Rotate your front wheels and see if the vibration comes from the other side. The most important thing will be to see if it really is the tire/wheel or brakes/rotors. I have a mystery vibration on my audi that I believe will never be fixed. And you nailed it, 80mph is the sweet spot. Nothing I can do. Its not terrible, I can deal with it. And my lease is up in a month, so I dont care any more. I just bought a new g35 sedan 6mt and had a vibration and they replaced all brakes and rotors and that fixed it. But remember, even rotors sometimes need to be balanced. You just need to take time find the cause yourself, because you will waist time and money if you have an infinity tech try to figure it out for you.

But if you insist, get printouts of the wheel balancing and alignment and check to see if everything is in specs. Also, try inflating the tires a bit more above recommendations. this will give you more road feel and should help you identify the cause better. Some techs will deflate your tires to cover up the vibrations.

 

Listen to this ^...
A bad tire is your MOST probable cause.

 

Do you have a 2nd set of rims/tires you can compare against? e.g. snow tires (not sure where you live...) it'd be a good test to swap out the rims/tires and see how it rides...Just a thought...

 

just swapped out all 4 wheels with a fellow G member.

the car still freaking vibrates! wtf ! its def not the wheels.

i will go for an alignment on tuesday.

how could a bad alignment cause the front passenger wheel to vibrate? at 80 mph and over. no vibration under 80mph..
seems like i am not the only one with the fronts vibrating.

other then alignment, what else could be it..

brakes and rotors changed. tried different wheels. still vibrates.

still curious how spring would cause the front end to vibrate.

 

Wow--that's a weird one.....sorry man....I woulda bet the house it was because of the wheels/tires....I have no answers anymore.....

 

Wow that is strange. As I read this and came up with ideas they were all asked.

Do you feel it in the wheel or in your butt? Wheel = front problem and butt = rear problem. No pun intended.

 

I had this same problem with my G! Turned out that my tie rod end had to be replaced. Try jacking up your front and grab your rims and try to manually turn them not spin. They shouldn't move at all but if does there is your problem. I hope that helps.......................... oh and my car also vibrated on the right side but the left side tie rod was bad.

 

when your car is being alinged it SITS on the tires so the shop cannot find the play in your tie rods......

 

tie rod? i will check that tomarrow when i install my VRT bar.

any after market tie rod? or OEM stealer part only?

thanx for the quick replys guys. keep on rocking ...

 

I could only find the stealerships part......... let me know if I was helpful

 

just an update, the alignment with inner & outer tie rods fixed the vibrating.
finally!
now i can drive fast again wooOOOt woOoOot

 

I'll have to try that too cuz my sedan does the same thing just at 70mph and up.

 

an alignment should fix it right up.

 

Where did you get it aligned, dealer or specialty shop? Specs available? I had similar noise, and the dealer couldnt duplicate the noise. Tech drove with me, and even though I pointed the noise out, he said that he couldnt hear it.

I'll have to check the tie rod that was mentioned as well. What's inner and outer tie rods got to do with alignment? Is that something extra, or a normal job with an alignment that I should mention?

 

went to FIRESTONE for alignment. you have to use COUPE specs for front camber adjustments.
worn tierods will make your car pull to side or vibrate. when the car is on the lift the mechanic can check if you need tierods.
the tierods need an alignment after install. so do those before alignment.