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  1. #1
    Westy's Avatar
    Double Dark Side! Diesel & 8P

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    Possible faulty N75, how do I diagnose?

    I have no errors in VCDS but my car has been doing some strange things boost wise recently!

    Firstly I have had a strange fluttering noise since I first bought the car and it only does it when the engine is cold then it goes away when warm. And secondly my turbo has been getting louder as if the boost has been turned up and its spooling faster than normal!

    Is there any real way to diagnose the N75 valve? I seem to remember reading something about being able to log the N75 in VCDS and be able to see when its working?

    Any help appreciated guys.
    8P A3 TDI - 220bhp - 335lbft
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  3. #2
    s3dave's Avatar
    TFSI Hybrid

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    not sure how to check but ive got a liquid guage that can monitor the n75 and it bounces all over the place so i wonder if mine is fooked too

  4. #3
    <tuffty/>'s Avatar
    Badger 5 Edition

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    Block 114 shows N75 duty cycle I think, will hit 90 odd percent while controlling initial onset of boost then settle... if its working ok it will stay more or less at the same figure after initial spike...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  5. #4
    Westy's Avatar
    Double Dark Side! Diesel & 8P

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    Cheers tuffty I'll give this a wirl.
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
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  6. #5
    RIP S3dave

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    block 118 shows n75 duty cycle and actual boost, so combined with 115 block you can see it go to 95% initially to provoke spool then wind back to achive the requested boost
    in main engine setting, you can also exercise the solenoids including the n75 one (click click)

    only way to confirm if yours is on the fritz is swapping it for a known working one and seeing if there's a difference (what I do)
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  7. #6
    <tuffty/>'s Avatar
    Badger 5 Edition

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    What he said

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  8. #7
    Westy's Avatar
    Double Dark Side! Diesel & 8P

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    Quote Originally Posted by tufftybloke View Post
    What he said

    <tuffty/>
    You talk a good game mate
    8P A3 TDI - 220bhp - 335lbft
    A3 Maintenance Thread
    Bye bye S3 you will be missed.
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