Ok peeps,

Has anyone had the gremlins of Fail Safe with nothing wrong? I need to gain trust in my car again but I don't like getting stuck.
Originally I received the message and code told me speed control. I then took all of the wires off of the throttle and first contact cleaned them with electronic parts cleaner then when dry used dielectric grease.
That seemed to work just fine till I had to pick my son up from a friend late and car went into Fail safe mode. I was able to shut key, restart and it went away. A week later I was going out and right into Failsafe mode after a rain storm. It wouldn't limp it's way up my driveway with a small incline. 5 hours later it started and ran, (no codes on any of those fail safes) like nothing was wrong.
Someone who owned car before me had Jaguar change the one gremlin plug to throttle with mix matched copper/Tin connectors, to all copper. Continuity is perfect zero on multi meter and solder joints perfect.
I just want a car I can get into and drive without in the back of my head it will go limp. I need XK 8 Viagra!😜.
Any ideas on fixing this?
I feel like the Devil spirit of Lucas has followed me from my XK120, MK2 & E-Types here. But there is no Lucas G-d of darkness in this car!
Thanks
Jax
99 xk8 convertible

 

The first place I would look is Battery. Low voltage causes all sorts of gremlins. Next I would look at all the ground wires. Corrosion can float a ground and then the gremlins are back. Search in grounding problems. If it does it during a rain as you suggest it sounds like a ground failure or a short. Good Luck.

 

What are the codes you are getting?

 

Rick,

Those were all done. New battery and all grounds from motor to body checked for corrosion and continuity first thing.
Been working on Jaguars since 1965.
Not used to the newer things. But I am lost at the intermittent problem
Thanks
Jax

 

I have this same problem with my 99 xk8, I've replaced the battery and changed to all copper connections. Still get this error every once in a great while.

 

Thanks all for replies!
I sent the Throttle body to ASI and all of these problems have so far gone away. It's only been a week and 250 miles but these problems are now gone. Now I have a rick fuel bank issue.
Thanks
Jax