Chris NottVolks Autos
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  1. #1
    Reverse Gear

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    Join Date
    Mar 2011
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    3

    2.4 v6 idle hunting and hissing from petrol filler cap

    hello, firsat post i know, but just been busy with a few things as of late and will get a proper build thread on the go soon.

    But first, my 1998 a4 avant 2.4 v6 has a weird problem, when the car is running there is a constant hissing from the petrol filler cap, and for a short time after i have turned the car off. I have tried replacing the cap for a new one bu still the same??

    second thign is, when on idle, the idle will stay fine for a while then rev the engine and as it comes back down to idle it will hunt and nearly stall. Have cut out a few times as well when slowing down to say roundabouts when i dip the clutch.
    Am i right in thinking is will be more then likely the idle speed control valve??? or a vacuum pipe leaking??
    When its hunting, i can put my foot very lightly on the throttle pedal and feel that moving up and down abit.

    any help will be awsome!!!!!
    joel

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  3. #2
    "Stick a V8 in it!"

    Status
    Online
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    14,934
    Faulty tank vent valve i'd imagine.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


 

 

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