BRGTom, Welcome to the club. Unfortunately, its quite hard to pinpoint why a cars EML has come on when the diagnostics machine comes up blank. What you could be experiencing, is wiring issues. If you can, check as much wiring in the engine bay as you can and look for damage. Worn HT leads can also lead to a misfire. If you still see nothing, a Jaguar specialist will probably be able to sort you out at a cost. I hope this helps you out. Adam.