[ericbikes]

Hi- I have E39 and I get loud hissing left side of engine coming from bottom hose of this silver part that looks like some kind of vacuum part. Can someone pls identify? The loud leak sound seem like it's coming from wherever the hose goes down to that under the car I can't see what it's connecting to.

The loud leak sounding noise stops after about 60 seconds of starting cold engine and does not happen starting warm engine. Never happened before.