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thumping noise and air blowing out from inlet?

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by K61187, Apr 16, 2012.

  1. K61187

    K61187 New Member

    Mar 6, 2012
    2006 A4 TDI 2.0
    Hi guys ive got a mk4 gti tdi 150bhp 2003.... iv gathered that the cam and tappets are not brilliant on these but mine is blowing air out of the inlet and that is the thumping like noise...

    i could here the thumping noise from the air box then removed the rubber boost pipe to the intake also the EGR so now the engine is running without the turbo and that's where the noise is coming from but why is it blowing air out when it should have an induction to air?

    any help and advice would be gratefully appreciated guys.... :)
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  2. chittychittybangbang

    chittychittybangbang Administrator

    May 23, 2007
    2006 Jetta TDI
    because the cam is worn and intake air is bouncing out.

    Check out the FAQ for videos of worn cams, I'll bet yours sounds the same.

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