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Intermittent Boost / Overboost

Discussion in 'A3/S3 Forum (8L Chassis)' started by TanyaS3, Jun 3, 2009.

  1. TanyaS3
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    TanyaS3 Member

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    [Jun 3, 2009]
    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
    #1
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  3. Sandip
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    Sandip Well-Known Member

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    [Jun 3, 2009]
    Could be the N75 valve, dumpvalve or N249
    #2
  4. TanyaS3
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    TanyaS3 Member

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    [Jun 4, 2009]
    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
    #3
  5. S3 Paul
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    S3 Paul Well-Known Member Regional Rep

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    [Jun 7, 2009]
    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 )
    #4
  6. TanyaS3
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    TanyaS3 Member

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    [Jun 24, 2009]
    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
    #5
  7. ianysm
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    ianysm Active Member

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    [Jun 25, 2009]
    sounded like dv problem. This is at top of engine.
    #6
  8. S3Steve
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    S3Steve Active Member

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    [Jun 26, 2009]
    The N249 valve is the one ontop of the engine under the cover, the dv and N75 are both located on the tip.
    #7

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