On my 1984 W-123 OM617 .

Is it supposed to be closed when the engine is off ? .

I can't blow through it , by passing it makes the engine have way more power .

TIA ,

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better