99 xk8 convertible Exceleration issue

Question edited for clarity, add maker and toss in some CAPS.
Question moved to model category.

99 XK8 Stereo Wiring Diagram

Jaguar Forums https://www.jaguarforums.com > xk8-xkr-x100-17

Nov 23, 2010 - I have seen multiple wiring diagrams throughout the site but none specifically for a 1999 XK8 Convertible Stereo with premium sound (Harmon ...

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1999 Jaguar XK8 Car Stereo Wire Colors and Locations

the12volt.com https://www.the12volt.com > installbay > stereodetail
1999 Jaguar XK8 Stereo Wiring ; Ground, Chassis ; Illumination, n/a ; Dimmer, n/a ; Front Speakers, 5 1/4" Doors.

The only place for routing would be on a dealer bulletin. You can get from www.alldata.com

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I'm having a similar issue to the one described in this post:

http://www.2carpros.com/questions/jaguar-xj8-1998-jaguar-xj8-car-turns-over-then-stalls

However, I can not find an inertia switch. I have a 1998 Jaguar XK8 convertible. Does being a convertible make a difference in this switch's location?
I removed the passenger kick panel and also checked in the fuse box door on the dash at the passenger side. Thank you.

It sounds like the catalytic converter might have come loose causing a loud exhaust leak. Did they repair the problem that caused the converter to plug up like a defective oxygen sensor or coil pack?

Catalytic convertors' been bad for ten years?!! They're probably plugged.

Having a restoration shop and running several newer Jaguars I have seen similar situations. Intermittent multiple errors such as these can be caused by a low battery (or corroded connections) that "fool the computers". Also had a '99 XJ8 VDP have exactly the same issues over several months. Issue was a manufacturing fault in the sensors on the throttle body that caused the "limp home" mode - usually in stop and go traffic. Jaguar had an inspection and recall on the throttle bodies but that vehicle had gone through 3 different Jaguar dealers for service and none looked at TSB/Recall or performed the necessary checks on the throttle body. Tried cleaning the throttle several times (per Jaguar TSBs) but no change. Had to replace throttle body & problem solved (over 30,000 miles since then). Recommend making sure all air connections to throttle are clean and open and cleaning the throttle area to see if that helps.

On newer Jaguars (and other Al bodied cars) similar problems occur when the "ground" connections to the body become poor (usually through corrosion but sometimes through collisions). Connections may look perfectly normal but have high resistance. Careful when working with the connections - the posts are usually very loosely fastened to the bodies. Good luck.

check the exhaust manifold possible gasket,check flange gasket or check exhaust system for damage --cat converter smells like rotten eggs or if plugs up stalls vehicle and wont let start-----

Fix your car right away, by clicking the link I attached
JAGUAR XK8 1996 2006 WORKSHOP REPAIR SERVICE MANUAL

change the catalytic converter

It just needs resetting.Hold each window switch down until you hear a click at the top and then go down all the way and hold until it clicks at the bottom of its travel.A low battery will cause this sometimes or a  battery change.Tony/Hills Motors, San Mateo, CA

Just a quick mention - for about a month my XK8 low coolant light came on intermittently. This week with no notice while driving normally I got Stability Control Fail and FailSafe Engine Mode and wtih great difficulty got the car back to where I started from (less than a mile). Two days later (when got time) and after a bit of research, I tried it again - same problem and a very unhappy engine. I then disconnected the battery for 15 minutes (probably more) to clear the engine codes as well as check all the wiring and vacuum stuff I could under the hood (at a Jaguar master mechanic's recommendation). No problems found but the car would start and immediately stall with the air intake hose disconnected from the intake butterfly. After I reconnected the air intake hose, she started and purred like normal. The problem is the BATTERY... It is low - I've known it for a LONG time BUT it always started right up and never skipped a beat. I intend to replace it tonight but fully expect that's the issue. I've had the car 6 years (it's a 98) and had NO problems except a dead taillight asembly.

Hope this is of value...