Grommet in air filter lid - 190 2.6

[john493]

Guys,
There's an open grommet in the air filter lid of my 2.6- see pic, it's just behind the MB logo.
Is there supposed to be something plugged into it ? If not, it's letting unfiltered air into the engine !

 

[type49]

No. That's where the CO/mixture is adjusted from.