1999 Jaguar XK8 Won't start, no diagnostics showing

Just to confirm the engine is cranking but not starting. It sounds like this is the case, so we need to find out the three basic things we need to check.

First is fuel pressure, then ignition, and finally compression. You need air as well, but we can get to that if these other three check out.

Here are some guides that will need in order to figure this out.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-test-engine-compression

Once we know these items we can go from there. However, we will want to pull a spark plug and hold it against the block and see if there is spark.

Lastly, is the theft light remaining on when you are trying to start the engine?

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run through all this info and let me know what you find.

Thanks