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  1. #1
    TanyaS3's Avatar
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    Intermittent Boost / Overboost

    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

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  3. #2
    Sandip's Avatar
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    Could be the N75 valve, dumpvalve or N249
    3.2 V6 with Custom Code VVT Attack Software


  4. #3
    TanyaS3's Avatar
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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
    Last edited by TanyaS3; 4th June 2009 at 12:41.

  5. #4
    S3 Paul's Avatar
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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 )
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  6. #5
    TanyaS3's Avatar
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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

  7. #6
    ianysm's Avatar
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    sounded like dv problem. This is at top of engine.
    Current: RenaultSport Clio 172
    Previous: 2001 ('51) S3 Quattro
    Previous: 2001 E46 M3 Coupe
    Previous: 2001 Civic Type R

  8. #7
    S3Steve's Avatar
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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.
    2007 A3 TDI 170 S Line
    Sold - 2002 S3

 

 

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