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Thread: "Knock" when revving, faulty DMF?

  1. #1
    ManuGD's Avatar
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    "Knock" when revving, faulty DMF?

    Hi all,

    One day a rotational knock appeared in my S3.
    It was very soft and I could only hear it when I start to roll in 1st gear (when clutch pedal is being released).

    I thought it was a clutch issue, but after a couple of months getting louder, now it knocks in every gear, clutch pedal pressed, not pressed, revving with no gear, accelerating... So I think my DMF is saying goodbye

    Here you have a video to hear what I'm talking about. It is the "knock-knock-knock" sound when I first rev up with no gear, and after that when I start rolling.

    LINK TO THE VIDEO [Dropbox]

    If I am right and I need to replace the DMF, what would you suggest?

    1- A new DMF?
    2- Or should I go with a single mass flywheel?

    Option 2 is way cheaper, but I don't know if there would be any cons. Would the gearbox and transmission system work fine?

    I don't want to save some money but then spend two times that amount to replace other broken/faulty parts...

    Anyone here running a single mass flywheel? I read lots of things in different forums but it seems that what works fine for some, doesn't for some others


    Thank you!

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  3. #2
    Alais DJA's Avatar
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    Does you get a knocking after you turn off the engine?

    550 cc Injectors / Milltek Exhaust Manifold

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  4. #3
    s3dave's Avatar
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    Quote Originally Posted by Alais DJA View Post
    Does you get a knocking after you turn off the engine?
    Ahh you think there is somebody in the boot?...
    Alex C and CHEZ like this.

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    Quote Originally Posted by Alais DJA View Post
    Does you get a knocking after you turn off the engine?
    No.

    Well, sometimes yes, but it has nothing to do with this knocking.

    This one knocks faster as you rev up.

    Someone can bring me any light?

    Thanks!

  6. #5
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    Guess what I drive...

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    Bent rod?
    16Klappe likes this.
    Silver 2002 Audi S3 225 (BAM) since March 2011.

    Mods: Badger5 2.2 TIP, Jetex filter, PCV delete, 710 DV, N249 bypass, R-Tech Stage 1 TiV Remap, Audi TT Pedals, Red Dogbone, Polybushed tie arms. All silicone boost pipes, Michelin PS3s, Red V6 coil packs, MK4 flat blade conversion, retrofited cruise control.
    Currently: 254bhp - 276lb/ft (174bhp/ton) as of 11/02/2013 On V-Power

  7. #6
    16Klappe's Avatar
    Certified S3 Slayer
    Crazy Closet Champion, Curveball Champion, Ping Champion, Snakeman Steve Champion, UFO Shoot Out Champion, Typing Test Champion, Smack the Rabbit Champion, Rabbit Hunter Champion, Mosquito Kill Champion, Mini KickUps Champion, KickUps Champion, Disc Dash Champion

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    Best reply ever Vex.

    Vex182 likes this.
    I quite often say I'm going to do things.

    Then never do them.

  8. #7
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    As far as I know DMF are installed only in Diesels.

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    Quote Originally Posted by myth View Post
    As far as I know DMF are installed only in Diesels.
    Thats a myth.... ; )
    Vex182 likes this.

  10. #9
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    Quote Originally Posted by Vex182 View Post
    Bent rod?
    In a stock car with only 116.000kms?
    Sounds strange, but I never thought about that possibility... And it scares me!

  11. #10
    16Klappe's Avatar
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    Quote Originally Posted by myth View Post
    As far as I know DMF are installed only in Diesels.
    Lol.
    I quite often say I'm going to do things.

    Then never do them.

 

 

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