Notices
 
 

  

User Tag List

Thread: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction

Page 1 of 3 123 LastLast
Results 1 to 10 of 23
  1. Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #1
    Join Date
    Mar 2010
    Location
    Deerfield, NH, USA
    Posts
    18
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Ok... having trawled through the US Audi forums (I defected to the US around 5 years ago) trying to find a solution to my ongoing issues, I stumbled upon this forum. It seemed like there was a bit more knowledge flying around so figured I might get some better responses here.

    Here's a brief history:

    Car is a 2006 A4 2.0T with 120,000 miles, no mods
    Experienced some power loss under hard acceleration which felt like a fuel cutout
    Was getting a P2933 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction code.
    Also getting a B310 code.
    The dealer changed the high pressure fuel pump, camshaft and follower under an extended warranty
    The B310 went away but the power loss and P2933 came back
    The dealer diagnosed the in-tank fuel pump (working too hard)
    Changed fuel filiter and the in-tank LP fuel pump
    No change to the symptoms.

    Below is a VCDS log from before the LP filter and pump change. Below that is a link to a longer log (.xls) after the LP fuel filter and in-tank pump change.You can see the HP pressure drops and corresponding values fro engine speed, LP pressure, throttle angle, LP pump, etc.

    To me it looks like the problem is on the HP side, i.e. the LP fuel readings seem fine but the HP readings drop from over 100bar down to single figures. Despite these logs, both the dealership and forum posters keep suggesting the LP side. I can see how a problem with the LP feed would affect the HP feed but if anything, the LP value is at its highest when the HP is failing...!!!

    Any suggestions what might be causing these issues?





    http://www.legoheads.com/VCDSx1.xls
     
    0 0 0
     

  2. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #2
    Join Date
    Nov 2008
    Location
    Cramlington,Northumberland
    Posts
    1,979
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    20 Post(s)
    You dont say why the Dealer changed the Pump etc. What was the diagnosis for them to be suspect? Worn ? Maybe the Fuel rail pressure regulator or sensor?
    Alan.

    A6 Avant (C7) 3.0 TFSI Quattro S-Tronic
    APR St1 Custom Exhaust - now gone
    VW T6 150 DSG Camper £££
     
    0 0 0
     

  3. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #3
    Join Date
    Sep 2011
    Location
    Lurking over a keyboard ...
    Posts
    5,360
    Post Thanks / Like
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    2 Post(s)
    There is a VAG TSB / TPI where the 2.0 TFSI engine can get the following DTC logged:

    P2293 control valve for fuel pressure, mechanical complaint
    P1093 fuel pressure control, below limit
    P0087 fuel rail/system pressure too low

    Symptoms described as engine warning light on, often in connection with erratic engine operation or poor performance in the upper load range.

    This is due to wear of the drive cam for the high pressure pump, the necessary pump piston lift is not reached causing rail pressure fluctuations. The wear on the cam often leads to wear of the bucket tappet base which may disintegrate.

    What is your engine code?
     
    0 0 0
     

  4. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #4
    Join Date
    Mar 2010
    Location
    Deerfield, NH, USA
    Posts
    18
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Below are the original codes that prompted the dealer to carry out the TSB on the HPFP, follower and cam. Ignore the first one; I forgot to replug following an oil change...

    Following this work, the P2293 has returned but rarely puts the CEL on, only once after frequent multiple occurrences. And like I said, changing the LP pump and filter made no difference either. I did see a thread related to a pressure relief valve that bleeds of fuel from the HP side when it exceeds either 116? or 126? bar depending on the car model. I also saw something regarding the HP fuel pressure sensor, which if faulty could fool the ECU into thinking pressure is low and causing it to cut power (similar limp to mode). If this is the case, it seems like it only fails when HP pressure is at or near its maximum.

    I was wondering if either of these could likely be at fault in my case. In the later case, I may try to run the VCDS logger again and add the lambda value to see if it's genuine fuel cut or the ECU sticking its nose in...


    Sunday,22,June,2014,08:53:07:46862
    VCDS Version: Release 10.6.0

    Address 01: Engine Labels: 06F-907-115-AXX.lbl
    Control Module Part Number: 8E0 910 115 M HW: 8E0 907 115 D
    Component and/or Version: 2.0l R4/4V TFSI 0070
    Software Coding: 0104010A190F0120
    Work Shop Code: WSC 08144 444 84095
    VCID: 2B5E05F2B55F2644
    3 Faults Found

    005491 - Left Engine Mount Solenoid Valve (N144): Open Circuit
    P1573 - 004 - No Signal/Communication - Intermittent
    Freeze Frame
    Fault Status: 00100100
    Fault Priority: 0
    Fault Frequency: 1
    Mileage: 187418 km
    Time Indication: 0

    Freeze Frame
    RPM: 740 /min
    Load: 21.2 %
    Speed: 0.0 km/h
    Temperature: 69.0°C
    Temperature: 49.0°C
    Absolute Pres.: 1000.0 mbar
    Voltage: 13.589 V

    012555 - Low Pressure Fuel regulation: Fuel Pressure Outside Specification
    P310B - 004 - No Signal/Communication - Intermittent - MIL ON
    Freeze Frame
    Fault Status: 10100100
    Fault Priority: 0
    Fault Frequency: 6
    Mileage: 187483 km
    Time Indication: 0

    Freeze Frame
    RPM: 994 /min
    Load: 71.0 %
    Speed: 6.0 km/h
    Temperature: 33.0°C
    Temperature: 33.0°C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.097 V

    008851 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction
    P2293 - 002 - Lower Limit Exceeded - Intermittent
    Freeze Frame
    Fault Status: 00100010
    Fault Priority: 0
    Fault Frequency: 1
    Mileage: 187538 km
    Time Indication: 0

    Freeze Frame
    RPM: 3113 /min
    Load: 9.4 %
    Speed: 90.0 km/h
    Temperature: 88.0°C
    Temperature: 34.0°C
    Absolute Pres.: 990.0 mbar
    Voltage: 13.716 V


    Readiness: 0000 0000

     
    0 0 0
     

  5. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #5
    Join Date
    Mar 2010
    Location
    Deerfield, NH, USA
    Posts
    18
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    This is going to require a diagnosis by someone who can look at the logs and determine what may cause this issue. And possibly someone who might suggest other parameters that it may be useful to log.

    After doing some additional research, I ran some more logs after adding in the lambda value. As you can see below, the lambda value suggests the power loss may be a direct result of genuine fuel starvation and not (as I wondered) as a result of the ECU killing power due to an erroneous (low) HP fuel sensor reading. The only other time you see such a lean reading is when the throttle is almost closed on overrun and no fuel is being thrown in. That said, the ECU is definitely reducing the throttle when compared to the actual pedal position (not in the log) so it may also shut off the injectors due to the low fuel pressure...? Who knows...? It's hard to draw a proper conclusion without a better working knowledge of the system.

    It's also worth mentioning, that the issue is intermittent and symptoms aren't necessarily consistent, i.e. the problem may or may not occur given seemingly identical circumstances. In addition, sometime the car jerks whereas other times it feels more like a limiter has been applied.


     
    0 0 0
     

  6. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #6
    Join Date
    Mar 2010
    Location
    Deerfield, NH, USA
    Posts
    18
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Still limping along with this issue. I've scoured the forums and seen many suggestions for some of my symptoms. I've seen a few people change the LP fuel sensor (thrust sensor), which has sorted their problems. In my case though, it seems that the LP side isn't the problem, the HP side is.

    I've been wondering if the HP fuel sensor may be at fault? My thinking being that the apparent fuel cut is simply the engine going into "limp mode" upon detection of apparent low HP fuel reading?

    Alternatively, I'm wondering if the fuel pressure relief valve is cracking open and pushing all the fuel back to the LP rail, effectively robbing the injectors of the pressure they need and slightly raising the LP rail fuel pressure (as seen in the logs)?

    I could just spend the money and throw parts at it, and believe me, at this stage of the game I'm tempted to do just that. Problem is, how much money do I waste before I drop a burning rag in the tank...?
    Last edited by betyouaint; 14-11-2014 at 02:13 AM.
     
    0 0 0
     

  7. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #7
    Join Date
    May 2007
    Posts
    1,131
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    17 Post(s)
    Just a thought, but is there a measuring block for checking the fuel temperature?
    If the ECU is seeing high fuel temp it may dump pressure from the rail to compensate for expansion. We all know how bad VW temp sensors can be.

    Just a thought.

    Jim.
     
    1 0 0
     

  8. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #8
    Join Date
    May 2007
    Location
    knee deep in clunge
    Posts
    6,170
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    14 Post(s)
    Firstly a drop in rail pressure due to blockage needs to be eliminated so you will find there is valve under the inlet manifold on the fuel rail, remove it and replace it as this has a gauze filter which blocks.

    https://www.google.co.uk/search?q=tf...%3B1600%3B1200

    Try to use a fuel pressure tester to calculate accurate pressure.
     
    0 0 0
     

  9. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #9
    Join Date
    Mar 2010
    Location
    Deerfield, NH, USA
    Posts
    18
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Quote Originally Posted by a8 tech View Post
    Firstly a drop in rail pressure due to blockage needs to be eliminated so you will find there is valve under the inlet manifold on the fuel rail, remove it and replace it as this has a gauze filter which blocks.

    Try to use a fuel pressure tester to calculate accurate pressure.

    From what I understand, this valve is a regulator which returns fuel from the HP rail to the LP side. If this was blocked then it would fail to return fuel to the LP side potentially resulting in excessive pressure on the HP rail, not a drop in pressure. The only way I see this valve being at fault is that it is opening (possibly due to excessive pressure) but opening too much and for too long, effectively dumping all the pressure to the LP side instead of "regulating the HP rail fuel pressure. Am I missing something?
     
    0 0 0
     

  10. Re: Power Loss & P2293 - Fuel Pressure Regulator Valve (N276): Mechanical Malfunction 
    #10
    Join Date
    Mar 2010
    Location
    Deerfield, NH, USA
    Posts
    18
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Based on a mix of ease of task, probability of part at fault and price of replacement part, I've decided that the HP fuel sensor shall be the first item to replaced...

    Fuel Pressure Sensor, 2.0T (0261545050)

    Next will be the FRV... and then the LP fuel pressure sensor.
     
    0 0 0
     

Page 1 of 3 123 LastLast

Similar Threads

  1. Please Help Power loss. Turbo or Fuel Regulator?
    By gttdi1985 in forum Golf MK5 - 2004 - 2009
    Replies: 6
    Last Post: 08-07-2014, 09:16 AM
  2. How To Poor fuel consumption & loss of power
    By vdubm0d in forum Audi A4 - B5 Forum - 1995 - 2002
    Replies: 3
    Last Post: 15-02-2011, 04:52 PM
  3. 17608 Boost Pressure Control Valve N240 Mechanical Malfunction
    By shabazmo in forum Audi A3 - Archive Topics
    Replies: 6
    Last Post: 31-01-2009, 06:46 PM
  4. Fuel Pressure Regulator
    By prokon in forum A6 - S6 - RS6 - - Archive Topics
    Replies: 0
    Last Post: 14-07-2008, 10:30 PM
  5. Passat loss of power & reduced fuel consumption
    By gerwyn42 in forum Passat - B5 Forum - 1997 -2005
    Replies: 11
    Last Post: 01-09-2007, 10:01 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


 



  


Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -