I am a new Jaguar owner. I purchased a used 99 XK8. It's turning out to be a huge headache, but I have too much invested to sell it. I have replaced the throttle body, abs module, cam cover gasket, the water pump, thermostat, and hoses.
Now a new problem is arrising and the car is unusable. Whenever I start it up, it immediatley hits 5000 rpm's and rises slowly then drops back down to about 4000 then goes back up. If I leave it alone and let it race out then it will eventually come down on it's own. Unfortunatley it gets pretty close to redlining, so I don't let it work it's way out. Engine failsafe mode also comes up on the message center. If I give it a tap of the gas to bring the idle down, it comes all the way down and stalls and the message center changes from just engine failsafe mode to traction control failure and engine failsafe mode.
Anybody here have any suggestions? I am pretty much at a standstill with the car.
Now a new problem is arrising and the car is unusable. Whenever I start it up, it immediatley hits 5000 rpm's and rises slowly then drops back down to about 4000 then goes back up. If I leave it alone and let it race out then it will eventually come down on it's own. Unfortunatley it gets pretty close to redlining, so I don't let it work it's way out. Engine failsafe mode also comes up on the message center. If I give it a tap of the gas to bring the idle down, it comes all the way down and stalls and the message center changes from just engine failsafe mode to traction control failure and engine failsafe mode.
Anybody here have any suggestions? I am pretty much at a standstill with the car.
Veteran Member
Hey pal, go get an OBD-II code reader from autozone and get the codes that the system is throwing so that we can better help you.
Senior Member
My best guess would be the TPS "Throttle Position sensor"
if you hook up a volt meeter to it, watch the voltage coming from the TPS. if it is going way up when it is surging and you are not activating the throttle, then replace the sensor. Thats what i would try.
if you hook up a volt meeter to it, watch the voltage coming from the TPS. if it is going way up when it is surging and you are not activating the throttle, then replace the sensor. Thats what i would try.