Jaguar XJ8 3.2 WhatTheFuckIsThatNoise Edition Update
So wafty goodness has returned all weekend, with only the fucking irritating metal-on-metal rattle that's plagued me almost since I got it. I had isolated it as far as "somewhere in the centre console" and the only thing for it was to hoik the whole thing out.
Actually much simpler than it appeared, thankfully.
So I guess one of the previous owners was a smoker then

I also found a small family polaroid, but no further ID/random watches or sanitary products.
Anyway. With the console out I could easily reproduce the clicking sound by manipulating the dashboard chassis, and it sounded very much like it was coming from the lower left corner somewhere.
Just out of shot to the left, just below the carpet line are two big TORX bolts that join the two main metal dashboard structures together, one either side. One of them is a sliding bolt. I loosened them both off a bit, gave the wole thing a bit of a tug in various directions, then did them back up..
...no more rattle!! Holy shit the relief was huge. 15 mins of re-assembly later and I did a 20 mile run around some crappy roads, and the wafty silence was deafening* I reckon it was just under tension somewhere and needed the wiggle to clear the two bits that were tapping together.
Job done.
* well, apart from all the other worrying noises, obvs.
It's gone backto the garage this morning so they can go over the hub and re-check it's all still torqued up correctly etc, and to pull the diagnostic codes so they can see why it's stuck in Open Loop fuelling. 50p says that'll be the O2 sensor I've been telling them about for 4 months.
You settle up, I'll go get the Jag.