My '08 XJ8 vibrates at speed. The vibration is most pronounced at 40 mph and above 70 mph but is present at other speeds as well. Balancing and alignment check out. The car tracks straight and true, does not pull to one side. Any thoughts on what might be the cause?

 

A propshaft bearing or coupling maybe ? The flexibles are known failure items.

 

Thanks for the suggestion. Will check them.

 

Could also be warped rotors. Warped rotors don't necessarily pull when applying brakes, more of a slow bounce or grab and release. But you would feel that in the pedal and in your seat. Vibrations felt at the steering wheel can also be worn out front hubs, failing air springs, motor mounts or a damaged caliper.

 

Is the vibration in the steering wheel or in the seat? If the wheel is generally front end, if seat then rear end/driveline. Does it vibrate when braking or just when driving along?

 

Bill It is all here thanks to Don:

https://www.jaguarforums.com/forum/x...ration-215663/

Not an x350 but very similar

 

Vibration is in the seat when driving. Thanks for the suggestions.

 

I have been trying to source if there's a problem with my bearings . The rear wheels got a slight temperature near the center , more than handwarm (driving constantly 100km/h outside temp freezing) snd felt something is not right. Had no vibration though . I decided to make my mecanic change the bearings and the brakepads all round . He found one guiding pin on the caliper stuck on both sides at the rear.
causing the pads to not being in correct position warming up the brakediscs and the wheel center area
I HAD STUCK GUIDING PINS ALREADY ON THE FRONT 2 YEARS AGO