I have an 1989 XJS V12 that I have been updating, the car is orginal and mechanic's have said in very good condition and care. My last bug to find is: When I take out for drive on interstate 40 miles round trip, when I stop at a store the car is hard to start, won't stay started, rpm hard to keep up to 600 without stalling. I have had the fuel filter and fuel pump replaced and have returned twice. Couldn't find problem. Sounded like a pinched or restricted vent hose. No find. This last time I drove out about 20 miles on the interstate, stopped for 20 minutes and bank on the interstate the car shut down. I opened gas cap and tried to start, I waited about 20 minutes and the car starts right up and drives like normal. when it does it thats what I have to do wait 20min and start. Any idea's?
Submitted by jfwwrepair@att.net on Wed, 04/22/2015 - 14:20
Todd
I had this same problem last year as well. There are 2 crankshaft sensors on the 5.3 liter (part #DBC12507, replaces part #DAC4606 per Engel Imports). One of them mounts on the bell housing right next to the exhaust pipe. The heat generated from a longer,drive shorts out the sensor. Mine also had a very small heat shield missing. Designed I'm sure to minimalize this problem. I replaced this sensor, fabricated and installed a new heat shield. No problems since. The part was $55.00. The installatioin is easy if you can get under the car. Hope this helps.
Jeff Ford, 91 XJS convt.