hi there, my xjr has a veryy rough drive between 55 all the way till top speed, i cannot seem to find where the problem is, the cat has covered 105k miles, is there any common fault on these? the driver seat will vibrate like mad at speeds, rear drive shafts and uj's are all ok, the prop shaft at high speed i cannot see a single viabration, i did buy a secondhand one and fitted it!

 

Hi it sounds like a wheel imbalance, have you changed tyres recently, did the vibration come with the prop, or did it exist before, and you changed props to see if it cured it?

 

Hi there,
Try to change the anti-rollbar bushes, front, and rear if it's XJR. 20 pounds and one hour job.
If no improvement, try more difficult jobs like wheel bearings and wishbone bushes.

 

definately not wheel imbalancing, anti roll bar bushes im considering but thiinking that wont cause viabration.
ok, the disc on this model is expencive £250 a pair (brembo) so i had them skimmed professionally due to warping, would that take the imbalance out?

i can put the car on the ramp take it to 80mph with traction off and feel the boddy viabrate mad! :S where shal i have a look?

 

I bought mine 1 year ago for Manchester, and I had to drive home with 70 mph for 2000 miles because of that symptom(60 kmiles). It was such a pity to drive in Germany with this speed because of that vibration.
2 weeks later I changed the front anti-roll bar bushes on front and it disappeared. Now I changed the upper wishbone bushes, and their rubber is half broken.