BTW, this is not a battery or a starter problem, as the engine does cranks beautiful. This afternoon I was taking my 1994 XJS, 4.0L straight six to the smog check shop. After driving about three blocks I realized that I forgot to bring along the registration paperwork. I made a U turn and drove back home. I parked the car on the driveway and left it running for about a couple of minutes to go get the paperwork. Up to this point there was absolutely nothing wrong or strange with the way the engine runs. After two minutes I came out of the front door and realized that the engine had stopped running, although the ignition was still ON. Turned the ignition OFF and then I tried to start the engine again. Well, it did crank but it wouldn’t start. I tried it many times, but it just wouldn’t start. I tried to start it again some three hours later with a cooler engine, but the car just simply will not start. I have no idea why the engine stopped by itself when I left it running. I have no idea what may have happened with the engine. NOTE: Before I came back to the house for the paperwork, I did stop somewhere else for a couple of minutes but the engine continued to run just fine with no problem. What has, then, gone wrong? This engine runs like a brand new XJS, sharp and powerful.
My head was not clear this afternoon. I’ll do some troubleshooting in the morning, but if somebody here has a good tip it will be much appreciated. I’ll post this on the XJ40 forum, as well.