20 Most Recent 1994 Jaguar XJ12 Questions & Answers

sounds like the fuel pump is faulty its in the tank

i guess the previous owner cut the pipes because he did not know how to release them from the tank. they are released by using quick release tools from the underside above the diff, not easy, limited access, i used to tie a piece of string to the tool in case i dropped it on top of the diff, not easy to retrieve.try jaguar heritage for new pipes if they are not available from a jaguar dealer, or the jaguar owners club. not a easy job to do, i removed the complete rear suspension/axle unit to do this job, not easy job without access to a lift. there is 2 pipes, flow and return you should replace both. they came as a pair from jaguar if i recall. you also need to use quick release tools at the front end of the pipes, 2 different sizes, hope this helps

Check for power to the switch and from the switch to the motor. You said you checked it outside, so if you put power to it and it works you have to back track the fault to where the power is lost. It would be no power to switch or no power out of switch or wiring in between.

Umm...take off the park break? Need a little more information.

Change the heater core.

Not necessarily an issue, although annoying...Is there ANY hint of similar surge, while in gear? if not, probably not worth following up, but if yes, keep after it...

So, how fast does it idle in neutral or park? things to look for are too high of an idle, sometimes the ignition advance kicks in a little too soon, and causes what you describe....

Is any other thing causing this, like cycling clutch A/C?

What speed does the enging increase and decrease to?

try chanegen ignition then if not go online from there site.

duplicate question

http://www.radio-code.com/Jaguar-Pay-Page-radio-code.htm

You will need the Serial # found on top of the radio, along with your VIN # I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Check for restricted exhaust creating excessive backpressure. The converter is probably plugged up. This will cause a severe loss of power & lead to further engine damage if not repaired.

I hope this helps.

It means that there is a problem with your onboard engine computer. There is probably one or more sensors the the computer has determined that it cannot trust so it has gone into Failsafe Mode to allow the vehicle to be driven to a repair shop to be diagnosed. It should be safe to drive it to a repair facility, but I would not drive it any further than is necessary to get some assistance with this problem because expensive parts like catalytic converters can be damaged if the vehicle is operated for long periods of time in Failsafe Mode.


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call the queen or look under the hood there may be a sticker showing the diagram

There are two crank sensors on the V12, one crank sensor is located at the front of the engine just behind the crankshaft pulley at the bottom of the engine. There is a second sensor located at the rear of the engine that attaches to the bell housing of the transmission and picks up the signal from the ring gear.