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Jay30685

Car Wont Start Please Help P0251

13 posts in this topic

After battling with my fuel system for some time, I changed the lot. Tank, sender, filter, pump, rail, injectors, and all pipes. It took some getting going but eventually started. Then when fired on key, it would sit at 500rpm struggling to run for about 5 seconds then ran great. After no more than 30 miles, it started to cut out on motorway, I kept having to bump it off. Then as I was leaving the motorway it shut down fully and wont re start. I have also just had the electronic actuator refurbished as that was faulty before. I have read the codes and got P0251. Any ideas? Thanks

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Wow, you must have spent some amount of money doing all that!

Have you thought of going to a diesel specialist? It might have saved you a fortune and a lot of hassle in the first place.

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Yeah, not as much as you would think, I had a doner car for most of parts. I have done all the work myself. Diesel specialist quoted £ 1500 for the fuel system

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if you google the error code you get a lot of hits. A lot of them had faulty injectors.

You say you changed the injectors and a lot of other stuff in the fuel system. The whole system (after the fuelfilter) is highly sensitive to foreign matter so maybe something got into the fuelsystem.

First thing i would do is a leak off test off the injectors. Big change it's one of them that's causing the error if you're "lucky" ;) .

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Yeah, not as much as you would think, I had a doner car for most of parts. I have done all the work myself. Diesel specialist quoted £ 1500 for the fuel system

Well maybe not so bad having the donor car atleast.

Did the diesel specialist have the chance to look over the car? I doubt very much the whole fuel system needs replaced. But it does sound like it will need some specialist equipment to help diagnose correctly

Not familiar with your engine but I take it the injectors have been coded correctly if required

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I haven't had them coded, but it did run fine, ive just spoken to a couple of diesel specialists and they have advised leak off check to see if an injector is dumping.

They both said un coded injectors should still fire up.

I will advise the outcome. Thanks

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£1500 & they dont even know whats wrong? run as fast as you can,in other direction & goto someone else. A good specialist wouldnt ever tell you that,before finding out what the problem is.Its a piece a !Removed! for them to find out whats-up. Also,leak-off tests dont mean squat. A leak off test wont necessarily show a duff injector problem by the way.(i know thru experiance lol).

you'd be surprised how many folk go getting a leak-off test,it shows nothing outta the ordinary,then they move towards fuel-pump,sender,metering valve etc, & guess what.it was the injectors all along.

If you goto a reputable diesel specialist,he WILL find the problem. But I'd be very wary of anyone telling you it'd most likely cost 1500 before even looking into it properly

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The ECU is coded to the injectors and the electronic actuator - the pump is not coded on the TDCI

the ECU matches the transponder and locks, so if you keep all these parts the same and keep the injectors in the same order - you should be ok - if you change any of it - it may not start (may even be immobilised) and may need recoded , the injectors preferably by a Delphi specialist

The Delphi injectors on the mk3 TDCI were designed to be used with pre- 2007 high sulphor deisel - modern diesel tends to wear the inectors out quicker (the sulphor in the diesel helped to lubricate them)

The 2.2 engine in the Euro4 ST-TDCI is almost identical to the Euro4 2.0L TDCI but with a different stroke and share many components

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The ECU is coded to the injectors and the electronic actuator - the pump is not coded on the TDCI

the ECU matches the transponder and locks, so if you keep all these parts the same and keep the injectors in the same order - you should be ok - if you change any of it - it may not start (may even be immobilised) and may need recoded , the injectors preferably by a Delphi specialist

The Delphi injectors on the mk3 TDCI were designed to be used with pre- 2007 high sulphor deisel - modern diesel tends to wear the inectors out quicker (the sulphor in the diesel helped to lubricate them)

The 2.2 engine in the Euro4 ST-TDCI is almost identical to the Euro4 2.0L TDCI but with a different stroke and share many components

so does the 155 version still play up with injectors dmf and pumps this is what put me off buying a diesal mondeo went petrol instead

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so does the 155 version still play up with injectors dmf and pumps this is what put me off buying a diesal mondeo went petrol instead

Yes, they do, but some people buy very high milage cars and are then surprised when they give trouble

All cars have their faults - i have ran my deisel mk3 for 8+ years now, - its still running strong, fast and economical

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Its one of the biggest myths-high mileage cars etc. Theres 2 mk4 Mondeo's sitting in ford dealers nr me with 24k & 39k,BOTH with fuelling problems

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Wel I think ive sorted it, a guy came out today and coded my injectors in, the 504z's wouldn't fire even after they had been coded. Put my 501z's back in.. which diesel specialist told me needed replacing, coded them up, ran lumpy for a bit. 30 miles on they run sweet.

Think naybe 1 is sticking a bit but he has advised me to run it for a few days and see what its like before a leak back test.

100% happy with the guy who came out today.

Yes car had full service, everything done, has 142k on clock wuth full service history

AndrewGallon likes this

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Its one of the biggest myths-high mileage cars etc. Theres 2 mk4 Mondeo's sitting in ford dealers nr me with 24k & 39k,BOTH with fuelling problems

my last carwas a renault 172 sport 2003 i bought it for a low mileage example 40k had endless problems with it so next car i just bought is a petrol mondeo with 148k on her lets see how she goes have to agree with the post above

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