hi all , my glow plug light only stays on for a few seconds when i want to start it so it does not start very well , is that a glow plug problem or is there a relay some where that might be no good ,

 

No diesel S-Types in USA/Cdn so don't expect a lot of replies...

 

the glow plug light should only stay on for a second or 2 on modern diesels. i have driven some where it doesn't come on at all unless really cold.

what issues are you having ?

 

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 ?