kcgeek

This sounds weird.

Whenever I am going 70+ mph this I hesitate to call it a rattle, the whole car vibrates ever 4 seconds or so.

It is a subtle thing cause if you have the windows down you barely notice it. It happens whether the car is in gear or not.

I had the alignment done about a month ago. I also got both front tires rebalanced it does not seem like a tire issue.

The only odd thing about the car ( purchase 45 days ago) is it has new runway all season radials on the front and Falken 452 summer tires on the back.

Anyone have a clue

Thanks in advance.

J

Markham

If it happened since you had the alignment done, there is likely cupping on the tires and the new alignment will cause this harmonic vibration on a cycle that is every few seconds. Sometimes you feel it in the seat of the pants like it is coming up from the floor.

Just my experience.

jedblanks

Have you tried turning off Traction control to see if the problem goes away?

Are the tires the stock staggered amount?

If the computer sees a mismatch in the stock rotations it will engage TCS.

kcgeek

Cupped tires? I guess I will check them then. I didnt notice any cupping when I had on a lift last weekend. I had the alignment done a week after I got it cause it was pulling to the left.

Tires are 245/17 fronts and 285/18 on the rear.

Thanks

Goody

Does it vibrate while the car is sitting still? Is it RPM related? Maybe the exhaust is droning???? Is the exhaust stock?

tstar

Try getting you tires balanced on a Hunter Road Force machine, that has helped alot of members get rid of it. It helped mine but I didn't totally get rid of it until I installed new rotors and cleaned my Hub faces really well...

HTH

dgrant3830

I also just noticed a cyclic virbration on my '07 about 70 mph as well which I suspected it was the tires needing re-balancing. As suggested above, I did find a place with a Hunter 9600 road force balancer. Problem solved for me.