My 1.8TQS, when turned off has a knock or rattle from the engine. It doesn't do it when the clutch is depressed. I thought it was gears knocking against each other in the gearbox, but could it be the DMF? It does it when warmed up, not if stopped while still cold. It sounds like the noise a failed rod bearing or knackered tappet makes. It's not got any worse in 3 years and about 30k.
