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Flickering Rev-Needle on Idle

Discussion in 'A3/S3 Forum (8L Chassis)' started by Wizza, Apr 8, 2013.

  1. Wizza
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    Wizza BÜBENGRÖPEN

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    [Apr 8, 2013]
    This happens when both car is cold and warm but much more noticable when cold.

    Obviously the car starts as normal and revs to around 1200rpm but as it gradually drops the needle flickers between 700revs and 900revs - BUT - there seems to be no fluctuation in engine noise.

    Anyone any ideas and what exactly can cause this?
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  3. Wizza
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    Wizza BÜBENGRÖPEN

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    [Jun 30, 2013]
    Any ideas please?
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  4. Tim_Attard
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    Tim_Attard Active Member

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    [Jun 30, 2013]
    vac leak or maf would be my input
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  5. Scullies
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    Scullies Well-Known Member

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    [Jun 30, 2013]
    Yeah, me too. Try unplugging the maf and see how it idles.
    also worth doing a boost/vac leak test.
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  6. @udi A3
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    @udi A3 Site Sponsor Site Sponsor VCDS Map User

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    [Jun 30, 2013]
    no difference to engine tone? just a flikery needle, new cluster hunting time! Any other guages play up at all?
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  7. Wizza
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    Wizza BÜBENGRÖPEN

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    [Jul 1, 2013]
    ^^^Some of the leds behind the rev counter look dull... Also the LCD display is missing different lines every day but thats a normal for these cars.

    All other dials do seem fine.

    As regards to the vac leak - it may make sense as on the odd occasion the engine does jerk in low down gear change under slow acceleration.
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