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Turbo / Boost Leak??

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Chrisd1983, Mar 27, 2013.

  1. Chrisd1983
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    Chrisd1983 Member

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    [Mar 27, 2013]
    Morning,

    Just been driving my B7 2.0 Tdi 140 to work this morning, and sat cruising in 6th gear to suddenly find no boost / turbo, so dropped it down to 5th and still the same.....after a while I had boost again?! This repeated itself again before I got here, once the boost returned the second time I gave it a thrash in 3rd / 4th and all seems fine.........

    Any ideas what might have caused this intermittent fault? If it was a boost pipe, I thought I would not have any boost full stop and heard a boost pipe come off?

    Cheers,

    Chris
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  3. Molnboman
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    Molnboman Well-Known Member

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    [Mar 27, 2013]
    I would have thought only a diagnostic check would reveal possible reasons for that.

    Good Luck
    A
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  4. Chrisd1983
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    Chrisd1983 Member

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    [Mar 27, 2013]
    Just checked all boost pipes and everything is fine. I had the EGR mapped out a while ago, so I know its not that.

    If it was an overboost problem, the car would go into limp mode and display a CEL on the dash wouldnt it?
    #3
  5. wyliss
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    wyliss Member

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    [Mar 27, 2013]
    The divertor valve is prone to leaking. The rubber gasket perishes over time. Once replaced its like a new car again. The parts only about £40.
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  6. Chrisd1983
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    Chrisd1983 Member

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    [Mar 27, 2013]
    Its a Tdi mate, I'm pretty sure diverter valves aren't fitted to diesels. Cheers though
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  7. Chrisd1983
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    Chrisd1983 Member

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    [Apr 8, 2013]
    Well I gave this a scan and this is what has come up??

    EGR valve malfunction-N18

    Potentiometer for EGR-G212 signal too large

    My EGR was mapped out last year sometime, so I believe its something to do with the N18 solenoid valve, possibly an intermittent fault on this affecting the vacuum??
    #6

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