Vibration issue on the highway.

[RyanHeo]

Hi.
I have a infiniti i30 which is 130k on it. It has a vibraiton over 60 miles. Especially at the 75 miles the whole car is vibrating not even streering wheel. After 75 miles it is getting weaker. So I had been the repair serveral time(5~6 times) to align my wheels. They told it is perfect alignment. The shocks, cv joint, and tires are fine. But it is still vibrate. What's wrong?

 

[meep]

tires may be out of round. they can be balanced but still out of round. This sounds like the case to me.

 

[PT1]

Have your wheels "road force" balanced up to 100mph by a competent tire shop. If you have custom chrome or aluminum wheels make sure they use the adhesive strip weights that stick on the inside center of the rim versus the ones that hammer on the outside edge of the rim.

 

[RyanHeo]

I don't have a custom wheel. It just has factory alloy wheels. I don't want to go the shop again. They hate me and my car.

 

[Quest]

yes, in addition to "road force" balancing your tires, a decent tire balancing check would be a good way to start.

You'll be genuinely surprised how many vehicle shimmy/shakes/vibrations are caused by bad tires.

Q.

 

[oily boyd]

Ryan,

What tire and size are on the car?

How many miles on tires?

Does the shop specialize in diagnosing drivetrain vibrations? You should seek that type of shop for help.

If shocks etc. are OEM, at your mileage I'd bet they are probably shot despite your shops diagnosis.

Did you check for cupped tires? Easy to do, just jack the car up, spin the tires and feel tread as the tire goes around.


Finally, your problem may have started a long time ago (but was small enough in amplitude that you didn't notice it). As the tires are getting older the problem is just getting worse (separating tread or whatever).

More questions than answers in my post - sorry!

 

[RyanHeo]

The car has 130k now. And the tires is also good. I will go to the shop again tomorrow. And the shop is tire specialist shop(Northwest Tire)

 

[Cutehumor]

if they sent me home and didn't fix the problem, I would force one of them dudes to ride me while I drove the vehicle 60mph and up so they can see the car vibrate!

 

[Ray Garlington]

Quote:

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The car has 130k now. And the tires is also good. I will go to the shop again tomorrow. And the shop is tire specialist shop(Northwest Tire)

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If your tires and suspension are good, you probably have a bent wheel or two. Those alloy wheels bend fairly easily, and, surprisingly, some tire shops don't pay any attention to that when they mount new tires. I've seen them mount up a new tire on a bent rim, hammer on a couple of ounces of weights and call it good.

Based on your description, the bad wheels will be obvious. Just jack up the car, spin the wheel and look at the rim as it spins. If you see any 'wobble' that is your problem wheel. To see smaller variations, use a jackstand to hold a wooden dowel or similar against the wheel (for reference)as it spins. Look at side-to-side and in-out variations in trueness. (In-out are the worst)

 

[mechtech2]

Bad tire, bad wheel, bad brake rotor, [or bad wheel bearingor suspension component that makes any problems feel much worse].
But probably bad balance.

 

[rpn453]

Try moving the tires around to see if you can narrow it down to a specific tire.