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Fuel pressure problem with S3, please help!!

Discussion in 'A3/S3/Sportback (8P Chassis)' started by vijays786, Dec 28, 2011.

  1. vijays786

    vijays786 New Member

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    Hi,

    I'm expericing some problems with my car again.

    The thruttle is not really responding and the car is shaking and it doesnt have any power.

    It takes a long time for the car to get some speed and it's like the car is drowning in fuel.

    I connected the computer and it says fuel pressure regulator 2 fail.

    And the EDC and Engine lights up in DIS.

    I'm trying to locate the Fuel ressure regulator valve, but i'm a little confused.

    Can anyone point out where to look. Post a Picture..

    That will really help.

    [​IMG]

    My Mechanic cant seem to find it.

    Some help please.....
     
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  3. s3ollie

    s3ollie Member

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    The high pressure regulator is 3 in the pic. 3 cant be brought (new) seperatly from the HPFP. There is also a fuel rail pressure limiting/regulating valve, that is 10 in the pic however this a mechanical valve that bleeds the rail pressure if it reaches 130bar. There is also a regulator in the fuel filter again this is a mechanical valve and not electronically controlled.

    11 is the thrust sensor and is used for sensing the rail pressure.
    4 is the low pressure thrust sensor used to measure pressure in the low pressure system.

    You really need the full DTC to decided what valve is faulty
     
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  4. vijays786

    vijays786 New Member

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    It says:

    P2294 on the DTC is that enough to decide it?
     
  5. s3ollie

    s3ollie Member

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    P2294 Fuel Pressure Regulator 2 Control Circuit/Open

    Looks like there is an open curcit. You could try checking the wiring as there maybe a plug off or a break somewhere?
     
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  6. warren_S5

    warren_S5 Moderator
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    Fuel pressure regulator circuit open.

    I'd assume it would be worth starting with part #10, but whilst it's cheap, it's a ***** of a job as its located between the manifold pipes (from memory), so you may need a special or modified tool to do it.
     
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  7. warren_S5

    warren_S5 Moderator
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    On a side note, have you checked the cam follower recently?
     
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  8. s3ollie

    s3ollie Member

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    Warren I think the open circuit is refering to an open eletrical circuit. 10 is a mech valve and isnt electronically controlled
     
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  9. vijays786

    vijays786 New Member

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    I'm told that i need to change item 4 or 11 to get it to work. Is that possible ??
     
  10. S3Alex

    S3Alex Rarely neutral
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    It's worth saying that the plastic housing containing wiring from the top of the HPFP can crack...this happened to mine last year,and basically the car has no idea of what the fuelling is doing.

    The black plastic at the top of the HPFP is worth checking over for hairline cracks.
     
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  11. vijays786

    vijays786 New Member

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    Is this what you are talking about?

    http://i146.photobucket.com/albums/r248/gu4800/1Large.jpg

    Checked it and does not look like thère is any problems with it.

    Why is when i go to Audi and say "Fuel pressure regulator valve (open circuit)"
    They look at mé like i'm from another planet and they have never heard about this.
    And p2294 they dont understand aswell because they use another system.
    They use one letter and three numbers as code he told me. Some help....
     
  12. S3Alex

    S3Alex Rarely neutral
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    That picture you've put up shows a horizontal crack from side to side across the top of the assembly.

    You can actually see where there is a gap between the two halves of the plastic fitting,and the top of the assembly should be flat around the hub where the wiring harness enters....that one has a large step in it.

    This is exactly what had happened to mine and will mean a new HPFP...don't drive the car in the meantime as it has no idea of it's fuelling,and you could damage it badly.

    This is yours that you've posted I hope.

    EDIT.....I can see you've got that pic from somewhere else....would have helped if you'd mentioned that.
     
    #11 S3Alex, Dec 29, 2011
    Last edited: Dec 29, 2011
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  13. warren_S5

    warren_S5 Moderator
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    New pump is £177 from Audi dealers.

    Same thing happened to my VVT sensor on old S3 (cracked day before I was doing a road trip to Europe). Had to fit it myself and wasn't 100% straightforward.

    There are plenty of guides on here as to how to change the pump so quick search will reveal all.
     
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  14. s3ollie

    s3ollie Member

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    11 and 4 are your high and low pressure sensors I doubt replacing them will fix you issue. From the code you have it suggests and open circuit to your regulator, this mean you have either a bad connection, a broken wire, a plug not connected or a bad regulator. You can do a output test for the regulator n276 in the engine module through vcds
     
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  15. vijays786

    vijays786 New Member

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    S3Alex i'm sorry that i did'nt write that the picture was not mine, it was the only picture i could find.

    S3ollie i doubt my mechanic knows how to output test for the regulator n276 in the engine module through vcds.
    Anyway guide for this?

    I'm getting really frustrated over this problem:keule:. I will try to find out what it might be and still if anyone have some suggestions please do collaborate...

    I'm really happy that you guys help so much!
     
  16. Kelza

    Kelza MODERATOR
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    Hi vijays where abouts are you from there are some great audi specialists through out the country that would sort this problem out for u , with out you pulling yout hair out..
     
  17. vijays786

    vijays786 New Member

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    #16 vijays786, Dec 29, 2011
    Last edited: Dec 29, 2011
  18. Gavin0478

    Gavin0478 Active Member

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    have you checked the relay you replaced is correct and is not loose or any of the wiring in that area has been disturbed?
     
  19. vijays786

    vijays786 New Member

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    I Have also had some problem with the relays on the car. It could'nt be a Fuel Pump Relay or something like that?

    These are the error codes for now
    P2294
    P0657
    P0444

    Earlier today
    p0657
    p0444
    p2294
    p0031
    p0036
     
  20. vijays786

    vijays786 New Member

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    We think a like Gavin. Garvin Audi changed them for me and had a diagnolist on the car. So i'm guessing he did his job. I picked up the car from Audi when they were about to close and right there it did not seem like the car had any problems. When i left the problem started immediately and Audi was closed. Now they have a long wating, because of the new year :-(
     
  21. dave.c

    dave.c New Member

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    Hello there my name is David from the seat forum (hope you don't mind me popping in?)

    I drive a seat leon tfsi sport revo stage2+

    Anyways...

    Sounds very much the same as me mate.

    Have you checked your Cam follower
    and the piston etc? Any photos aswell?

    It's more than likely your going
    to need a new High pressure fuel pump!

    But check the other things first,
    By the way changing the follower will not resolve the issue.
     
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  23. dave.c

    dave.c New Member

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    Oh some people would advise to change the thrust sensor that is fitted next to the fuel pump...but I don't think from experience its going to be this on your car.

    Its very likely to be the N275 sensor which is located on top of the HPFP HOWEVER they don't sell it as a single item, it comes with the pump as complete unit. (annoying)
     
  24. Gavin0478

    Gavin0478 Active Member

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    what is this cam follower issue that keeps cropping up?
     
  25. dave.c

    dave.c New Member

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    Just a design flaw with the 2.0L TFSI engines, there is a fix for it but it involes alot of money and time + effort...

    Hmm not sure how to explain it but even on standard engines they can cause issues (where the err camshaft is rubbing on the follower)

    Cam Followers and Oil Changes – A Warning « markFive GTI

    This should explain it alot better than I can... ;) Enjoy
     
  26. warren_S5

    warren_S5 Moderator
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    Poor quality design of fuel pump by VAG. cam lobe causes wear on the cam follower tip over time, and if you tend to rev the car the quicker they seem to fail. Worst case scenario is that the cam follower actually wears through.

    KMD do an uprated cam follower for about £70 (instead of £25 for OEM), but I'd be worried as it's harder that it may score the cam lobe. I think it's just best to change the cam follower every 20-30k as part of your maintenance programme (get indy to do it as VAG dealers probably won't want to check it as its not on service schedule).
     
  27. Gavin0478

    Gavin0478 Active Member

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    does relpacing the internals of the hpfp as it seems you have to do to get to stage 2 increase the wear then?
     
  28. dave.c

    dave.c New Member

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    Hey Warren How are you ;) not seen you on the forums for awhile! i hope you are well, I believe I was nagging you before about the Forge catch can! hehe

    Ps. I don't know anyone that uses the KMD cam follower, its way too expensive and I don't think its coated.

    Everyone sticks to using the oem follower as its still by far the best follower out there, its just annoying to change it.
     
    #26 dave.c, Dec 29, 2011
    Last edited: Dec 29, 2011
  29. dave.c

    dave.c New Member

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    ???
     
  30. warren_S5

    warren_S5 Moderator
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    Yes, but it seems improved with the later generation internals.

    I had KMD internals on my last car and they wore the internals of the pump so badly new seals didn't remedy the fuel leak. I had to have a whole new pump. It was a very early kit, so pre the new version with uprated coating / materials that are used in latest KMD / Autotech kits. The revisions have made them far more reliable.
     
  31. s3ollie

    s3ollie Member

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    Go in to the engine module 01 click on output test choose n276 from the list click start test. the regulator should start cycling on and off however if you have an open circuit then it wont work as there is a break somewhere as mentioned
     
  32. JaCkPoT

    JaCkPoT Member

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    Please dont think im post clocking or anything, i understand that on some forums, an email is sent when a new post is made on a thread.....Id just like to know if the OP got to the bottom of this and how it was fixed? 2 years old, i apologise...
     

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