

(By the way, I put this in General because I figured any solutions would be applicable to all years, not just 2000+)
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Old 10-24-2007, 09:24 PM   #2
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My 97 has a similar vibration at those same speeds. Over the years I've tried various things to diagnose it, and the best I've come up with is having the tires rotated and balanced, to see if it made a change, and it did. However, within a month or so, if the vibration had gotten better after rotate & balance, it would be just as bad again. Brand new tires made it go away, but after a few months of driving, it is always back.

Tire dealer tells me I need new struts, points to slight cupping wear on my tires. I spoke with a coworker who used to race cars, and he agrees with this assessment.

I've had brakes done with new rotors, no change in vibration, so I suspect this is not a warped rotors issue, although you typically hear from several members who did get vibration because of warped rotors, so it'* definitely something to check.

If you have the luxury of swapping new tires on, that'* a pretty big giveaway if your vibration goes away.

For now, I just drive it as-is, but some time soon I'll probably have struts replaced around the time I'm due for new tires.
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Old 10-24-2007, 10:00 PM   #3
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This has been a common theme for the 2000+ Bonnevilles. No one solution has been found that works for everyone. Doing a search for vibration in the 2000 - 2005 section will give you an idea of things that have been tried. These cars use lighter suspension components and are more susceptible to vibrations. Some have found relief after Hunter Road Force Balancing. There is a TSB for the problem. TSB
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Old 10-25-2007, 07:56 AM   #4

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With the pulling..I'd direct the attention there. A collapsing brake hose or sticking caliper can cause a pull. Alignment can also cause a pull and bad enough alignment for enough time can cause the tread on the tire to wear unevenly. That could cause a vibration as well.
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