I'd agree with the tyre diagnosis but also under such extreme acceleration it's possible the rear suspension bushes might be deforming. They might be ok for MOT but not up to the job you're asking. If tyres doesn't solve it then look into Polybushing the rear suspension. Should cost about £1000.

The XJ experience Finishing work after midnight, Ever chasing the dying of the light, Tense and tired from sleep in the lack, And on top of that an aching back. Now the time is to depart, The eye falls upon a work of art, The lines, the sweep, the stance, Joins the eye in inspiring dance. And now to...

I phoned the Jaguar main dealer and they won't treat it under warranty. It only lasts 3 years and they say there's no recalls. Talking on the Jaguar forum a few guys have solved their rattle problems by silicone greasing the rubbers and runners, I had some silicone spray so I've tried that. I'll wai...

I've got a rattle in my sunroof. It's like a knocking rather than a rattle, it's most pronounced at low speed over slightly rough roads, never at speed. It's kind of intermittent in as much as it's worse at times than others. I've been told that the headlining will have to be dropped and that's a da...

Hi. I'm new to the JEF. I own an X351 XJ 3.0ltr supercharged portfolio which looks identical to the one pictured in the X351 section of the Jaguar Enthusiast magazine top right.
Craig Thompson is asking for people to write in about their experiences with the XJ.
Anyone know how I'd go about that?