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    knocking noise in A4 TDI Engine

    I've got a 98 A4 B5 TDI (AHU 90bhp engine) with 70k on it. Just recently i hear the engine making a bit of knocking noise at idle, this is not consistent and happens immediately after start up, clears up for about a minute and then continues. The engine just doesn't sound as smooth. Any...
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