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Strange rhythmic clunking/vibration

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Mollygoogle, Sep 16, 2013.

  1. Mollygoogle
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    Mollygoogle Member

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    [Sep 16, 2013]
    1.9 130. The car has been running absolutely fine until yesterday morning. When I started it up there was a strange vibration through the car, a rhythmic clunking and a rough idle. I didn't have time to look at it so left it until today.

    I checked the fluid levels which are fine. Fired it up. It now idles fine. I took it for a short drive and it drives fine. The clunking noise seems to match with the item boxed in yellow moving from side to side. Could just be a coincidence as I'm not that knowledgeable on engines and don't know what it is or whether it is supposed to be moving or not. Any ideas

    IMG_0514_zps602f5ec1.jpg
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  3. glenandem
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    glenandem Member

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    [Sep 16, 2013]
    Do a search for alternator clutch pulley, if your tensioner is bouncing about will probably be that!
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  4. Mollygoogle
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    Mollygoogle Member

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    [Sep 16, 2013]
    Thanks for that, I'll have a look about
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  5. Mollygoogle
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    Mollygoogle Member

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    [Sep 16, 2013]
    A quick look around on here and watch of vids, etc, shows that this is exactly what it is. Thanks for the heads up
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  6. glenandem
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    glenandem Member

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    [Sep 16, 2013]
    No probs, I did one on a passat a few years ago and the alternator is easy to get out but think you needed a multi splined socket if I remember right on the actual pulley!
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  7. Ian2012
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    Ian2012 Active Member

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    [Sep 17, 2013]
    You do and they are usually on f****n tight
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