vibration in sterring wheel

[j930]

my 84 930 that I bought a few months ago has a vibration in the steering wheel that starts above 40mph and never really stops. it tracks very nicely so I don't think its a alignment issue. I am thinking either balance or are there any rubber bushings that are up in the front end that keep everything nice and tight?

[gsxrken]

Very likely tire related. Either flat spotted from sitting or out of balance. I just went with new kuhmos and it cleared up the vibration I had.

[IMR-Merlin]

a few things can cause this. Tire balance would be the most likely culprit, as Ken said, flat spot.... A rim that is out of true could cause this. First thing I would do is pull the wheels and have them balanced. While they are off, clean any corrosion off of the mating surfaces between the rims and rotors. Just a little bit of gunk between the 2 can cause vibrations.

[e170drvr]

J930, I had a similar problem with my 87 930. The vibration started at around 60 mph. I was convinced that it was a balance issue, I had the local tire shop install new tires and balance, still had the problem. I just recently took it in to have all four balanced again, and I asked the guy to remove all the weights and start over, and it worked this time no vibration at any speed. I think the first shop just did a crappy balance on the wheels. A fellow on here had a great suggestion, remove all four yourself, remove all the weights and clean the wheel really well then take them down to the tire shop for balancing. You might try that first since it is cheap, and a good chance that it is your problem.

[fredmeister]

It could also be a tire that is delaminating. I had a similar issue with a vibration that occurred above 60mph. Balancing the wheels did not fix it until I rolled the tires around on the ground off the car and saw the tread had separated slightly on one tire. Could not see it on the car. Only until actually rolling the tire along the ground and watching it as it rolled.

[A930Rocket]

Can a tire(s) that has flat spotted from sitting too long be corrected somehow? Will driving it more or balancing it help?

[IMR-Merlin]

Originally Posted by A930Rocket

Can a tire(s) that has flat spotted from sitting too long be corrected somehow? Will driving it more or balancing it help?

Maybe a few heat cycles will cure it....

[A930Rocket]

That's what I'm thinking. I must have let her sit too long...

[j930]

I will try all of it

[IMR-Merlin]

Just for reference, I have seen cars come into my old shop with vibration problems. One came in with a lot of wheel vibration. We pulled the wheels and balanced them, but the car still had this vibration. After a little discussion with the owner, we found out that he had the front brakes replaced. We pulled the rotors (floating style, not bolted down like your car) and there was a little bit of rust that had fallen between the rotor and hub. Cleaned this up and the car was smooth as silk. Not all solutions are this easy, but try the easy stuff first.

Pull the wheels, have them balanced, clean all the corrosion off the surface between the wheel and spacer, look at the surface of the hub centric if applicable and clean it up with a scotchbrite pad. If this doesn't work, look into someone who has an old school highspeed balancer, you may have a tire that is going bad, but balances fine.

Hope this helps