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S3 Problems

Discussion in 'A3/S3 Forum (8L Chassis)' started by psycosonic, Aug 9, 2009.

  1. psycosonic

    psycosonic New Member

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    Hello,

    My S3 ('03) is giving me some serious headaches..

    It fails a lot when i smash the accelerator, and giving me misfire problems in all cylinders. Already changed the sparks, DV, cleaned the TB, new fuel filter..

    I think the MAF is not ok either.. could the 4 coilpacks be mad?

    Bad coilpacks... bad MAF... ? The turbo only does about 0,3 bar boost..
    N75?

    Here are the vag-com results:

    5 Faults Found:
    17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
    P1297 - 35-00 - -
    16684 - Random/Multiple Cylinder Misfire Detected
    P0300 - 35-00 - -
    16688 - Cylinder 4 Misfire Detected
    P0304 - 35-00 - -
    16686 - Cylinder 2 Misfire Detected
    P0302 - 35-00 - -


    Thanks,

    Best regards,
    John M.
     
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  3. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Change all four coilpacks for geniune items and then take it from there also log you MAF readings and then that will give you an idea if thats out or not.
     
  4. psycosonic

    psycosonic New Member

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    Could the coilpacks influence the boost pressure? I'll start by changing the four coilpacks... thanks !
     
  5. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Have you checked all the main boost hoses and clips?
     
  6. psycosonic

    psycosonic New Member

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    Yep, they all seems to be OK. Are there differences between 1.9TDI PD 150hp MAF and 1.8T MAF ? At least the housing is the same.
     
  7. psycosonic

    psycosonic New Member

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    Hello again,

    New MAF, new coilpacks and new sparks. Cold start problem solved.
    The problem now is when the car starts to boost, when i smash the accelerator pedal, it fails. Like... hesitating.. if i don't smash the pedal, it runs fine.

    Starting to be sad... :(
     
  8. voorhees

    voorhees Moderator
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    remapped ?
     
  9. psycosonic

    psycosonic New Member

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    Stock file... already checked that.
     
  10. voorhees

    voorhees Moderator
    Staff Member Moderator Team Brill Red Black Edition

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    temp sensor ?
     
  11. golf

    golf ***** rent boy
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    I have the same kind of problem with mine, still unsolved.

    The turbo, N75, diverter valve, N249 valve and the MAF have all been changed by the previous owner. The problem is still there and the it's intermittent; sometimes the car will boost as normal and there'll be no problem but other times it's like driving a 1.8 NA at high revs until you change gear and the boost comes on. It's driving me mad!
     
  12. voorhees

    voorhees Moderator
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    I had the same problem thats why I have replied,overnite I still have a half second hiccup.
    must be another trait !?
     
  13. psycosonic

    psycosonic New Member

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    Now i've made a reset with vag-com (Engine module, adaptation, 00, save)... misfires started again... god!!!! :(
     
  14. psycosonic

    psycosonic New Member

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    What should be the requested boost? S3 1.8T 225hp... 1.1bar?
     
  15. psycosonic

    psycosonic New Member

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    Cold start problems are here again! Crank sensor? N75 could cause cold start problems?
     
  16. Pinola

    Pinola Member

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    how do you check if your car has been mapped or not?
     
  17. [Dave B]

    [Dave B] Daddy

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    Maybe it's time to stop 'smashing the accelerator'....? But more seriously I have no idea what it could be.

    Uselful, I know.
     
  18. psycosonic

    psycosonic New Member

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    I don't know if it has been remaped or not.. but i know that the ecu has the original file.

    News.... this happends after i do this at VAG-COM:

    Engine - Adaptation - Channel 00 - Read - Save... this should do a reset.
     
  19. psycosonic

    psycosonic New Member

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    The car doesn't misfire now.. but it only does 0,35bar boost.. when the ecu is requesting 0,85bar. N75?


    EDIT:

    Just found out this:

    [​IMG]
    [​IMG]


    But i don't know if the leak is that big..
     
    #18 psycosonic, Aug 17, 2009
    Last edited: Aug 17, 2009
  20. Broken Byzan

    Broken Byzan Photographic Moderator
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    SMIC top hose is leaking by the looks. Have you cleared the codes, as you could be in limp mode.
     
  21. psycosonic

    psycosonic New Member

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    Engine codes? It has no errors at the moment... so i made no clear.. :shrug:
     
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  23. Dani_B19

    Dani_B19 Audi-sports own special child.

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    That the drivers or passengers SMIC?
     
  24. psycosonic

    psycosonic New Member

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    Drivers. Leak fixed, problem still there. :(
     
  25. fran-s3

    fran-s3 Active Member
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    I had similar problems to this, my car would always missfire on full accelerator... Replaced MAF, sparks, coil packs etc... and checked VAG and looked for leaks.

    Turned out to be my fuel pump failing! It was fine when non-mapped, but it bough it out. Check to see if your car is running really hot after a run, I mean roasting under the bonnest as that's a classic symptom. VAG-COM won't show it, least it never did on mine! Worth checking, it drove me insanse! It'll be something mate, take it to a professional garage like I did. APS eventually found the problem after they to replaced every sensor under the sun.
     
  26. millwrx

    millwrx Member

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    as per last thread my one does the same will be checking the fuel pump,i have a new fuel pump but not sure if its the right one
     
  27. cabby86

    cabby86 Member

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    My car had the same problem when I purchased it, it turned out the car was mapped, which I wasn't aware of when I purchased it, had the standard map put back and I have not had any issues since. The specialist I took it to thought it might have been the coilpacks struggling with the extra power, but that was just a guess.

    Chris
     

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