throttle body issue on an a 2002/2003 XJR
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Terry007 (09-24-2015)
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I remember looking into this a while back and finding one place doing Jaguar TPS work listing the XJR -- the others only list the non SC cars.
The SC cars have a different Tbody.
I had the fault pop up 6 or 7 times over a couple of months a few years back. My Jaguar had about 50k on it at the time -- it was used infrequently. Looking into the design of the TPS I discovered that it uses a monitored double circuit -- dirt on either leg will cause a fault and restricted performance to pop up.
I don't know if the sealed sensor eventually allows moisture or other matter to enter or if the contacts become compromised -- but something is causing a minor electrical disturbance on the contacts as the sensor turns with the throttle.
With the car off I pushed the gas pedal to the floor -- and repeated this 20 or 30 times -- I did this a few times over a period of days and the fault has never returned. Due to a house fire and the loss of a couple of cars I started using the Jaguar more a bit over two years ago -- Car now has 70k one it.
Unfortunately, for some reason Jaguar does not sell just the sensor -- only as part of the very expensive full Tbody. It's the TPS failure that necessitates the Tbody replacement. I have never seen any mention of a cross referenced part used on another car -- It's a part that does fail on other cars and is normally cheap and an easy fit.
The early non SC cars had a program to replace the Tbody. I forget what the problem was -- but the car would stall.
The Tbody either works or they don't -- I have heard of cars being sold (cheap) by owners not knowing that the Tbody could be fixed for a few hundred dollars + labor vs the 3k+ for the replacement.
The SC cars have a different Tbody.
I had the fault pop up 6 or 7 times over a couple of months a few years back. My Jaguar had about 50k on it at the time -- it was used infrequently. Looking into the design of the TPS I discovered that it uses a monitored double circuit -- dirt on either leg will cause a fault and restricted performance to pop up.
I don't know if the sealed sensor eventually allows moisture or other matter to enter or if the contacts become compromised -- but something is causing a minor electrical disturbance on the contacts as the sensor turns with the throttle.
With the car off I pushed the gas pedal to the floor -- and repeated this 20 or 30 times -- I did this a few times over a period of days and the fault has never returned. Due to a house fire and the loss of a couple of cars I started using the Jaguar more a bit over two years ago -- Car now has 70k one it.
Unfortunately, for some reason Jaguar does not sell just the sensor -- only as part of the very expensive full Tbody. It's the TPS failure that necessitates the Tbody replacement. I have never seen any mention of a cross referenced part used on another car -- It's a part that does fail on other cars and is normally cheap and an easy fit.
The early non SC cars had a program to replace the Tbody. I forget what the problem was -- but the car would stall.
The Tbody either works or they don't -- I have heard of cars being sold (cheap) by owners not knowing that the Tbody could be fixed for a few hundred dollars + labor vs the 3k+ for the replacement.
The following users liked this post:
Terry007 (09-25-2015)
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Chet Ramnarain (bozzner)
XJ6 & XJ12 Series I, II & III
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09-03-2015 12:21 PM
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