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boost issue

  1. Advice request G4 TDI

    VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum
    Hi all, just have a question if someone with diesel knowledge can maybe assist, golf 4 TDI ahf engine, engine recently replaced, running good just downpiped it yesterday sounds good! Now today I was driving a bit hard, engine was warm I heard a pop almost like a backfire and saw a black cloud of...
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