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96 850 GLT Wagon rear vibration

Hello All

I own a 96 850 GLT Wagon 160,000 miles and going strong!

My issue is that I have this odd vibration that comes and goes at about 70 mph. The best way to describe it is a slow pulsing vibration. It seems to be coming from the rear passenger side. I've had the tires double checked and they are perfectly balanced, my mechanic replaced the shocks as one was bad, but it still vibrates. I've had my mechanic check it over several times but he can find nothing.

One clue - if the vehicle is loaded with luggage etc the vibration is barely noticeable it is much worse when the vehicle is empty.

Could this be a suspension issue? Do I have a bad tire? Maybe a bad bearing? Could it be a rubber bushing is missing?

Thanks in advance for your thoughts.

Regards Russ

Reply to
Russ
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Going out on a limb here -- a "slow pulsing" sounds like a harmonic imbalance. You might try moving the rear tires to the front and vice-versa. Might cure the problem and might move the problem to the front in which case it's a tire issue -- possibly a tire balance issue since it sounds to be speed specific.

I would try this first.

Oh, yeah, you could also try observing the speed limit and the problem wouldn't occur. But what's the fun in that, right?

Chuck Fiedler Nothing but Volvo since 1974

Reply to
Chuck Fiedler

How do you know he's not? There's a number of areas around here where the speed limit is 70 mph, and some states are higher than that.

Reply to
James Sweet

Chuck

Thanks for your reply I will try swapping the tires around and see what happens.

As for the speed limit, Yes in Florida the highway speed limit is 70 mph. That's what makes this so annoying. I have to go faster that the speed limit to make it stop, which risks a speeding ticket or go slow and upset the other drivers.

Anyway, Thanks for the reply.

Regards Russ

Reply to
Russ

Lighten up.

Reply to
Chuck Fiedler

Actually, that rather confirms my suspicion -- a speed-specific vibration tends to be a tire/tire balance issue. Right now you need to isolate the cause and swapping the tires around should do so.

Chuck Fiedler Nothing but Volvo since 1974

Reply to
Chuck Fiedler

Russ

If your tyres as still good get your local tyre blokes to re-set and re-balance the tyres on the wheels.

Reply to
Alistair Ross

Hello All

I went tried all the suggestions here in the group and the problems did not go away. So I finally took the car to the tire store where I bought the tires. Long story short - I had THREE bad tires that would not balance on a force balance machine.

Under the warranty conditions I got 75% of the value of the three bad tires applied to the replacements. I ended up buying a fourth one just because I didn't trust the last one.

I talked with the tire guy and he said it is uncommon and surprising that I got three bad tires but I am really shocked. This is not a statistical anomaly. I could see one or maybe two but not three.

What are your thoughts?

Regards Russ

Reply to
Russ

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Someone

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