Question about 1995 Jaguar XJ6

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Jag XJ6 revs are too high

I HAVE A 95 JAG XJ6 3.2 PETROL AUTO.THE ENGINE IS CONSTANTLY RACING,FROM 1200RPM UP TP 2000RPM.I REPLACED THE IDLE CONTROL VALVE AND THERE ARE NO AIR LEAKS OR ANYTHING.THE CRANK SHAFT SENSOR HAS BEEN REPLACED ALSO.THERE ARE 2 SENSORS ON THE THROTTLE CASING.1 ON TOP AND 1 ON THE BOTTOM OF IT.IF I CONNECT THE WIRED CABLE TO THE BOTTOM SENSOR.THE ENGINE WONT START.BUT IF I LEAVE IT DISCONNECTED THE ENGINE WILL START BUT STILL RACING.I HAVE A FEELING THIS BOTTOM SENSOR HAS SOMETHING TO DO WITH THE REVS BUT DONT KNOW WHAT.LIKE I SAID,THE IDLE CONTROL VALVE WAS REPLACED WITH A BRAND NEW ONE SO I KNOW ITS NOT THAT.OILING THE THROTTLE ISNT DOING ANYTHING EITHER.ANY HELP AT ALL WOULD BE MUCH APPRECIATED............

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  • stuecampbell Jan 25, 2009

    I have a similar problem. My 1995 XJ6 x300 idles between 1800 and 3000. I have not vacuum leaks and have replaced the whole throttle body including the throttle positioner and the ICV at the top of the throttle body.
    I am stumped!
    Any help would be appreciated.


  • Glen Byrne Feb 22, 2009

    cleaned the throttle body carefully.still the same.im losing hope.......

  • Ian Jones May 11, 2010

    sounds like air leak to me!

  • drife May 11, 2010

    Hi glen the sensor on the bottem of the throttle body is the throttle position sensor it also cuts out the injectors on throttle over run. Has the sensor moved it is adjustible, if you are sure there are no air leaks remove the rubber inlet and check the throttle butterfly gap to the body should be a tight 2 thou, there is a allen key adjustment at the stop.  One last thing when the car is running is the throttle returning to the stop  

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If you have replaced the Throttle postion sensor (TPS) or have replaced the battery, sometimes the car will need an engine set up.
I had the same problem with my xj6 and I did an engine set-up and it has been fine for the last 2 years. Also with the idle doing what it did it had a very harsh shift when driving and changing gears.
The BAD news is the dealer has to perform the engine set-up using the WDS (worldwide diagnostic system) The set-up will set the kick down switch, it will calibrate and set the TPS and also perform an oxygen sensor orientation test.
With the set-up it will allow the TPS sensor to be adjusted to the correct factory specs.
Sorry you can't do this your self.
This is obviously if there is no vac leaks and the throttle butterfly is set to 2 thousands of an inch. (gap on the side when closed throttle) check with a feeler guage.
JPTCAT

Posted on Feb 17, 2009

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