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Intermittent Boost / Overboost

TanyaS3 Jun 3, 2009

  1. TanyaS3

    TanyaS3 Member

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    Hello!

    Its been a while...... but I need some help please.............

    My S3 has a problem with intermittent boost. It will either not boost at all or massivley overboost to 25lb !!!!. Ocasionally it will boost normally. I also notice that the wastegate seems to chatter different amounts randomly (either a very small amount or fairly audible). The ambient temprature seems to make no difference. Has anyone else had this problem? Any help would be appreciated.

    Thanks
    Tanya
     
  2. Sandip

    Sandip Well-Known Member Team Nogaro Blue

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    Could be the N75 valve, dumpvalve or N249
     
  3. TanyaS3

    TanyaS3 Member

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    Thanks.

    I have spoken with Audi parts regarding the two valves. N75 and N249 seem to denote a number of different solenoid valves in the system. Is there anyway to figure out which valves I would need to replace ?. The car has been checked on with a diagnostic tool. The system displays : -

    01 - Engine electronics
    8N0 906 018
    1.8L R4 5VT
    Coding 5610

    value above maximum charge pressure

    Any info much appreciated
     
  4. S3 Paul

    S3 Paul Well-Known Member Regional Rep

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    Idealy you need to use vag com to check/ log the figures,
    Where abouts are you??
    I changed most of the control solanoids on my car ( it isnt cheap to just start changing things in hope )
     
  5. TanyaS3

    TanyaS3 Member

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    Hello, changed a part, I think N75 located at top of engine under cover and it all works fine and is holding boost nicely :)
    thanks for your help and advice
    Tanya
     
  6. ianysm

    ianysm Active Member

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    sounded like dv problem. This is at top of engine.
     
  7. S3Steve

    S3Steve Active Member

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    The N249 valve is the one ontop of the engine under the cover, the dv and N75 are both located on the tip.
     

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