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Thread: s3 idling funny

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    s3 idling funny

    My s3 started idling weird tonight i drove about 8 miles and then was out car talking to someone then jumped in the turn round and noticed revs dropped down really slow then changing gear was getting backfire once home i took it out of gear and let it idle and its fluctuating between 2000 rpm and just below 1000rpm going up and down and if i rev it there is a back fire too any ideas? Got an ig maxogen fitted and full miltek turbo back exhaust

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  3. #2
    mjr901's Avatar
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    Quote Originally Posted by c6dsy View Post
    My s3 started idling weird tonight i drove about 8 miles and then was out car talking to someone then jumped in the turn round and noticed revs dropped down really slow then changing gear was getting backfire once home i took it out of gear and let it idle and its fluctuating between 2000 rpm and just below 1000rpm going up and down and if i rev it there is a back fire too any ideas? Got an ig maxogen fitted and full miltek turbo back exhaust
    you could try cleaning the MAF.
    2012 Ibis Black Edition S-tronic S3, 3 Door, Shark Stage 2, MTC Intake Kit, Powerflex Fast Road Dogbone Mount, Full Non Res Milltek Exhaust, Forge Development Intercooler + DV system,
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    where is it? and clean it with what?

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    Vacuum leak. Oil filler cap seal leak.

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    Quote Originally Posted by MrLapou View Post
    Vacuum leak. Oil filler cap seal leak.

    Cant seem to find any leaks but when I turn it off the circular plastic bit on front of rocker cover hisses away for a bit maybe 15 seconds it has a small hole that is meant to be there that's where air is coming from

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    s3 idling funny

    PVC valve common fault

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    Quote Originally Posted by 170sam View Post
    PVC valve common fault

    just replace that then see how it goes?

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    s3 idling funny

    My bad pcv valve

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    s3 idling funny

    Yea replace it I'm sure it will fix your issue

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    s3 idling funny

    Yea just replace it and I'm sure it will fix your issue for you .

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    Try taking cover off with engine running to see what happens.

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    Quote Originally Posted by MrLapou View Post
    Try taking cover off with engine running to see what happens.
    if i take oil cap off it runs worse then air hisses out valve at front i will try pcv valve

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    What is a PCV valve and what does it do????
    2009/2010 | Audi S3 Black Edition Ibis White | Black Optics Pack | Fully Loaded | S-Tronic

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    Quote Originally Posted by jaydav2306 View Post
    What is a PCV valve and what does it do????
    Its a valve on the front of rocker cover that takes breathers from block and inlet manifold and has a diaphragm in it to alow them all to breath, seems if diaphragm breaks air leaks straight to inlet causing idle to fluctuate

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    Is this the thing located on the top left hand corner above the oil cap? Good to know
    2009/2010 | Audi S3 Black Edition Ibis White | Black Optics Pack | Fully Loaded | S-Tronic

 

 

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