D3...by "shroud" do you mean around the fan shroud? I would look to the water pump. The a/c compressor can make a knocking sound when going bad, try turning the a/c off while the engine is running and see if that helps. Could also be a belt tensioner. Other possibilities range from rod knock, main knock, oil pump, rocker arm/shaft... is it very loud, more of a high-pitched knocked/rattle sound, deep knock felt throughout the car...? Can you give a little more detail? Like when it started happening and under what conditions like hard acceleration, upon startup etc.
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