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Thread: check valve 2.0 16v 9A

  1. #1

    check valve 2.0 16v 9A

    Hey guys!

    I have a problem with a vacuum leak on my 2.0 9A and when checking the vacuum hoses diagram I noticed that I am missing the check valve all together.

    There is just a hole to where the check valve hose should be.

    Could this be the reason why I have a high idle (1200rpm constantly and with no fluctuations)?

    2019-03-13_100434.jpg
    VW CORRADO 2.0 16v 9A

  2. #2
    ⋆⋆ CF Member ⋆⋆ vw rule's Avatar
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    9th February 2013
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    Hello there,

    I believe the euro spec or USA spec Corrado / Golf 16v engines had a EGR valve (n.o 28 and was bolted to the back of the inlet manifold, but all UK spec 16v engines as far as I'm aware don't have one, but you can sometimes see the moulded recess where the EGR valve would've gone.

    (N.0 11) In your photo is of the vacuum one way valve, that is fitted into the brake servo vacuum pipe, this reinforced plastic pipe runs from the brake servo to the back right of the inlet manifold.
    The 90 degree rubber hose (n.o 13) fits over a steel nozzle end, sticking out of the inlet manifold.
    If the servo pipe wasn't attached to your inlet manifold, then the engine would not start or it would run really badly and just cut out.

    Sometimes the steel nozzle end sticking out of the inlet manifold, can corrode and shear off leaving a hole, but you would hear a massive suction sound as the cylinders are sucking in air, plus the engine wouldn't run for long it would normally try to cut out.

    Idle control valve can play up causing erratic idle and engine cutting out.

    Brake servo pipe can split or the one way valve can split or fall apart, there should also be vacuum hose/s attached to the one way valve, again these can split or fall off.
    There should be 2 or 3 vacuum hoses attached or if only 2 then there should be a small green plug to seal up the none used 3rd vacuum inlet.

    Inlet manifold gaskets can leak as the manifold is in two half's, the 1.8 16v uses 50mm manifold with matching gaskets, and the 2.0 16v uses 42mm manifold with matching gaskets as standard.

    Throttle body gaskets can leak but it is rare.

    There should be a vacuum hose / pipe attached to the throttle body as well.

    The 45 degree inlet hose attached to front of throttle body can split, plus there should be 2 vacuum hoses attached to the underside of that 45 degree inlet hose.

    The large dome inlet boot on top of the fuel metering head can split also.

    Also if you spray some brake cleaner or carb cleaner or WD40 (remember to be careful of the exhaust manifold) if there is a vacuum leak the engine will change note, it'll normally try and speed up slightly for a few seconds.


    Hope this helps
    Si
    Last edited by vw rule; 2 Days Ago at 9:24 PM.
    Had MK2 Scirocco Scarla 1998 to 2002


    Now have Corrado 2.0 16v since 2002 still got it

  3. #3
    Thanks man, you sure know you're way around a corrado!

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