hose identification - crankcase PCV

6544 Views 21 Replies 4 Participants Last post by rio-t, Apr 21, 2020

justakiri

Discussion Starter · Apr 21, 2020

Hey guys!! I was replacing my valve cover gasket and broke a little part. I have no idea what it is called and was hoping for some help. This is a 99 Kia Sportage 4x4 with manual transmission. Thank you in advance. She is my daily driver so I need to get her "Mud" put back together asap!! ☺

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ron1004

· #4 · Apr 21, 2020

rio-t said:
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)

What about the PCV check valve?

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ron1004

· #7 · Apr 21, 2020

ron1004 said:
What about the PCV check valve?

justakiri said:
that's exactly what i did!! thank you soo much!!

The PCV check valve is a press-fit into the camshaft cover, the part that you pointed to - why go with a threaded barb, if you still need to fit the check valve?.

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ron1004

· #10 · Apr 21, 2020

MIA KIA 09 said:
Your arrow is pointing to the PCV VALVE and the rubber hose is the hose that connects vacuum air from the intake manifold to the valve, Left cracked or unhooked, it will cause idle rpm problems.

rio-t said:
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)

What makes you think natural aspirated engines don't use a PCV check valve?

one way valve = check valve = PCV valve

Google is your friend.

Crankcase ventilation system - Wikipedia

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ron1004

· #11 · Apr 21, 2020

rio-t said:
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)

That nipple (elbow) is the PCV

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ron1004

· #14 · Apr 21, 2020

rio-t said:
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?

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

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ron1004

· #20 · Apr 21, 2020

rio-t said:
I don't think I understand how it would cause lean condition, because it is metered air.

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.

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.

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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