Your description of the cold start device suggests that the inlet manifold and carburettors are from a Mk X or 420G which are a straightforward swap to the 4.2 XJ engine. As for the rear brakes, Jaguar issued brake ducting diagrams in a booklet entitled "Tuning and preparation of E Type cars for Com...

Welcome.
Good choice; they go like the clappers, and not much goes wrong.

The valve timing, clearances, ignition timing, mixtures, or a combination thereof must be incorrect if the acceleration is sluggish and accompanied by backfiring.
Look for air leaks / vacuum pipes disconnected to start with; the cheapest and easiest thing to fix.

Thanks Paul for your reply. I can use it OK, except that I cannot see how to cancel route or choose whether to take fastest/shortest route etc. Chris Go to: Nav menu, To cancel guidance: Route options, Cancel guidance, Yes. Shortest / fastest route is also in route options afair, if not, look in ma...

I am pleased that the couple won; a great shame about Suffolk.
Jaguar has become small minded and petty. Having owned 25 Jags, I am unlikely to buy another.

The following should give you all the information that you could possibly need: https://www.jaguarforums.com/forum/xj-xj6-xj8-xjr-x350-x358-28/what-normal-ride-height-178076/ https://www.jaguarforums.com/forum/xj-xj6-xj8-xjr-x350-x358-28/air-suspension-ecats-system-summary-components-operation-17481...

Worth noting is that the serrations mentioned by piman above are of a vernier pattern, so if the holes do not align perfectly turn the plate through approximately 180 degrees.

A difference of one degree in timing would be unnoticeable. The problem of setting the idle and the backfiring are most likely to be caused by an intake air leak. If nothing is obviously disconnected / missing / perished, take a look at the brake vacuum reservoir for leaks caused by corrosion.

Powerhouse Automotive https://powerhouse.uk/jaguar-supercharger-4-0-and-4-2-v8-upper-pulleys/ fitted my 10% pulley with the supercharger in position about six years ago. The snout had to be machined down for clearance, but they have an in house designed and built tool to do this. For what they charg...

If one takes the diesels out of the equation, and remembers that these are old steel bodied cars needing renewal of their rust protection every few years, what is there to talk about? All the petrol engines are pretty well bulletproof (surviving 4.0s by now must have have the timing chain tensioners...

I intensely dislike chemical solutions to mechanical problems, however, I would be inclined to instal K-seal in this case. Developed to cope with the design deficiencies of the Rover K series engine and cooling system, and really does a permanent job, contiuing to work even after subsequent coolant ...

Probably someone who couldn't afford £740,000 for Diana's Ford Escort.

Which pales into insignificance when compared to the £12,000.000 which Andrew's Escort cost him.

What kind of idiot pays that much for an X-type, regardless of which dead person's backside has been in the driver's seat?
A fool and their money....

I run my modified X358 XJR almost exclusively on Esso 99, as it is mapped to expoit the higher octane. It's a happy coincidence that in my area it is also ethanol free, the double bonus is that our local station sells it for less than Tesco ask for their cooking stuff. My wife's XFR runs perfectly h...

Sounds like you did well DaveO! Apart from the financial hit and the stress, overall it will have done you good. I remember Osselli. I think my older Brother was lusting after some of your conversion parts back in the 70's Andrew You're right Andrew, I am a very careful driver now. Its extraordinar...