X300 4.0 idling too low??

[fast cars]

Can anyone tell me how to turn this up, currently at 500 rpm (just about!) in drive so stalls way to easily

Thanks

[Hooli]

If it's anything like the XJ40 then you clean the throttle body. There is an adjuster somewhere, can't recall where but I believe 90% of the time it's just a dirty throttle body.

[thejpster]

Hooli said:

If it's anything like the XJ40 then you clean the throttle body. There is an adjuster somewhere, can't recall where but I believe 90% of the time it's just a dirty throttle body.

I believe it's set by the idle air control valve (IACV). Renowned for getting mucky and sticking.

Be aware that if you take the throttle position sensor off and/or muck about with the IACV you might need someone with a Jaguar diagnostic computer to set it up again. You should be all right to take the assembly off and clean it though.