Has anyone had a problem with Jag stalling or dying in extrmemely cold weather....what could cause this problem....oil pressure reads high...but water temperature remains cold...starts fine, but stalls and dies out after 10-15 minutes of driving...low to no compression. Please advise on what could cause this problem or how to correct this.

Submitted by SE21-33540J on Sun, 12/11/2005 - 23:02

Doug,

Sorry to take so long to reply, I was out of town.I had the same problem with a V12 sedan I owned and the relay was located with others on a mounting bar in the front attached to the brace behind the radiator. I believe that they are located on the firewall at the back of the engine bay on a XJS. I am just guessing right now as my current XJS is a 6 cylinder and they are located on the driverside fender well. As you can tell I am not as good at this as many of are members are. All I know is I called the parts guy at my Jag dealer and he suggested I replace this relay...and it fixed the problem. He had the part in stock. Another possibility is a bad Coolant temp sensor. This reads the coolant temp and sends messages back to the ECU through the relay I spoke about. I know this all is probably of no help, but there you have it.
Jerry
1986 XJ-SC 3.6 / 5 Speed
2000 S-type 3.0

Submitted by SE21-33540J on Fri, 12/09/2005 - 09:10

There may be no connection to the change to cold weather it could just be a bad cold start module. Mine went out on in summer.This module if bad, will tell the computer that the engine is still cold and thus keep a rich mixture feed to the engine and thus the stall. Once it sits for a few minutes it starts and then the same thing happens again. This is an easy fix at about $25.oo for the module,snap out old, snap in new. I would do this before I replaced anything else.

Jerry
1986 XJ-SC 3.6 / 5 Speed
2000 S-type 3.0

Submitted by neffd@dteenergy.com on Fri, 12/09/2005 - 07:34

Check both of your Thermostats. They may be stuck open or perhaps not even there at all. Either of those situations would result in a very rich fuel mixture. The excess fuel may be washing the oil off the rings and cylinder walls creating low compression.

Don Neff
1991 XJ-S V12 Convertible 5-Speed