I've no doubt that there's a slightly worn or dry bush somewhere in the steering column but it doesn't bother me that much.
However, if you find an easy fix let me know!!
1996 XJS Celebration Conv. (shown on the JEC stand at NEC Nov 2015)
2001 XKR Convertible
1989 XJ-S V12 Coupe. 2006 XJ TDVi Sovereign. 1995 XJ6 3.2. 2013 XF 2.2d. 2009 X Type 2.0d Sovereign estate
I assume you say it's not pump-related 'cos it's there when the motor's not running (otherwise I'd suggest a low fluid level causing air in the system). Actually, it could still be air in the system, as turning the wheel pumps fluid (and air, if any) from the rack around the system.
If it is down to the column, it might be the knuckle joint; it suffers from a lot of exhaust pipe heat (particularly if the heat shield is missing). Mine seized solid, causing a "bump" on turning lock to lock, though no noise. It's an integral part of the lower steering shaft, and AFAIK it's no longer available. If it is the problem, you might find one in a breaker's yard, otherwise kit-car component suppliers sell knuckle joints that could be welded on as a replacement, provided you know a really good welder. (The thought of a bad weld breaking at speed ...)
Other possibilities include virtually every front suspension bush, as turning the wheel will cause small changes in position in most of them, starting obviously with track rod ends and anti-roll bar bushes.
1986 XJ6 Sovereign Series III
1991 XJS V12 "facelift"
2008 XJ TDVi
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