1996 XJ6 located in Israel, engine goes to 2000 rpm as soon as it is started, it idles rough and smokes. error code is P0727. Please help

 

I won't be much help but sensing a bit of urgency I thought I'd offer a reply until someone better comes along

Enter P0727 into the search box at the top of the page. I know the subject has comes up previously. The code relates, I think, to an engine speed vs road speed discrepancy...or something like that. Perhaps to be expected if the idle is stuck a 2000 rpm?

Common faults causing a high idle are the idle air control valve (I think Jaguar uses a different name...my mind is drawing a blank) fault and/or a dirty throttle body.

Others will chime in

Cheers
DD

 

Had a similar problem with my 2000 S-type. Put a $25 can of BG-44K in the fuel tank. Car runs like new. Didn't really expect much but it really seems to have worked well.

 

Try those things forst, then check back for more indepth suggestions.