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Old 22-10-17, 04:03 PM   #1
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Default 07 expert fuel pressure issue

hi all
first post and after knowledge already, I have just recently bought an 07 expert3 2.0 hdi 120, regularly serviced 97k miles drives ok if a bit noisy and jerky at times, ***if you give it a boot full in 3rd revs over 4k it shuts down and knocks its nuts off with eml on, fault code is poo88 fuel pressure regulation too high, now is this going to be the regulator at fault and if so is the regulator on the pump or rail and is it just a replacement part ?? other than this its a good van and don't want to return it and the seller has agreed to pay for the part.
has anyone had the same issue, no amount of revving can recreate the fault it will only do it under load.
any help would be great
cheers chris
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Old 22-10-17, 04:47 PM   #2
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Sounds like you are hitting the fuel pressure upper limit but there are a lot of things that could be the cause and the fault code is telling you the fault NOT the reason.

You would need live data readings to see what is happening it could be a bad injector leaking back too much fuel this in turn means the pump has to work harder and once it hits the upper limit the ecu will shut it down for safety.

It might be a faulty regulator this is on the pump.

It might be a faulty READING from the pressure sensor making the pump feed more than needed to the rail sensor is on the rail.

It might simply be a bad connection or dodgy wiring.

Needs more investigation fault codes tell you what HAS happened live date tells you what IS happening.
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Old 22-10-17, 06:30 PM   #3
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Also worth checking if it got a cheap tuning box fitted or if previous seller ever had it mapped.
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Old 23-10-17, 07:55 PM   #4
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hi windy, no tuning box fitted
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Old 23-10-17, 08:00 PM   #5
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I do have some more data, the flow rates of the injectors was the same but in pairs if that makes sense, 2 had one reading and the other 2 had a different I think 1and 3 and 2 and 4 cant remember the readings , this is the pressure readings tested in a non moving state
798 rpm pressure measured 298 bar
reference fuel pressure 298 bar
12% regulator ocr

2176 rpm pressure measured 619 bar
reference fuel pressure 611 bar
14% regulator ocr
3168 rpm pressure measured 776 bar
reference fuel pressure 753 bar
15% regulator ocr

4284 rpm pressure measured 692 bar
reference fuel pressure 713 bar
16% regulator ocr

does this bring anymore light to the situation
cheers chris
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Old 25-10-17, 07:04 PM   #6
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All sorted, was stuck pressure reg on bottom of pump, new reg fitted and drives smoother, quieter and no going in limp mode
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Old 25-10-17, 07:32 PM   #7
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Thats good well done for coming back with the fix as most dont bother
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Old 25-10-17, 07:38 PM   #8
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I know how it goes mate, nothing worse than getting ideas but no answers, I will say on comparing the 2 the moving part of new one was flush vs old one sticking out app 1 mm
Next jobs possible remap and cruse add
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