Highway vibration is driving me nuts!

J

John Murphy

Member
Car
2015 Infiniti Qx70 AWD
Name
John
Hey guys, My 2012 Infiniti fx35 AWD has been vibrating on the highway between 60-80mph for the last 2 years and it's driving me absolutely nuts. Both the steering wheel and the cabin vibrate, not just the steering wheel.
I tried the following but none of them worked:
I had 3 tire shops check my wheels and none of them are bent
New tires and had them force road balanced 2 times
New front wheel bearings
New front strut assemblies
New brakes and rotors
New NGK spark plugs
New valve cover gaskets
I rotated the tires twice but that made no difference whatsoever
If I take my foot off the gas, the shake is still there, so I think that this eliminates the driveshaft
Has anyone had this issue and managed to fix it? I'm really considering selling the car because nothing seems to work. I did see the steering rack bolt posts but they appear to be for the 1st gen FX body and not the 2nd gen as I haven't seen anyone talking about it for the 2nd gen FXs.
If anyone has any helpful information please let me know as it's driving me crazy.
Thanks in advance.
 
Motor Mounts and Transmission mount OK? Only cuz you didnt mention
 
You mention new brakes and rotors, does new brakes mean calipers or just pads, I had a vibration around that speed and change out my calipers because the sliders were stuck and rust around the piston making the brakes hang and it solved the problem, drive axels if you hear a clicking when you turn a corner they're shot, i'm about to change those on mine.
 
On first gen, rear drive axle clicking on slow turn is axle grease needed only. There is a TSB. Cant say for 2G, but it's worth a look. Maybe someone here knows
 
M
John Murphy said:
Hey guys, My 2012 Infiniti fx35 AWD has been vibrating on the highway between 60-80mph for the last 2 years and it's driving me absolutely nuts. Both the steering wheel and the cabin vibrate, not just the steering wheel.
I tried the following but none of them worked:
I had 3 tire shops check my wheels and none of them are bent
New tires and had them force road balanced 2 times
New front wheel bearings
New front strut assemblies
New brakes and rotors
New NGK spark plugs
New valve cover gaskets
I rotated the tires twice but that made no difference whatsoever
If I take my foot off the gas, the shake is still there, so I think that this eliminates the driveshaft
Has anyone had this issue and managed to fix it? I'm really considering selling the car because nothing seems to work. I did see the steering rack bolt posts but they appear to be for the 1st gen FX body and not the 2nd gen as I haven't seen anyone talking about it for the 2nd gen FXs.
If anyone has any helpful information please let me know as it's driving me crazy.
Thanks in advance.
Click to expand...

I have same problem, harsh vibration and shaking starts at 5mph, after mutiple trial and error, the dealership found that it was my steering rack n pinion that needed adjustment.. After it was adjusted most vibration gone, but theres still a slight vibration above 80mph... Was recommended to replace the rack.by local dealer.

May be this can help
 
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