The upper bushings on the front shock absorbers are prone to failure and may produce a rattling/jingling noise as the car is driven over bumps.Google+
Car Problem Reports
Jaguar XJ6 Rattling Noise Due to Failed Upper Front Shock Bushings
Jaguar XJ6 Problem
Average Mileage: 116,166 mi (69,000 mi - 175,000 mi)
Replaced the front shocks myself with some KYB's and problem gone. You can see it also if you just jack the car in front and look, shock itself (in my case) was bad where once raised the shock did not compensate and was away from the body at top. It should have expanded to fill the gap from jacking the car. This is evident after putting in new shocks.
Visitor, 1994 Jaguar XJ6, 170,000 mi
I had that problem with the shock bushings too, I just added an extra washer Glued to the original ,
J B weld can also do the trick.
Visitor, 1995 Jaguar XJ6, 108,000 mi
car sat 3 years, purchased and tuned it, front passenger wheel area rattle, replaced bushings both sides front, had sat too long and degraded
loud noise when going over a bump
Visitor, 1996 Jaguar XJ6, 85,000 mi
Right front rattles when I go over bumps
Visitor, 1996 Jaguar XJ6, 155,000 mi
1996 Jaguar XJ6
Rattling when car goes over bumps.
Visitor, 1990 Jaguar XJ6, 175,000 mi
car runs smooth. when going over a uneven road pattern front driver side can feel and hear hit noise of a shock.
Visitor, 1995 Jaguar XJ6, 150,000 mi
rattle noise from front passenger side when going over bumps
Visitor, 1994 Jaguar XJ6
Rattling noise when going over bumps