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Thread: 1.9 tdi 90 boost pressure sensor

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  1. 1.9 tdi 90 boost pressure sensor 
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    Hi guys noticed to day my boost pressure sensor is making a ticking noise on tick over and stops once it starts getting boost.

    Any one no why it's ticking?

    Can it be fixed or do I need a new one?

    The car doesn't feel any different to drive so don't think it's causeing any issue as of yet.
     
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  2. Re: 1.9 tdi 90 boost pressure sensor 
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    The boost pressure sensor on a 1Z is inside the ECU is is a virtually solid state passive part. Do you mean item 1 or 2?

    [IMG][/IMG]
    "I disapprove of what you say, but I will defend to the death your right to say it"

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  3. Re: 1.9 tdi 90 boost pressure sensor 
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    Sorry I'm new to these cars/engine

    Its number 1 on that pic
     
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  4. Re: 1.9 tdi 90 boost pressure sensor 
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    That is the N75 valve which controls the boost. This is a frequency modulator and opens and closes to control the position of the wastegate. I cannot remember how much they operate at idle, too long since I worked on one.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  5. Re: 1.9 tdi 90 boost pressure sensor 
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    Ok so probably best I get a new one then?
     
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  6. Re: 1.9 tdi 90 boost pressure sensor 
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    No! If it is operating the ECU is doing it.... It needs to be understood if it is being operated excessively or if it is completely normal.
    "I disapprove of what you say, but I will defend to the death your right to say it"

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  7. Re: 1.9 tdi 90 boost pressure sensor 
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    Sorry that don't makes sense to me, so do I keep it? Or bin it and run a manual boost controller?
     
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  8. Re: 1.9 tdi 90 boost pressure sensor 
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    No, just leave it alone! Is there a problem with the car?
    "I disapprove of what you say, but I will defend to the death your right to say it"

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  9. Re: 1.9 tdi 90 boost pressure sensor 
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    No issue at the moment, but the n75 valve is making a ticking noise at the moment
     
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  10. Re: 1.9 tdi 90 boost pressure sensor 
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    If it is ticking the cars engine computer is telling it to. The ticking is allowing a small amount of modulated vacuum to reach the turbo's wastegate actuator and will be keeping the flap of the wastegate slightly open at idle to keep the boost where the engineers wanted it to be. The way the N75 valve works means that it will tick and the frequency will vary according to where the wastegate flap needs to be for a particular running condition. I was working on a 2009 T5 2.5 TDI the other week and the N75 on that ticked all the time and there was no issue. Which year and engine code (1Z, AHU or ALE) is your car?
    "I disapprove of what you say, but I will defend to the death your right to say it"

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