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No diesel S-Types in USA/Cdn so don't expect a lot of replies...
STR 2004. Acronyms: http://www.jaguarforums.com/forum/s-...-jaguar-78910/
If you would like the most accurate assistance, it is very helpful to place your vehicle information into your signature line, just look in your member control panel to set it up. Info like year, model, engine size, and other details like mileage can only aid in receiving more replies with the correct information. (thanks, h20boy!)
the light does not stay on very long , it will start but not very well i have to rev it a bit to keep it running if i dont rev it it cuts out instantly , after it has run for a 10 or 20 seconds its ok , it seems to miss fire a bit for the first few seconds , i have had it 18 month and it has all ways been perfect up till now
i know nothing about the jag diesel but know a little about diesels in general, i don't think it's a glow plug problem, glow plugs are only used to heat the chamber and surrounding area of the engine block up before you start the car, a diesel engine works solely on compression to raise the temperature of the air to a point where the diesel will combust spontaneously when introduced to the hot high pressure air (unlike a petrol engine that needs a spark to ignite the air/fuel mix).
The "glow plug" light will switch off when the chamber is up to temp, and the glow plug will switch off as you start the engine (some engines keep the glow plug on for a bit to help lower emissions)
so if the light goes off, and the car starts, that makes me think something else is the problem
when was the last time it was serviced and had the filters changed ?
have you checked for codes ?
did the light used to stay on longer ?
what's the mileage ?