Alfa 147 error P0091

Hi to all
I have a problem which I can not give resolution.
I have this 147 from January 2015 and in the first months did not give trouble, the whole ori ecu included.
For some time when I started to enter in the world of tuning, I started to map doing maps wrong, which, all, after a while I gave recovery error p0091.
Thinking that it was a scalibrata map I always let it pass and changed the map.
Today I have a map definitely calibrated made as a test study from a user of the forum with whom I'm collaborating for various things but the problem persists.
I thought it was dirt in the pump immersed in the tank, then disassembled it and cleaned what I could and it was truly foul but to the eye, in the tank there seems to be nothing visible.
I have noticed that cold I can also accelerate to 100% with no problems, but hot is nasona clicks into recovery and it goes like if it was sturbinata..
If it was the pump from the review you have a document as you dismantle, piece by piece, or I don't know what else it could be.
The car is fully serviced recently and the fuel filter there is pressure it seems.
I'm going crazy to understand what it is that is wrong..
Help!!!

Hello, you need to check the rail pressure ....

Hello friend,
forgive me but I'm a hoe on the diagnosis ..and even more..
With MES you view with a few entries of the real-time or what else should be done?

it tells you the circuit press rail circuit/range performance?
if you carefully monitors the pressure on both the objective that the actual way of diagnosis and see if you differ very much in positive or negative..if it is in the latter case, i.e., is low, because the map requires that you have a problem on the high pressure pump or on the regoltaore or on the injectors "download" too....check this last also diagnosis correction that if are in the 25% +/- of the time limits established in the ecu, or more than 5mm3 correction in iq are to be reviewed..

could you try to replace the map ori is to see if there is difference on what I said before..
then, however, before addosare the fault to a component rather than another controls the pressure of the electric pump in the track of the low pressure if it's low, sometimes I have that connection with a sphere planted inside that is on the fuel filter you starasse, and did lower the pressure only at high rpm with large diesel requirements while if controlled the press least everything was in the norm..

Thanks munro
Already proven with the map ori, and not from that error, only with increases in the hot above the 3000giri.
Having already changed the high pressure pump with a second hand but working (this was on an alfa the first series that was mapped and it was fine) I think is not the problem..I think..
A friend of mine has removed the piping above the filter and saw that the fuel it comes in and then does so only in terms of this problem.
I will do the diagnosis and I'll know.
Thanks

The error I believe it was :
P0091 "fuel pressure regulator (inlet of the high pressure pump)pressure too low"

you can not disconnect the tubes and see if it throws the nafta, these things have to be done with the method and instrumentation, you have to put a pressure gauge and see the low pressure, the high the see in diagnosis, and I suggest you to also check the pressure in the return oil, another thing, I don't know how much, but if you've raised much the rail pressure test put back ori one.

Quote:

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Originally Written by ugoboss

you can not disconnect the tubes and see if it throws the nafta, these things have to be done with the method and instrumentation.

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Fully agree with that, but not being of the profession, at least I saw that the oil reaches.
Do I check the pressure I see on the mes if I cali.
Thanks guys

I found a discussion with the same problem to my and on the sites alpha, many (if not all) have had this problem..
http://www.professionalchiptuning.ne...ighlight=p0091
I know that the high pressure pump is the cause, and to change it costs as much as my left leg..
I'll know as soon as I set the hands with the esm and hopefully not that..