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Anthony, Jaguar Technician
Category: Jaguar
Satisfied Customers: 11752
Experience:  ASE Master Automobile Technician with over 20 years exp. in this field.
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Jaguar XJ6: I have a 1995 XJ6 (X300) and my engine idles at

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I have a 1995 XJ6 (X300) and my engine idles at 10,000 even after it has warmed up. Also, when in "D" it will take off by itself and run at about 10 mph. I replaced the idle control valve, but this did not solve the problem. Any suggestions???
Hello! Welcome to justanswer!

Thats a vacuum leak. Have the intake smoke tested to see whats leaking. And of course repair it.

A vacuum leak causes high idle...
Customer: replied 4 years ago.
So you are saying that only a vacuum leak would cause the high idle in park and drive, or hat is usually the case?
Sorry for the delay....

Yes, only a vacuum leak causes your problem of high idle with the throttle closed.
Anthony and other Jaguar Specialists are ready to help you
Customer: replied 4 years ago.
Last question,
What does a repair like this usually cost? I realize its only an estimate.