hose identification - crankcase PCV

yes crank case ventilation. tap it, put a threaded barb on it, and reattach the vacuum line (if you broke the nipple off the valve cover)

yea you need a vac line pcv that just goes on a vac line it's just a one way valve. Maybe ron can enlighten me as to why you need one on a non turbo car (because the intake manifold is always vaccum) (not a evap purge valve ron, but a pcv)

ron1004 said:

That nipple (elbow) is the PCV

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I understand what it dose friend, what I don't understand is why it would ever need to be closed. The need for a one way valve in a turbo car is because under boost the manifold is positive pressure, and you don't want to push that air into the crank case, so there is a NEED for a one way valve (one pull no push). That isn't the case on an NA car. I have seen plenty of people retap the pcv thread for a larger line and delete the valve alltogether. Why would that be an issue?

MIA KIA 09 said:

I understood that from your first post and responded correctly to you. I think member rio-t was on the same thought but was suggesting a cheap fix verses just replacing the PCV Valve itself. It is NOT "just a one way valve" but a metered opening also to not draw off too much vacuum of the running motor.
Yes replace the PCV Valve and all should be good to finish your maintenance task with your ride.

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I was unaware too much vacuum could occur. But tbh the cars I've seen delete the valve are road race cars always running at high rpm (where you want as much evacuation as possible, hints the tapping to a larger diameter) I could see how you could suck too much oil for regular use tho, thank you for the reply as always

ron1004 said:

At idle, the manifold vacuum is high, which would draw in a large quantity of crankcase gases, causing the engine to run too lean. The PCV valve closes when the manifold vacuum is high, restricting the quantity of crankcase gases entering the intake system.[9]

Crankcase ventilation system - Wikipedia

en.wikipedia.org

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I don't think I understand how it would cause lean condition, because it is metered air. but hey, I thought vacuum increased with revs so maybe I'm just dumb. My thought was more revs = more vacuum = less crank case pressure. My understanding is ideally crank case pressure would always be under vacuum.

MIA KIA 09 said:

Nothing like HIJACKING an already well taken care of thread. This is NOT helpful to the original poster or others that may come searching for the same original problem later. Take this theory debate to a new thread in the off topic page.

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seemed relevant to the pcv to me, which was half the thread

ron1004 said:

Air entering the intake manifold through the PCV system is unmetered because its after the MAF, but on models that use MAP's it would not be an issue.

Visualize at idle the pistons on their intake stroke are sucking air against a closed throttle butterfly causing high vacuum in the intake manifold, and with wide open throttle the intake manifold will be at atmospheric pressure.

The intent is to keep just a slight vacuum on the crankcase.

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Didn't think the flap was closed that tight myself, but I appreciate your response, nor did I think about the MAF MAP. Always appreciate understanding the systems in depth.