Jaguar Forums - Jaguar Enthusiasts Forum - XK8 / XKR ( X100 ) https://www.jaguarforums.com/forum/ 1996 - 2006 en Fri, 22 May 2026 21:30:09 GMT vBulletin 60 https://www.jaguarforums.com/forum/images/kirsch/misc/rss.jpg Jaguar Forums - Jaguar Enthusiasts Forum - XK8 / XKR ( X100 ) https://www.jaguarforums.com/forum/ Failsafe Engine mode https://www.jaguarforums.com/forum/xk8-xkr-x100-17/failsafe-engine-mode-296586/ Fri, 22 May 2026 09:37:54 GMT My 1999 XKR is coming up Failsafe Engine mode and then restricted performance. The car is running fine, there certainly isn't any restricted performance. I have looked for codes on my ODBII reader but there aren't any shown. Any ideas please?
Many thanks Gerard. ]]> XK8 / XKR ( X100 ) Gerard https://www.jaguarforums.com/forum/xk8-xkr-x100-17/failsafe-engine-mode-296586/ Rock Auto closing out Autolite plugs (MAY 26) https://www.jaguarforums.com/forum/xk8-xkr-x100-17/rock-auto-closing-out-autolite-plugs-may-26-a-296584/ Fri, 22 May 2026 01:15:14 GMT Dunno how long they will have them, but Rock Auto has Autolite plugs on "Warehouse Closeout" at good prices (just ordered 8 Iridium XP3924 at $3.06 each, under $40 including tax/ship). ]]> XK8 / XKR ( X100 ) Sone https://www.jaguarforums.com/forum/xk8-xkr-x100-17/rock-auto-closing-out-autolite-plugs-may-26-a-296584/ 2003 Jaguar XK8 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/2003-jaguar-xk8-296578/ Thu, 21 May 2026 15:29:37 GMT Hello everyone, i have a 2003 Jaguar XK8 4.2 liter and i am changing the timing chain. i noticed when putting it back together the left side of the VVT i am able to retard the intake side. i am... Hello everyone, i have a 2003 Jaguar XK8 4.2 liter and i am changing the timing chain. i noticed when putting it back together the left side of the VVT i am able to retard the intake side. i am unable to retard the right side intake, i did nothing different from the left side. i dont have the crankshaft chain connected and i am leaving the exhaust side a little loose and the intake about 20 foot pounds of torque to hold the bolt until i retard the vvt. My question is, do i need to retard the right side or is it just the left side that gets the retard? Thank you to everyone in advance for all your help. ]]> XK8 / XKR ( X100 ) danielamanda1 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/2003-jaguar-xk8-296578/ CD Player Not Working? https://www.jaguarforums.com/forum/xk8-xkr-x100-17/cd-player-not-working-296569/ Thu, 21 May 2026 00:46:07 GMT For a few years my CD player would work for a while, then stop. I'd try cleaning it and the cassette after which it would work for a few days and then fail. Finally assuming I had nothing to lose, I decided to spray the hell out of its with WD40 while it was turned off. I stuck the nozzle into the loading slot and sprayed all around the inside for several seconds. I let it dry for a while, then reinserted the cassette. That was over a year ago and it has continued to work flawlessly since then, playing six CDs in rotation. And all the function buttons work. WD40 is harmless to electronics, so I don't think it can really do any damage. Hope this helps some members who have experienced the same problem.
]]> XK8 / XKR ( X100 ) Stamford https://www.jaguarforums.com/forum/xk8-xkr-x100-17/cd-player-not-working-296569/ Oil Drain Plug Gasket https://www.jaguarforums.com/forum/xk8-xkr-x100-17/oil-drain-plug-gasket-296558/ Wed, 20 May 2026 01:38:37 GMT Read somewhere that you should replace the oil drain plug gasket at every oil change. Bought a supply for future use and read the package which states: “Change gasket every oil change”. “Do not use... Read somewhere that you should replace the oil drain plug gasket at every oil change. Bought a supply for future use and read the package which states: “Change gasket every oil change”. “Do not use unless oil pan threads are stripped”. ??? I am confused. ]]> XK8 / XKR ( X100 ) Rex https://www.jaguarforums.com/forum/xk8-xkr-x100-17/oil-drain-plug-gasket-296558/ Cam tensioner bolts https://www.jaguarforums.com/forum/xk8-xkr-x100-17/cam-tensioner-bolts-296556/ Tue, 19 May 2026 23:22:03 GMT What are the size and length of the upper cam tensioner bolts?

I see lots of references to shorter bolts, but haven't found someone just saying what bolts they are. ]]> XK8 / XKR ( X100 ) Sone https://www.jaguarforums.com/forum/xk8-xkr-x100-17/cam-tensioner-bolts-296556/ Noise in my trunk/boot https://www.jaguarforums.com/forum/xk8-xkr-x100-17/noise-my-trunk-boot-296548/ Tue, 19 May 2026 16:12:18 GMT I recently replaced all four of my shocks including the insulators and upper shock mounts. I also replaced my front upper wishbone bushings, upper ball joints, sway bar end links and sway bar... I recently replaced all four of my shocks including the insulators and upper shock mounts. I also replaced my front upper wishbone bushings, upper ball joints, sway bar end links and sway bar bushings. I have new tires and a fresh alignment. Now I hear a noise that sounds like something bouncing around in my trunk/boot, but there is nothing loose back there. I suspect something in the suspension. I’m open to suggestions. Thank you. 1997 XK8 convertible, LHD, non supercharged. ]]> XK8 / XKR ( X100 ) drk1074 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/noise-my-trunk-boot-296548/ Start Diagnosis Help - I shorted something https://www.jaguarforums.com/forum/xk8-xkr-x100-17/start-diagnosis-help-i-shorted-something-296539/ Tue, 19 May 2026 02:32:56 GMT Hi all,

1999 XK8 4.0. I made a mistake during AC diagnostics — grounded Pin 1 of the AC compressor clutch relay socket with the engine running. Engine shut off immediately and won't restart.

What happened:
  • Engine Compartment Passenger Side Fuse 14 (10A) was blown — covers ignition coils relay, throttle motor relay, AC compressor clutch relay, HO2S heaters, EGR and EVAP
  • All other fuses good
  • Fuel pressure confirmed present
  • No spark — confirmed by pulling coil pack
What I've ruled out:
  • Fuel system — pressure confirmed
  • All fuses — checked with ohm meter
Interesting observations:
  • Ignition coil relay receiving correct signals from ECM but not switching — tried 3 relays
  • "Stability Control" warning on dash — new since the incident
Could the ABS/TCCM be sending a false fuel cut-off or ignition retard via CAN bus? Could the ECM be damaged? Could it be the immobilizer? Has anyone seen this before?

Any help appreciated — keen to sort this myself before going to a specialist.

Thanks

]]> XK8 / XKR ( X100 ) scottatl https://www.jaguarforums.com/forum/xk8-xkr-x100-17/start-diagnosis-help-i-shorted-something-296539/ Door keys https://www.jaguarforums.com/forum/xk8-xkr-x100-17/door-keys-296511/ Sun, 17 May 2026 19:46:22 GMT Does the door and trunk use a different key than the round ignition key? I only got the one key and what looks like a universal remote with my new to me 2001. Does the door and trunk use a different key than the round ignition key? I only got the one key and what looks like a universal remote with my new to me 2001.
]]> XK8 / XKR ( X100 ) bturner425 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/door-keys-296511/ 1999 XKR Heater Not Working https://www.jaguarforums.com/forum/xk8-xkr-x100-17/1999-xkr-heater-not-working-296504/ Sun, 17 May 2026 13:03:47 GMT Hello my 1999 XKR heater won't work.i have changed the heater pump but still no heat, has anyone had this or knows how to fix it?
Many thanks, Gerard.
]]> XK8 / XKR ( X100 ) Gerard https://www.jaguarforums.com/forum/xk8-xkr-x100-17/1999-xkr-heater-not-working-296504/ We all can use the Electrical Guide now!!! https://www.jaguarforums.com/forum/xk8-xkr-x100-17/we-all-can-use-electrical-guide-now-296498/ Sun, 17 May 2026 01:28:48 GMT I have always had trouble using the electrical guide. It is to technical for me. I loaded it, and the workshop manual into Claude and it is able to have a dialog regarding my issue. I am working... I have always had trouble using the electrical guide. It is to technical for me. I loaded it, and the workshop manual into Claude and it is able to have a dialog regarding my issue. I am working on the A/C. I may start another post about that adventure but that is not the point of this post. It is just amazing what the tool will do and for free for now.

It can understand the circuits, the wire colors, give me suggestions on how to test my issue. Just blows my mind, and I am in the technology field.... ]]> XK8 / XKR ( X100 ) scottatl https://www.jaguarforums.com/forum/xk8-xkr-x100-17/we-all-can-use-electrical-guide-now-296498/ Ads covering the bottom of my PC screen https://www.jaguarforums.com/forum/xk8-xkr-x100-17/ads-covering-bottom-my-pc-screen-296494/ Sat, 16 May 2026 19:11:09 GMT Anyone else having this issue? Ads keep coming up across the bottom of my screen on this forum and they block me at times from doing a reply to a thread. Google Chrome is what I am using. Thanks Anyone else having this issue? Ads keep coming up across the bottom of my screen on this forum and they block me at times from doing a reply to a thread.
Google Chrome is what I am using.
Thanks ]]> XK8 / XKR ( X100 ) Pantera928 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/ads-covering-bottom-my-pc-screen-296494/ Problems with gearbox shifting! https://www.jaguarforums.com/forum/xk8-xkr-x100-17/problems-gearbox-shifting-296484/ Sat, 16 May 2026 07:55:14 GMT Hello Everybody This morning, on my 2002 XKR 100th Anniversary, returning from a short drive, while going down the ramp to my garage, I heard a strange noise. Then the gearbox jerked when shifting... Hello Everybody This morning, on my 2002 XKR 100th Anniversary, returning from a short drive, while going down the ramp to my garage, I heard a strange noise. Then the gearbox jerked when shifting from forward to reverse. At the same time, the indicator lights on the gear selector stopped illuminating, and the power steering became stiff. The dashboard displayed a yellow warning light and the message "Gearbox Fault." I turned the ignition off and then back on. The message disappeared, the gear indicator lights were working, and both forward and reverse gears were working fine. The steering was also lighter. Does anyone know what could be causing this? Thanks for the advises.
]]> XK8 / XKR ( X100 ) Marignan75 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/problems-gearbox-shifting-296484/ P0706 code but very intermittent https://www.jaguarforums.com/forum/xk8-xkr-x100-17/p0706-code-but-very-intermittent-296481/ Fri, 15 May 2026 22:26:39 GMT Hi all! A weird but seemingly known issue popped up on my 1996 XK8 Coupe: The issue happens almost only when turning on the ignition (not starting the car) on a cold engine (even if hot outside).... Hi all!
A weird but seemingly known issue popped up on my 1996 XK8 Coupe:
The issue happens almost only when turning on the ignition (not starting the car) on a cold engine (even if hot outside).
After letting the car idling for 1 minute, cutting the ignition, and putting it on the ignition key position, the gearbox fault disappears.
It rarely happens when driving, it is possible but very unlikely. Once the engine is hot, the fault is very unlikely to reappear when turning the key to ignition.
I charged the battery and since the fault appears before cranking, I think the voltage is not the issue here.
I have tried moving and jiggling the J-Gate but it seems to work perfectly and I cannot reproduce the issue once the car is running with the fault cleared.

Could it be a bad connector inside the rotary switch, which actually connects when the temperature rises?
I have seen several DIY possible repairs for the switch, or people that can refurbish them, but I would like to be sure that the problem comes from it, and I don't know how to check that properly... ]]> XK8 / XKR ( X100 ) MartyMcCool https://www.jaguarforums.com/forum/xk8-xkr-x100-17/p0706-code-but-very-intermittent-296481/ Incredible XK8 XKR Video! https://www.jaguarforums.com/forum/xk8-xkr-x100-17/incredible-xk8-xkr-video-296477/ Fri, 15 May 2026 16:32:27 GMT Some videos just make you want to go outside and go for a drive!! THINGS TO KNOW - Before buying a Jaguar XK8 XKR X100 https://youtu.be/rcMp4Bx61Q4 Some videos just make you want to go outside and go for a drive!!

THINGS TO KNOW - Before buying a Jaguar XK8 XKR X100

]]> XK8 / XKR ( X100 ) hm1 https://www.jaguarforums.com/forum/xk8-xkr-x100-17/incredible-xk8-xkr-video-296477/