Can I leave this disconnected? How it works?
 

Hi everyone
I just find this line is sucking air.
Can I disconnect it and just leave there?
Is this side suck air into engine? Other side deliver air fuel oil to intake manifold?
Thanks

I'm not sure where it goes but it must be plugged if disconnected. It will pull unfiltered air into engine. Pretty sure it's for your brake booster though.

Sent from my ONEPLUS A5010 using Tapatalk

What are you changing out that you'd ask about it?

That is part of your PCV system. Do not leave it disconnected! If you want to redesign you PCV system with a catch can or AOS then do that. As stated above you will be getting unfiltered air into the intake system and also crankcase.

Yep, like ol @Grady said, that's part of the engines PCV (Positive Crankcase Ventilation) system. It's job is to ventilate the crankcase gasses (oil fumes) back into the intake system to be burnt by the combustion process. Why? So that the oil fumes created by blow-by (compressed gasses escaping past the oil and compression rings of the pistons) don't get exited directly into the atmosphere.

Back in the day, we didn't worry about that and just had a crankcase venting tube down along side of the engine block that vented to the open air. No problem unless you were "parking" on a cold, still, winter night and your girlfriend insisted on keeping the car running so the heater could keep the inside of the car warm, then it could get stinky in the cabin. And, that's all the excuse they needed to make you move on - :(

Wait a minute - what year is this? 2020! - ohhhhh, shit, I napped too long this time - :bonk:

Bye-bye - :sigh: