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Discussion Starter · #1 ·
Evening All ,

Not having fun today . GT had not been used for a few days (5 or 6) , when starting today it wound over more than usual and started eventually which I noticed and it puzzled me a bit . Then I went out , pulled away from a junction and put my foot down MSCF immediately came on and went into limp mode . Came home and plugged in and got p0091 and p0094 - which I found very alarming . Checked everything for loose cables etc and reset. Then plugged in Ecu Scan and started car and revved when stationary . On light throttle no problems but as soon as I give it some heavy throttle (fuel pressure getting to 600 or 700 Bar ) MSCF appears and car will actually stall . Car is a very late 2005 and we have had this car since 2008 . In late 2009 we had an Alfa reconditioned High pressure pump and recon injectors fiitted - the diesel specialist that fitted said that the previous owner may have put petrol in at some stage but I don't know for sure why the previous pump failed , all I do know is the symptoms today seem coincedentally like the earlier issues. Car has 1/4 tank fuel , UFI diesel filter fitted in june 2012 . Any opinions would be happily received - at the moment I am thinking pump failure - but don't understand why this could fail again :confused: .

TIA
 

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I would check the connection on the fuel pressure transducer on the fuel pressure rail. Is the fuel pressure looking normal?
 

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Discussion Starter · #3 ·
I would check the connection on the fuel pressure transducer on the fuel pressure rail. Is the fuel pressure looking normal?
Hi ,

I have removed and checked plug on end of fuel rail which looks ok and fuel pressure is looking normal (I think) , see attached . Until I give it some beans and then it falls off a cliff - Not sure if this is the pump failing or something making it cut out .
 

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how many miles has that filter done in 2 years ?
I know theyre not cheap but a new filter would be due soon anyway, for starters.
go to graphs with you selected parameters you have there, remove drv and add total fuel quantity injection.
then go drive and try to recreate fault whilst logging, with a couple of hard accelerations you will possibly catch the fault at least once.
see what figures are way out , fuel pressure or pressure regulator I think regulator spends most of time around 30-40%
 

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if you have a tuning box fitted remove it .........when they start to go wrong you get allsorts of problems

i did see a reference to someone having same problem and a egr clean fixed it but cannot see how that would work
although a stuck egr will make car harder to start and want to stall as its running on exhaust not clean air.........well in theory thats what should happen

i have never come across those codes before
 

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The other thing that could possibly cause it is if the low pressure fuel pump was not working. In that case you would see fuel pressure drop off when demand increases.
 

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Discussion Starter · #7 ·
Filter has only done about 5-6k in that time- but will replace , car was remapped just after we bought it - maybe 170-180 BHP . EGR has had a drilled blank plate for as long as I can recall (but will remove and clean anyway , I did that last summer) l can hear low pressure pump in tank working when ignition is turned on . Will go out in the morning with copilot and take readings as advised . Thanks to all for the input will update.
 

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a new filter wouldn't be first on my list then at that sort of mileage.
maybe try an injector cleaner if this does crop up more frequently, but I would want to know under what conditions and values it triggers these faults, in order to treat and recheck fault has been fixed or treated.
so just log until you get it happen.
is this the first occurance since its been mapped? might just have been sticky hp pump regulator or crud in injector causing excess back leakage.
be interesting to see what maximum rail pressure is getting requested and actually achieved at a decent high load which as a guess for 170hp around 80mm3 on the total fuel injected.
 

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Discussion Starter · #9 · (Edited)
I have just got a genuine filter for £11.00 - so no big deal . A recon pump from Alfa was fitted and haven't had any problems since (10/2009) . Car was remapped in about Jan 2009 . I can get the fault to occur with car stationary by a couple of hefty stamps on the loud pedal. Car is a low usage second car.
 

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shouldn't be hard to catch in a log then ?
seems strange it will do it stationary as fuel injection is fairly low in just an idle rev(comparative to on the move).
 

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Discussion Starter · #11 ·
Not had time on my side today , but a quick update to what I have found . When car is revved reasonably hard it will cut out and die , when this happens you can feel the fuel pump relay click and the fuel pressure dies instantly . I will spend more time at the weekend with laptop but at the moment I am thinking there is an issue with either the pressure regulator on the pump or one the fuel rail , possibly it is sticking and causing the problem . Thank you all for the input so far , will update with more info as and when.
 

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if you ignore your error code this actually sounds like a problem i recently had........totally different codes but my car would sometimes start and run....and then just die.....if i kept it revving high it would run, but in normal driving its not do able..........it was also hard to start after cutting out........anyway to cut long story short i got a auto electrician to look at the wiring and my wiring loom was as he said "shagg3d", 2nd hand one from autolusso and its been fine since.....

maybe worth getting it to a auto leccy to look at it.....they can check continuity through the wires

what he said was happening is it wasnt getting constant voltage and it shut down to protect fuel supply.....ie so it doesnt keep running if there is a error and just pump cylinders full of diesel....my codes where related to the injectors but they where fine
 

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Discussion Starter · #14 ·
Well , I had a secondhand "tested and guaranteed" pump arrive that ran worse than the old unit . So my existing unit has been sent away for rebuild at what I thought a very sensible price . Should have know better , but 3 month warranty , fully tested ... only got my self to blame :tut:
 
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