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the standard plugs can cope perfectly well, it's only had a set of cams LOL. I'd second Micks guess at a plug lead being at fault.
It may still be an injector, but some more detailed diagnostics needed. If they're scared to remove the inlet manifold, don't let them work on it again.
the symptoms you've described are not that of a dropped valve. sounds like they're just botched the timing (probably got the pin in the wrong place on the crank) and don't know how to fix it.
Sounds a lot like a relay not switching on an ECU function. Look for corrosion around the fuse box and on all the relay terminals. sometimes removing and re-fitting can be enough to change something so you know you're looking in the right place
the XJS is the first car I ever loved. This was my stepdads in 1981:
That cabriolet is stunning, I have so much want for on! My uncle bought one about 10 years ago when he retired, that turned out to be an ex press car (c-reg) but he didn't really get on with it sadly.
you would see more difference by fitting a decent bend and getting rid of that original one with the concertina section. There's no heat in that part of the engine bay
Revs kill rods. simple as that. Seen LOADS of meg engines with engine damage on stage 2 upgrades (300+bhp/lb/ft, injectors etc) and it's usually from the same place
pads are probably not moving freely in the caliper. Decent quality standard stuff is plenty good enough, even for an occasional track day if you keep everything in good condition
don't do it, it's a terrible idea, all you will achieve is holding heat in the manifold which ultimately will effect power in a negative way. Polished engine parts get so hot you can't go near them
Wasn't my observation initially actually, but yes it did it, and yet is was completely shot. had been rattling for 40k and replacement brought the power back.
Re: dmallett's titanium ph1
fully remove the butterfly, clean up the burrs on the inside of the housing with some fine emery paper, then put it back together. Don't forget a dab of threadlock on the screws