ii can really here it in the interior and through the tires and everything when im coasting it smooths out at higher speeds and higher rpms. this thing was perfectly fine and i havent hit anything.. any ideas? i have 20" iforged wheels, could it be a rear or front sway?

 

Most often a vibration at a certain speed only is a tire out of balance.

How long has it been since you've had your wheels balanced? It's possible a wheel weight fell off...esp if you have the stick on type

 

Definitely get your wheels checked out; have a reputable wheel shop check out the balance.

 

it just recently started, (past couple of days) it seems to come and go. i checked the air pressure and on one tire it was high so i thought this was the cure. it drove smooth for about 5 minutes then when i got to the open road it kicked in again. ill get off one exit and its pretty smooth, then go on another and it vibrates evey piece of plastic in the car. i did have one of the valve stems on my rims checked at a tire shop for a slow leak last week. is it possibly they f'ed up a weight or did smething wrong?

 

Wheel bearing / Tire Non Rotated / Abnormal Tire Use / Mis-Alignement. All i have in mind

 

check to make sure those hub shims are in place! may not be your wheels, tranny maybe?

 

UPDATE! im going to update and i wish everybody would do this in theyre threads. i took my car to an allignment place here in town and they confirmed one of the brake calipers was locking up. this explains why the vib comes and goes. anyway they suggested i replace calipers on both sides for even braking which i did. $550 the problem is solved.

 

That makes no sense.

 

It fixed the problem. So it must make some since.

 

A sticking caliper won't specifiaclly cause wobble. Rather it will cause the car to veer to one side, as though your tracking is out. You'd also smell it, as the pads would be burning. Have you definitely got new calipers on there? You sure they didn't just balance you wheels, and flog you some calipers at the same time?

 

That's why i said it doesn't sound right. A sticking caliper would cause a car to veer to the side and would be constant. It wouldn't pulsate and disappear at speed like that. It would smell like burning brake as well.

I would be wondering if they just balanced a tire for you and then sold you $550 of stuff you didn't need to make a few bucks

Are your calipers new? Can you see that they changed them?

 

The caliper was replaced and It was bad. I remember after only a 5 minute drive pulling over and rinsing the car off and that caliper was sizzling and steam came out. The others were fine. Also the brake wasnt fully pressed or Anything. Just hit It enough to cause the car to vibrate he said the rotors are a bit warped and that cause the vibe. I'm doing my own brake pads and rotors though. Hopefully project mu and new rotors of some kind. The project mu are on backorder everywhere.

 

Well i can see a sticking caliper on a warped rotor vibration