On our 89 190e, theres a grommetted hole in the middle of the air filter housing. it goes through the bottom and gives access to some sort of set screw (on the throttle body?) does anyone know what this is for and what is missing? it doesn't seem right that the air that travels through there does not get filtered.
thanks all!

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German autos!!!
'67 250se coupe
'89 190e 2.6
'05 BMW x5
'59 0319 diesel Omnibus.
Italian bikes!!!
'64 Lambretta Special 185 hot rod scooter
'66 Lambretta SX200
'59 Lambretta 250 race bike
'70 Lambretta GP200
'77 860gt ducati
'66 ducati monza