The other thing is to use the best sort of spanner you can get over the nut in the space available. With clearance to the top, a hardened impact wrench socket will be best, but of course you won't get one in there. Flat ring spanners or flat ratchet spanners are far better than anything open-ended, ...

The front aerodynamics stuff was to prevent lifting at speed. Possibly only extreme speed - after all, a old V12 can do over 140 mph if you have the nerve (see a certain Top Gear episode) - but possibly dangerously light steering at 70 or so.

Mike, I suspect that foam core varied with model - I'm pretty sure my Series III has no foam except at the corners, ditto my facelift XJS. <edit>Sorry, missed that you were talking about the coupé. If you have old door seals that no longer work and have no foam in them, a trick shown on Wheeler Deal...

Another possibility related to BrianG's suggestions - damaged wiring or loose connectors in the ride height circuitry, It seems to sometimes be getting the signal for too low (causing the message) and possibly sometimes too high (causing it to deflate the system to try to reduce the height). Note th...

FWIW I read somewhere on the web that second-hand I-Pace motor units are pretty cheap.

FWIW, some years ago my insurer wanted to see the Thatcham certification note from the installer, and so I had to take my car to a professional to check the immobiliser installation and issue the cert. The immobiliser came with the car when I bought it second hand years previously.

As an alternative to greased cardboard, an old glossy magazine opened out - the shiny pages make a good bearing.
'Course in these days nobody reads glossy magazines, so perhaps a stack of old phones or tablets

I wonder if it could be a failed wheel bearing, which might also explain the clicking. It's easy enough to test - jack each front wheel off the ground and give it a spin. If it won't spin, it's binding brakes; if it spins and makes a noise, it's probably bearings; if it spins freely and there's no n...

I am confused. I know about XJ 6 Series 2 and Series 3, but not XJ S . There are several XJS designations - HE, and Facelift being the two most common, but XJS's are usually distinguished by VIN, 'cos it's really messy. (I see classic.com using Series II to mean HE, but then I see automobile-catalog...

AFAIR it's not a DIN size, since that standard was only introduced in 1984. It's the previous size where the radio is held by the two control knobs, and it's a slightly larger slot ( a matter of a few millimetres) than DIN-1. When I replaced my XJS radio with a DIN one, it either came with, or I bou...

What sort of V12? The EFI versions shouldn't produce carbon unless they've leaks (broken piston rings, failed valve stem oil seals, holed pistons) taking oil into the engine. If it's carburetted, then a bad attack of mistuning is possible, but I'd still suspect some sort of oil leak to produce enoug...

I don't believe there to be much in the way of 'parasitic drain' on these cars...

Ah, but if you have an aftermarket immobilizer, that can flatten a battery in a couple of weeks, particularly if it has ultrasonic intrusion detection. You can guess how I know.

... I would have expected the cracks to close as the manifolds got hot and the metal expanded, rather than them open ... Think of a sheet of say rubber with a hole in it. Stretch the sheet; the holes get bigger. Another way to view it: fill the crack with a fillet of cast iron that fits without for...

Assuming these have halogen bulbs, are they cloudy due to steam inside or due to surface damage outside. I found steaming up can be cured by taking out the bulb and leaving the access panel open for a day or two in dry weather when the car is not being used. Then take great care that the panel seats...

Remember that the V12 takes a lot of starting. Mine is an early facelift with the older small battery box, and I suspect the battery fitted is barely up to the job. Later cars got a battery box about the same size as my XJ TDVi, a pukka diesel, and a much larger battery. So I'd guess you need a powe...