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N249, No Boost, Audi S3, A3 S3

Discussion in 'A3/S3 Forum (8L Chassis)' started by doughty29, Dec 9, 2012.

  1. doughty29

    doughty29 Member

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  3. 16Klappe

    16Klappe I <3 Panda's!
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    Yes it would.

    No N75 = actuator pressure.
     
  4. Alex C

    Alex C Well-Known Member
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    he's cut the n249 valve off though
     
  5. 16Klappe

    16Klappe I <3 Panda's!
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    I believe he means the wires, and will have left the N75 valve in place itself?
     
  6. Alex C

    Alex C Well-Known Member
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    I think he has bypassed the N249 valve (looking at his other thread) but has also cut the electrical connection to the N249 valve and is awaiting a resistor to replace it with. I am assuming that the n75 is untouched?
     
  7. 16Klappe

    16Klappe I <3 Panda's!
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    What am I even thinking, a bit drunk and read N249 as N75. What a clutz. Sorry bro's, bad eyesight.
     
  8. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Just add i would t bother wiring a resistor in, its not needed and cause the ecu to fry from what ive read. The n249 fault code wont casue running issues, i get the same code every time i scan mate so i think you need to start looking elsewhere.
     
  9. doughty29

    doughty29 Member

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    cheers guys, basicly what happend is my N249 got caught up against the heat sheilding and caught fire! stupid mistake i know but i have been working in the dark with a head tourch. i have cut the wires off becuase i cant unplug it because the peice has melted itself together, i have no boost at all, ecu seems to be working, no odd things happening apart from the boost issue ( i know this because i unpugged my MAF and it came up with the engine light as normal) any ideas, i really need some help, i have tried everything. thanks.
     
    #8 doughty29, Dec 9, 2012
    Last edited: Dec 9, 2012
  10. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Youve checked the turbo havent you? You taken the silicone elbow off that connects to the charge pipe to see if its covered in oil?
     
  11. doughty29

    doughty29 Member

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    do you mean the induction hose? if so yes i have taken it off and looked, i checked it for play and to see if its seized, but didnt look for oil but im sure i would have noticed, cheers
     
  12. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Nonthe pipe that comes of the turbo and connects to the charge pipe (the metal L shaped pipe that goes around the top of the engine)
     
  13. doughty29

    doughty29 Member

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    oh right, yeah ive had that all off and havent noticed any more oil than normal
     
  14. doughty29

    doughty29 Member

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    what happend was i was driving my car after replacing the inlet hose because it was split, i found this due to no boost as im experiancing now, i unplugged my battery for 5 mins and then drove it, it was working for a minute or two, i noticed the power drop again... i then pulled over and found the N249 on fire! i havent had it running full boost since :/
     
  15. Dani_B19

    Dani_B19 Audi-sports own special child.

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    I wonder if the n249 wires are shorting some kind of signal out going tothe evc, didnt you say earlier that they are melted together?
     
  16. doughty29

    doughty29 Member

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    hmm il have another look, but they were melted together thats why i cut them apart, i will tape them apart properly and see if that does the trick..
     
  17. doughty29

    doughty29 Member

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    just taped it up and had a look up the wire and i can see any defects to the wire... any more ideas? haha
     
  18. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Haha im all out mate, youe tried everything, think is time for garage time and get a pressure test and also a compression test as well mate.
     
  19. doughty29

    doughty29 Member

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    yeah same here, im going to try the resistor tomorrow, and get it on my mates snap on diagnostics.. then to the garage.. ive heard it could be engine mounts or the fuel pump... cheers anyway
     
  20. doughty29

    doughty29 Member

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    Put the resistor on the N249 wires and still no luck, I may need to clear any faults on my ecu, but still no luck, anyone got any ideas?
     
  21. Alex C

    Alex C Well-Known Member
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    sorry silly question, but you have bypassed you N249 valve? and you have run a hose from the inlet to the top of the DV?

    also your TIP is definitely securely fitted?
     
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  23. doughty29

    doughty29 Member

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    yes and yes, booked into parsons performance now, just to check, which pipes go where into the N75 valve? cheers guys
     
  24. russwuss

    russwuss Active Member

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    I've just done the exact same... did you manage to find the root cause of your issue?

    My N249 melted on top of the manifold, now I'm only boosting to actuator pressure.

    Going to check codes in a min..
     
  25. russwuss

    russwuss Active Member

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    4 Faults Found:

    17956 - Boost Pressure Regulation Valve (N75)
    P1548 - 35-00 - Open Circuit
    17697 - Boost Pressure Control Valve (N249)
    P1289 - 35-10 - Short to Ground - Intermittent
    16396 - Bank 1: Camshaft A (Intake)
    P0012 - 35-10 - Advance Setpoint not Reached (Over-Retarded) - Intermittent
    17938 - Camshaft Timing Adjustment
    P1530 - 35-10 - Short to Ground - Intermittent

    Readiness: 0000 0000
     
  26. russwuss

    russwuss Active Member

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    N75 and Camshaft Sensor is plugged in... but looks like it's on the same circuit as the N249... Is there some sort of fuse or something that the melting N249 could have taken out?
     
  27. Machine212

    Machine212 Active Member

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    Try looking at fuse 34, middle row of big fuses, 4 up.
     
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  28. russwuss

    russwuss Active Member

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    34 = blown, new fuse fitted and car is now boosting fine - thanks!
     
  29. Machine212

    Machine212 Active Member

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    No problem, nothing better than an easy fix!
     

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