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  1. #1
    eddieantifreeze's Avatar
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    Diagnosing N75 problem.......

    I know, I know yet another question about N75 valves...... I am sorry

    My 1.8T (AGU) has been remapped and before map it ran fine and now after map it dumps all boost at around 5300rpm, this is only in third (not had a long enough stretch of road to try it in 4th) not in 1st or 2nd.

    I have changed the MAF, changed the DV to a forge 007p (with yellow spring).

    I stuck a fault scanner on it and the code that came up was 00575, Intake manifold pressure, sporadic - resulting limit not reached.

    I have done a search through the forum (before you tell me off) and I think it all points to the N75 valve, is their a method of diagnosing whether its knackered or not without buying a new one?

    Also I have not done the N249 bypass, would this affect the problem?


    Thanks Guys, sorry to be a pain
    97 Green 1.8T - Stage 1 R-Tech map - SOLD

    2001 B5 RS4 Avant - Misano Red - SOLD




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  3. #2
    <tuffty/>'s Avatar
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    Measure the duty cycle of the N75...

    00575 - Ross-Tech Wiki

    If this has happened after the mapping then I suggest you take it back to Nick are R-Tech to check out...

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

  4. #3
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    Or swap with somebody for 10 minutes, see how they're n75 valve is on your car. I had the same problem also.
    5 minute job swapping over

  5. #4
    eddieantifreeze's Avatar
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    Thanks guys - Ive had a little look and found one on the bay for £25 - bought it, see if it works, if not i know its a new part so it can be ruled out.....

    If it doesnt work.........R-Tech
    97 Green 1.8T - Stage 1 R-Tech map - SOLD

    2001 B5 RS4 Avant - Misano Red - SOLD




 

 

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