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Annoying rattle/tapping under acceleration

Discussion in 'A3/S3 Forum (8L Chassis)' started by jesters3, Jun 16, 2008.

  1. jesters3
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    jesters3 Active Member

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    Woe is me. I love my car.

    Audi S3 2002 BAM engine.

    She has decided to start making a tapping/rattling sound above 70 mph. It sounds like something metallic is brushing against something that is rotating (i.e a playing card hitting a bicycle wheel sound).

    Through the gears it is fine at low speed it is fine. It is just when I get to the 70mph mark does the sound come in. Under acceleration with full or partial the sound starts, foot off and the sound goes.

    1. I thought it was the Throttle body but that is all fine.
    2. Both fans seem to be fine and nothing is poking out to be caught
    3. I've had a good look around underneath the bonnet and with the car jacked up but can see nothing untoward.
    4. VAG.COM doesn't bring anything up
    5. Gave the exhaust, heatshield, CAT a good shake - but nothing

    I've trawled the internet and found various other makes of cars with a similar issue. Such as 'pinking', CAT clogged up and Timing Belt/Tensioner - are these easy to look at or check does anyone know?

    Anyone know of what else to have a look at before I take it to a garage.

    :keule:
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  2. Bobt
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    Bobt Member

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    Mine has started doing this randomly ! Have you found the cause of yours ???
    Same 2002 BAM engine
    #2
  3. jesters3
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    jesters3 Active Member

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    No still trying to find it.

    As far as I can hear it is low down at the base of the engine towards the back (though it is tough trying to listen whilst driving at 70 with your head down). I have been having a good look around when I can but cannot see anything loose or protruding. I need to get it up on a proper ramp. I'm thinking it could be a part of the heatshield come loose somewhere but it is proving a bugger to find. Will be jacking it up again tomorrow to have yet another look.
    #3
  4. mad max
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    mad max sixth gear

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    could be cam chain tensioner could also be piston ring
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  5. fingermouse
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    fingermouse thats me

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    this may not be right but didn`t I read something about a heat shield under the gear knob area that can rattle ??? May not be right but for some reason its just reared its head out of my foggy mind .....
    #5
  6. Bobt
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    Bobt Member

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    Mine is not a rattle likw a very heavy pinking !seem to have a loss of power when it happens ! could be me backing of when it happens but feels like power drops !
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  7. campbell
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    campbell Member

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    did you get this sorted and what was the problem?
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  8. jesters3
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    jesters3 Active Member

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    Haha just replied to you thread - have a look
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