1999 xk8...car has been parked for about 8 months...got in car the other day and started it up...would barely moved forward..not slipping but would barely pull..shift kinda hard into reverse but moves fine...warnings on dash are...check engine light,restricted performance,transmission fault,traction control and stability control warnings come randomly...i had problems with misfire and rough idle before being parked but not the transmission fault...the list of faults are as follows:PO300 mod..1 random/multiple cylinder misfire..2 PO304 cylinder 4 misfire..3 P1316 manufacturer control ignition system or misfire..4 PO121 tps/pedal position sensor A ckt range/perf..5 P1396 mod $11 manufacturer control ignition system or misfire..6 P1643 mod $11 manufacturer control aux inputs aux outputs..7 P1646 mod $11 manufacturer control aux inputs aux outputs..8 P1000 pd mod $11 manufacturer control fuel/air metering aux emissions controls..9 P1396 pd maufactuer control ignition system or misfire..10 P1643 pd manufacturer control aux inputs aux outputs..11 P1646 pd mod $11 manufactuer control aux inputs aux outputs...please someone,anyone help..thanks

 

I would start by down loading a copy of the Jaguar Technical Information System (JTIS) with the real Jaguar code descriptions. Look in the FAQ sticky above or in the FAQ sticky on the XJ8/R forum for the download. That also provides the probable problem areas.

 

cannot download..have windows 7...

 

I have attached a pdf that list most codes you have. Hope you can read it and that it helps. Not a ton of info but maybe more than you had.

 

Before you get too deep into panic or diagnosis, try two things-

1) a hard reset of the car's electronics- sometimes weird things can happen with the electrics when the car's been sitting for extended periods.

2) check your battery for full voltage. Again, when the voltage drops (as it probably has), the electronics can get very wonky and throw out all kinds of messages.

HARD RESET PROCEDURE:

1. Ignition OFF.

2. Disconnect the negative terminal of the battery.

3. Turn key to ignition ON position.

4. Touch disconnected NEGATIVE terminal of battery to the still-connected POSITIVE terminal for 15 seconds or so.

4. Turn ignition back OFF.

5. Reconnect NEGATIVE terminal to battery.

Then start her up and see if things are better. But as above, you need to make sure your battery is at FULL STRENGTH.

Note that anytime you disconnect the battery, you must reprogram the windows. With the doors closed, raise each window to the top and continue to hold button until you hear a faint "click," about an additional 3 seconds. Then lower each window to the bottom and continue to hold the button until you hear the same "click." Voila, you've reprogrammed the windows.

 

will this reset affect the radio..i dont have the code for it..

 

No...those of us in the US don't have to worry about the radio codes.

By the way, just noticed you're in Greer...I'm here in Greenville.

 

did reset..trans and restricted performance went away and all way fine for a few mins..now its back..

 

my immediate concern is getting the trans fault resolved..atleast it will be drivable and i can work on the other issues

 

Do you have a multimeter that you can read the battery voltage with?

 

cool..where abouts you at in greenville?i live near riverside high school off hyw 14..although im not willing to sink much more money into this thing im more than willing to compensate if you may be able to help with any of this..my main concern now is the trans fault..if that can be resolved it will be drivable..thanks scott

 

yes...

 

What is it with the engine off?

 

Take a look here, https://www.jaguarforums.com/forum/g...rchives-65926/

 

i did replace it with a fresher battery but its reading 12.05

 

That is marginal for these cars. You should at least charge it, if not replace it. Then reset the codes and see which ones return.

Also, you should inspect under the car a for a possible transmission fluid leak. Unfortunately there is no dipstick, so the fluid level is not easily checked.

 

put larger marine battery in..reads near 12.50..still after reset, warnings return after a min or so..then trans fault disappears for a min or so and it functions correctly then reappears and will hardly pull forward and shift hard into reverse..the engine runs really smooth until the restricted performance returns shortly after the reset..

 

Check your throttle plug jaguar throttle body plug Clean it and reinstall and see what takes place. Are you sure you had a P0121?

 

yes..i even run the codes twice and all came up the same

 

The only reason I ask is that P0121 & P1121 are both related to the throttle body but only one can be cured with a cleaning or a new set of plugs the other is more involved.