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S3 knocking sound coming from engine - pls help - getting worried.....

Denty Nov 9, 2011

  1. Denty

    Denty Active Member

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    Hello people, hope ur all well.

    My 08 S3 has developed a knocking sound from the engine bay when you pullaway from a standstill or if your in neutral and rev it.

    About 2 seconds after you rev the engine it knocks once and only once. It does this if your stationary with the car in neutral, clutch up or down. Its only ever one knock, like i said, it happens after a couple of seconds after initial take up or revving. It seems to get a bit louder the higher i rev it but its only ever one knock....

    Any ideas as im getting para the engine is gonn blow up etc...

    Looking forward to your reply guys

    Cheers:thumbsup:
     
  2. S3Alex

    S3Alex Rarely neutral Team Ibis TFSI Owners Group Gold Supporter Audi S3 DSG

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    Possibly the DMF is knackered,as it's the only thing I can think of that would do something like that....certainly needs someone to look at it.
     
  3. Denty

    Denty Active Member

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    I had the clutch replace at APS and they said my DMF was fine so...... cheers anyway mate
     
  4. Denty

    Denty Active Member

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    ANY OTHER IDEAS??
     
  5. S3Alex

    S3Alex Rarely neutral Team Ibis TFSI Owners Group Gold Supporter Audi S3 DSG

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    Did they replace the DMF at the same time?

    This seems to be what most recommend,but good luck in getting to the bottom of this.
     
  6. Denty

    Denty Active Member

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    No they said the DMF was fine with little or no movement so they just cleaned the face of it....

    Ive been looking on the forums but this seems like a new one if its not DMF related.

    Me thinks im gonna be buying a mechanics stethascope to try and figure out exactly where its coming from....:doctor:


    any other suggestions welcome
     
  7. One Spoke

    One Spoke Member

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    Engine mount?
     
  8. leach76

    leach76 Member

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    My thoughts also or dog bone mount etc
     
  9. Denty

    Denty Active Member

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    well i think ive figured out what the 'knocking' was - it seems to be coming from my twintakes wing side airfilter.... had a quick look and it had some leaves and stuff inside, gave it a quick clean and all seems ok now!:thumbsup:

    Its mad how the noise was amplified so much, up thru the car and sounded like it was the engine ..... relieved now tho.
     
  10. warren_S5

    warren_S5 Moderator Moderator VCDS Map User

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    Bizarre, but when I fitted my ITG intake it amplified the sounds of the HPFP running so you could hear it ticking at above 6000rpm. Ended up fitting acrylic washers between the main mounting points to the engine block and the metal washers to quieten it down.
     
  11. Denty

    Denty Active Member

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    yea it was a funny one, had me worried for a few days i tell ya! good one making your less noisy warren, nice tip.

    Think im gonna gold tape wrap mine next...then fit a twincooler when funds allow....:yes:
     
  12. Denty

    Denty Active Member

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    ok ok, I thought it was the twintake making the singular knocking noise when pulling away - turns out it wasnt, it was the dump valve/dump valve hose.... when i pinch the hose with some lockable pliers it stops knocking..... the pipe was deforming and causing some sort of vacume thing - got a new uprated forge silicon hose on the way now:cool:
     

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