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What’s this noise ??

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  • What’s this noise ??

    Any ideas ?
    Sounds top endy to me
    Doesn’t do it when stone cold but after a couple of minutes warm up.

    https://youtu.be/5q4UiepJmwU

    S2 Coupe 3B Project


    Ur quattro restoration

    S2 Avant

    Boost is the new rock and roll!
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  • #2
    Sounds like tappets or chain? But could be loose cambelt slapping against cambelt cover??

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    • #3
      Definitely sounds metallic
      It’s only there as the revs decrease
      Cambelt was done recently

      S2 Coupe 3B Project


      Ur quattro restoration

      S2 Avant

      Boost is the new rock and roll!
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      • #4
        Don't sound to good whatever it is bud better find out soon

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        • #5
          I would suspect tappets mate.

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          • #6
            How is your oil pressure? Difficult to say listening to sound recorded by a small device playing on a small device but I hate to say it but; knocking on overrun is a symptom of big end bearings.

            I hope you can tell me I'm wrong!

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            • #7
              Sorry, but not overly familiar with the turbo lumps, but does this one have a dumpy dizzy in it?

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              • #8
                Originally posted by steve briance
                How is your oil pressure? Difficult to say listening to sound recorded by a small device playing on a small device but I hate to say it but; knocking on overrun is a symptom of big end bearings.

                I hope you can tell me I'm wrong!
                Oil pressure is good, can’t hear it when driving either

                S2 Coupe 3B Project


                Ur quattro restoration

                S2 Avant

                Boost is the new rock and roll!
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                • #9
                  Originally posted by Bowie69
                  Sorry, but not overly familiar with the turbo lumps, but does this one have a dumpy dizzy in it?
                  It started life as a 3B so yes it’s got a dizzy but I’m only using the hall sensor signal as it’s now on coilpacks.

                  It might be play in the dizzy drive though, I will listen with a screwdriver

                  S2 Coupe 3B Project


                  Ur quattro restoration

                  S2 Avant

                  Boost is the new rock and roll!
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                  • #10
                    Yeah, that's what I was thinking... Sounded very familiar.

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                    • #11
                      If it wasnt there before fitting the cam belt then it's got to be relative to what's been removed & replaced. Check timing as well....

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                      • #12
                        Sounds like it could be a loose pulley. More rattle on overrun when tension comes off one of the belts?
                        The Perfectionist
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                        Audi Class Concours winner Stoner Park 2014, ADI Concours D'Elegance Class Winner 2008, Runner up 2014. Winner, S2Forum Show'n'Shine Billing 2006 & 2008.

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                        • #13
                          Had a listen with the ol “screwdriver stethoscope“
                          Really sounds like it’s inside the cam cover.

                          I don’t think it’s the dizzy as it’s not so loud listening near the back and I don’t have a loose plug. Think it might be a really bad hydraulic tappet.

                          S2 Coupe 3B Project


                          Ur quattro restoration

                          S2 Avant

                          Boost is the new rock and roll!
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                          • #14
                            Really hope it will be as simple as that .You could try fresh thicker oil .I have done it on my old 5cyl 10valve KV engine and it made the tappet quiet. You could try it for diag purpose

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                            • #15
                              "Oil pressure is good, can’t hear it when driving either" that's good then.

                              I've given up trying to get my distributor to be quiet, I've shimmed it so minimal play, fitted brass gear which helped a bit and neither stopped it completely. Does it more around 1700-2000rpm on the run down from revs. I guess wear on the cam gear may contribute but that's not easily sorted...

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