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#4527159 - 09/26/17 09:58 PM How to test PCV valve?
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: Venezuela, South America
My car is burning 0.8 qt of oil every 1k miles, I have checked the PCV valve, it isnīt blocked or dirty, I can hear a sound when I shake it which tells me that is in good condition. I can suck from the Intake Manifold very easily, Shouldnīt it require some vacuum pressure to open? And I can also apply pressure with my mouth from the intake manifold side and the air can pass the PCV valve but slowly.

The car is idling at 800 rpm which convinces me that the PCV valve isnīt stuck open.

What do you think?

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#4527176 - 09/26/17 10:31 PM Re: How to test PCV valve? [Re: Emanuel]
Silk Offline


Registered: 07/26/03
Posts: 4552
Loc: New Zealand
It should be open when idling, it's a controlled air leak. Stuck shut is a problem, or guts gone.
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1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.

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#4527184 - 09/26/17 10:43 PM Re: How to test PCV valve? [Re: Silk]
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: Venezuela, South America
I think that itīs fine

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#4527186 - 09/26/17 10:45 PM Re: How to test PCV valve? [Re: Emanuel]
Rolla07 Offline


Registered: 11/05/11
Posts: 4732
Loc: MTL, CANADA
If its cheap to replace where you are just replace it. They are about 10$ here (less in USA). Worst case you are out some cash. Mine seemed normal but once replaced the slight oil usage stopped. Seems like a good amount of consumption though.


Edited by Rolla07 (09/26/17 10:46 PM)
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#4527247 - 09/27/17 03:54 AM Re: How to test PCV valve? [Re: Emanuel]
Lubener Offline


Registered: 01/22/11
Posts: 2576
Loc: N.Ohio
Instead of sucking on the hose, do you have good vacuum from that hose when the engine is idling? You should.


Edited by Lubener (09/27/17 03:55 AM)
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#4527261 - 09/27/17 04:56 AM Re: How to test PCV valve? [Re: Emanuel]
demarpaint Offline


Registered: 07/03/05
Posts: 29743
Loc: NY
If you do replace it, I would go with an OE part. I learned the hard way that the only way to go with a PCV valve is OE.
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#4527410 - 09/27/17 09:28 AM Re: How to test PCV valve? [Re: Emanuel]
JTK Offline


Registered: 08/14/03
Posts: 10559
Loc: Buffalo, NY
They're just a check valve. Flow should only go one way, towards the intake manifold. During periods of slight positive crankcase pressure (wide open throttle, etc), the valve should close.
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#4527433 - 09/27/17 10:03 AM Re: How to test PCV valve? [Re: demarpaint]
Bgallagher Offline


Registered: 04/17/12
Posts: 3159
Loc: Boston, MA
Originally Posted By: demarpaint
If you do replace it, I would go with an OE part. I learned the hard way that the only way to go with a PCV valve is OE.


+1 OE is a good way to go. I would replace it anyways. It traditionally isn't an expensive part.
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#4527444 - 09/27/17 10:14 AM Re: How to test PCV valve? [Re: Emanuel]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3966
Loc: New England
I just bought a Subaru OEM PCV for my FXT and it was $8 before shipping.
The bad thing is that I have to pop the intercooler off to get to it...this is the reason a local dealer totally blew off replacing it at my 60kmile service after I had been assured on the phone that it would be done. They pointed to an "if applicable" line in their standard paperwork for the service, I was stupid enough to read this as meaning if the vehicle had one and not if the techs felt like doing it. Gotta get this stuff in writing when dealing with shady dealerships...
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#4527474 - 09/27/17 11:05 AM Re: How to test PCV valve? [Re: Emanuel]
The_Nuke Offline


Registered: 07/21/13
Posts: 288
Loc: D/FW Metroplex
An oil with a lower NOACK value should slow that oil consumption rate, or switching to a 10W-30 (assuminb you're running 5W-30 now) will prob help.
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#4527496 - 09/27/17 11:24 AM Re: How to test PCV valve? [Re: demarpaint]
zzyzzx Offline


Registered: 05/18/12
Posts: 4357
Loc: Baltimore, Maryland, USA
Originally Posted By: demarpaint
If you do replace it, I would go with an OE part. I learned the hard way that the only way to go with a PCV valve is OE.


I agree. I hate using plastic parts, but I replaced a metal aftermarket PCV valve with a plastic Motorcraft PCV valve, and my car idles better. The difference is that the aftermarket PCV valves seem to let some air both ways, so it's like having a vacuum leak. The OE one only let air in one direction. Still cheap enough too (Motorcraft part bought off eBay, or Amazon).

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#4527882 - 09/27/17 07:44 PM Re: How to test PCV valve? [Re: Emanuel]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1657
Loc: Crawfordville FL
Originally Posted By: Emanuel
My car is burning 0.8 qt of oil every 1k miles, I have checked the PCV valve, it isnīt blocked or dirty, I can hear a sound when I shake it which tells me that is in good condition. I can suck from the Intake Manifold very easily, Shouldnīt it require some vacuum pressure to open? And I can also apply pressure with my mouth from the intake manifold side and the air can pass the PCV valve but slowly.

The car is idling at 800 rpm which convinces me that the PCV valve isnīt stuck open.

What do you think?


The spring can fatigue and cause it to pass too much flow. This can contribute to consumption. Replace it and monitor oil level

My car was up to about a qt in 2k mi. I changed the PCV and now I'm
Back to about a qt every 6k mi
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#4527983 - 09/27/17 10:08 PM Re: How to test PCV valve? [Re: The_Nuke]
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: Venezuela, South America
Originally Posted By: The_Nuke
An oil with a lower NOACK value should slow that oil consumption rate, or switching to a 10W-30 (assuminb you're running 5W-30 now) will prob help.


Iīm currently using a 15w40 HDEO

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#4528079 - 09/28/17 03:26 AM Re: How to test PCV valve? [Re: Emanuel]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
You're supposed to be able to blow through one way, but not the other way.

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