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My most expensive mod ever
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Discussion Starter #1
Well, I searched through all these post and found nothing that matched my problem so I'm going to through it out there and see what you all think.
A Little background first - 2004 GTO Cosmos, M6, all stock, 1800miles.

Problem -
I noticed shortly after taking the car home that there is a vibration in the stearing wheel while on the freeway. Seemed to come and go. Took her back to the dealer and had them check it out. They immediately told me they test drove it several times and found nothing wrong. I demanded that they check the balance on the tires which they finally did do after threatening to take it to another shop. The results where that all four wheels where an inch out of round at several different tire pressures.
I was correct...go figure, I knew MY CAR wasn't driving right, surprise right?

Anyway, a week later, the car seems to be starting to do the same thing.
But a little different now. Every morning when I first get on the freeway for about the first mile or so the stearing wheel shakes, then it goes away for the rest of the ride. Seems everytime she sits for a while before being driven the shake comes back.

Any ideas on what could be wrong.
I wanted to get your thoughts before I go back to the dealer again.
 

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Don't know how you could have missed this in a search. The tires will flat spot on you when sitting overnight and after a little driving they go away. There have been a few threads on this subject. This is normal for low profile performance tires. Nothing to be concerned about. Glad they took care of the first problem though.
 

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I think this topic has been discussed before ...

My Goat's steering wheel slightly vibrates when driving on the highway (around 60 mph). A lot of people on this board has complained about this and so far no one knows how to fix it.

Gianni
 

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I like boobs.
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Do you find yourself going across areas with a lot of gravel in the road? I have a gravel driveway and often a rock will get stuck in the tread until it decides to pop back out while driving at faster speeds. That would clearly cause vibration in the wheel at 60mph until it came back out.

Also, check the lugs to be sure they are all equily tight.
 

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My most expensive mod ever
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Discussion Starter #5
That makes sense, the flat spot from sitting overnight.
Thanks.
No point in going back to the shop then I suppose.
Just what we all want tire issues right?!!

I must have missed it in the search some how.
(now ask me if I care....)
 

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Gianni D said:
I think this topic has been discussed before ...

My Goat's steering wheel slightly vibrates when driving on the highway (around 60 mph). A lot of people on this board has complained about this and so far no one knows how to fix it.

Gianni
If it is vibrating at 60 when the tires are warmed, not just a first thing in the morning thing, then you might need a dynamic balance where they balance the wheel to the tire. Mine was fine from the factory but when I put on the aftermarket wheels it had a very noticible vibration in the steering wheel around 60. Discount Tire then did a dynamic balance and compared the new wheels to OEM. The OEM's were actually a bit more out than the VOXX replacements. Smooth as glass now, they must dynamic balance at the factory.
 

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Former GOATilicious SEG lover
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If you don't drive alot over 50mph constantly, you might edge up your tire pressures (or check your pressures - 35psi cold I think is OEM - might try 37psi or the like). Tires tend to not flat spot as much at higher pressures, one reason why cars tend to ship with higher than normal pressures so they don't flat spot.

Also, keep in mind that most dealerships still aren't as familiar with our "euroflange" style wheels as regular flanged wheels, as they require different weights and procedures...
 

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Loyd @ SNL Performance
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My Dealer replaced all of my tires for the same problem...
they said excesive runout... whatever that is.
 

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About.com definition:

RADIAL RUNOUT

Definition: Variation (out-of-round) in the radius or circumference of a wheel or tire. It is measured by placing a dial indicator on the inside edge of the rim or tire tread. Too much radial runout can cause up-and-down vibrations similar to those caused by a static imbalance.
 

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My most expensive mod ever
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Discussion Starter #10
Well, I do all freeway driving. 23 miles twice a day from Akron to Canton. She rearly gets city miles. We take the other car when parking at a public lot is involved. It really is irritating that every morning the stearing wheel vibrates badly for the first couple of miles. Makes me want to take it back every time! :banghead:
 

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I took my GTO in today to have the same shaking steering wheel problem fixed. The thing is though, I went to the independent garage that I always use for alignments. I had all four wheel balanced and a four wheel alignment done. This took care of the problem for me. The car tracks straight with no shake. I was told that all of the wheels were out of balance and that the left rear had toe out and the right rear had toe in.

Frank
 

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That'd definatly do it.

Sable, i'd insist that they check the wheel balance and alignment. The WRX had a similar problem and it was the wheel out of balance bad.
 

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Best Car Under $45k Period.
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I am taking mine in next week (it also pulls to the right). My WRX had the same problem. I might just skip the dealer and pay and have a pro do it. I know I will get pissed when they say "we could not duplicate the problem".
 

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I actually prefer to have my alignments done at this independent garage. I've been going to them for the past 4 years. The total bill was a little over $110 and they set it up at a happy medium for street/auto-x use. The GM dealers that I have used in the past have always farmed out alignments anyway.

Frank
 

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My most expensive mod ever
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Discussion Starter #15
Just got back from the dealer. They claim they have heard nothing about this problem from anyone else. I made an appointment to take it in next week. I'm going to take a half a day off so I can talk to the shop guys myself without just dropping it off.

Thanks for all the good feedback on this subject everyone!
 

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My most expensive mod ever
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Discussion Starter #16
Found out why the shop hasen't heard anything about the problem.
The dealership has only sold 6 GTO's and 5 of them are weekend/storage cars. I'm the only person driving on a regular basis. I'm sure that might have a lot to do with why I'm the only one having problems with the tires. She's going in Tuesday and will be getting another look at the tires and they are going to do an allignment on her.
I also called Pontiac and they told me they haven't heard any similar complaints. They stated that they do not take anything in these forums seriously because they are not credible. Maybe they should.
 

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My most expensive mod ever
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Discussion Starter #17
Well, I got her back from the shop and they said they weren't able to find anything wrong this time. They did admit that they could feel a very slight vibration in the wheel but they think it is just the suspension being so stiff that it's picking up the imperfections in the road.
I had them re-check the tires and balance them and the alignment.
They said they found nothing wrong and that the alignment was not off.
They also checked the drivetrain and the suspension and everything checked out OK. The manager put in a note to engineering and said if he heard anything that he would let me know.
Now what???
Am I stuck living with this? It's only going to bother me everytime I drive it!!
:banghead:
 

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You may want to ask how they do the balance. Usually at a high speed, it’s from an out of balance tire. A lot of dealers, not all, have what is called a Force Variance Balancer. It has a computer drive that will measure the run out of a tire and a wheel and will also match the tire to the wheel.

The machine has a barrel that fills with air and presses on the tire as it spins. It will let you know how much variance is on the tire as it spins so that it will detect a high spot or an excessive overlap on the belts in the tire. These machines work very well when you have someone who is certified working on it.

Cold flat spots are not a safety issue but are very annoying. What causes this in most cases are the polyester plys within the tire.
 

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Same problem with mine since new. I took it to an independent tire specialist and balanced the wheels. The shaking at 60 mph was reduced but I still get a bit on a concrete highway on the way to work. It doesn't seem to be as noticeable on smooth tar. Not sure about temporary flat spotting from sitting overnight-- I have had other cars with lower profile tires (C5, 996 & a Maser coupe I still own) and this never happened.
 
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