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quiksilver

Noise/Vibration suddenly at 50mph until 80mph

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'Appears' suddenly at 50mph, once over 65mph it starts to disappear till 80mph where it's effectively gone.

It can be felt in the seats, steering wheel doesn't shake. The tires have recently been balanced and a 4 wheel alignment was done at the same time.

I looked through previous posts, and prop shaft/center bearings seem to be the main culprits; is either of those causing this problem?

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This might not be what you're feeling, but the heat-shield on my car, by the cat, likes to make contact with my driveline and make some mysterious noises. I recently reinstalled it with new nuts (and larger washers) to try and hold it in place better. There's such a little amount of room there that the slightest deformity lets the thin tin contact the driveline. In my case, it'll start making noise around 30mph, and go away around 50-60mph, and sounds like something under there's going to come apart with a speed-variable thwacking sound. HTH!

OTOH, a vibration that can be felt in the seats, but not in the steering wheel can indicate a vibration coming from the rear of the car. A wheel could still be out of balance, or if you have aftermarket wheels (or wheels off of an XC90 with larger center bores), you'll get a vibration too if they're not hubcentric to your car.

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This might not be what you're feeling, but the heat-shield on my car, by the cat, likes to make contact with my driveline and make some mysterious noises. I recently reinstalled it with new nuts (and larger washers) to try and hold it in place better. There's such a little amount of room there that the slightest deformity lets the thin tin contact the driveline. In my case, it'll start making noise around 30mph, and go away around 50-60mph, and sounds like something under there's going to come apart with a speed-variable thwacking sound. HTH!

OTOH, a vibration that can be felt in the seats, but not in the steering wheel can indicate a vibration coming from the rear of the car. A wheel could still be out of balance, or if you have aftermarket wheels (or wheels off of an XC90 with larger center bores), you'll get a vibration too if they're not hubcentric to your car.

Stock meteors are on the car.

I'll check the heat-shield tomorrow.

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Classic wheel balance speeds. 55 -75+

Have the balance rechecked, I'll bet they're...

(Your choice here)!

Out of balance

You have an out of round tire

A wheel may be bent

...and yes, feeling it in the seat and not in the steering wheel means your problem is definitely in the REAR

If you want to do it the easy way, first just swap the front tires to the rear and see what happens.

If you have vibration thru the wheel, you know the problem is in the rear wheels and tires (now on the front)!

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Thanks Jim for the assessment; sounds right - I went through that many times. These cars are oh so sensitive to wheels out of balance.

Moving to wheel & tire sub-forum.

Rob

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Okay, thanks guys.

I'll get the shop to check the wheel balance again sometime this week.

So there's no possibility of this being drive-shaft related?

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Anything and everything is always possible

That is a classic piece of of JRL advice!

Anything that rotates can be:

- out of balance

- out of round

- out of alignment

Trent

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I'll get the shop to check the wheel balance again sometime this week.

So there's no possibility of this being drive-shaft related?

As mentioned by others... start off with the wheel balance, and then once that is rectified as a source of the bad vibe, go further.

No sense in worrying needlessly about worse issues... start with the simple solution - these cars are indeed sensitive to wheels out of balance.

Positive vibes sent to ya!

Rob

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Sounds a little like the 50-65mph vibration I got in our now-sold early 98V70XC. Started at 25k, disappeared when new driveshafts went in, but always came back. Tires/wheels never affected it.

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Im in the wheel business. Out of round tires, bend wheels, or play in youre front suspension. Jack the front of the vehicle off the ground, keep wheels and tires on the car. Grap wheels at 3 and 9 a clock(shake the wheels left and right, any play in youre suspension you will see it)and then 6 and 12 a clock ,

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