53 plate TD4 won't start - HELP PLEASE!!!!!

My girlfiend's TD4 has been sluggish to start for a while now, and now just cranks over. We've replaced the diesel filter, diesel hoses to the injectors in case of air getting in, and latest install is new heater plugs, all without success. We notice the dash has the little orange spring there to indicate that the heater plugs are heating; this is NOT illuminating when the ignition is put on but we're not sure whether it's actually meant to, or ever has actually lit up. My friend thinks there's a problem with the live to the heater plugs; it starts straight away off a tow and diesel is being pumped ok to the injectors. Can anyone shed any light please and also which is the relay for the heater plugs - colour and location PLEASE?? Alternatively - does anyone think it's immobiliser related - is it a common problem? ALL HELP GRATEFULLY APPRECIATED!!!

if you posted this in the right place you might get the answer you want ffs

Thanks for that friendly and helpful reply.

90boy said:

if you posted this in the right place you might get the answer you want ffs

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Ermmmmmmmmmmmmm where do I post this if not in common faults and questions.....ffs.......

Bizza said:

Ermmmmmmmmmmmmm where do I post this if not in common faults and questions.....ffs.......

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Could try the Gaylander section

Dont know if you have it sorted. The problem will be 99% due to one or more failed injector. If you look on the site you will find a easy check to prove it. Only down side is around £150 per injector.

had exactly this on my 53 plate td4. got harder and harder to start through the day, next day, just gave it bollocks all together and refused to start. My local independent garage could get it to fire and run everytime using easy start (not desirable, but they had to move it about and do diagnostics). Turned out it was a failed injector causing excessive leakback. While they had it, had all 4 taken out and refurbished, as I didn't want more down time for the same fault. Since then touch wood....

Good luck to you

just to explain, when the engine is running the high pressure pump runs a 28000 psi, but when cranking it it only 6000 psi, so if there is a leaking injector the pressure sensor on the rail will not allow the engine to run. Easy start fools the sensor but can cause a cpu fault and may need a hook up to clear it

Same here, failed injector, replaced all 4 and touch wood !