I have been searching like the dickens for why my 300 cd 617 has the air filter housing rattle!
As a side note... it did not rattle when I got the car a couple months ago, is was vibrationg bad at idle, and I changed engine shocks, shock mounts, shock bushings, and voila!

no more shake!
Well as any good DIY mechanic, (pun intended!) when fidling with a few things I noticed (actually I was cleaning the engine) when I pulled off the air filter housing, that one of the rubber mounts for the housing was broke in half

so I ordered new ones, and even though my car did not have them, I ordered heat shields for the rubber mounts. Put them all on and the filter housing started shaking and rattling!!! Drat, I pulled it back off, pulled the heat shields, reinstalled mounts...no avail still rattling By the way it rattles only at regular idle, little fuel...smooths right out. Also if the engine is sitting there running, I can push down on the housing...and no rattle. The engine is runing smooth as silk, but the rattle is annoying me. Please Help
Joe
82 300 CDT 125k