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How to test PCV valve? #4527159
09/26/17 09:58 PM
09/26/17 09:58 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
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?

Re: How to test PCV valve? [Re: Emanuel] #4527176
09/26/17 10:31 PM
09/26/17 10:31 PM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
It should be open when idling, it's a controlled air leak. Stuck shut is a problem, or guts gone.


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.
Re: How to test PCV valve? [Re: Silk] #4527184
09/26/17 10:43 PM
09/26/17 10:43 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
I think that itīs fine

Re: How to test PCV valve? [Re: Emanuel] #4527186
09/26/17 10:45 PM
09/26/17 10:45 PM
Joined: Nov 2011
Posts: 4,857
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,857
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.

Last edited by Rolla07; 09/26/17 10:46 PM.

2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: How to test PCV valve? [Re: Emanuel] #4527247
09/27/17 03:54 AM
09/27/17 03:54 AM
Joined: Jan 2011
Posts: 2,721
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,721
N.Ohio
Instead of sucking on the hose, do you have good vacuum from that hose when the engine is idling? You should.

Last edited by Lubener; 09/27/17 03:55 AM.

The "thinking" man's friend.
Re: How to test PCV valve? [Re: Emanuel] #4527261
09/27/17 04:56 AM
09/27/17 04:56 AM
Joined: Jul 2005
Posts: 30,449
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,449
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.


God Bless Our Troops

Re: How to test PCV valve? [Re: Emanuel] #4527410
09/27/17 09:28 AM
09/27/17 09:28 AM
Joined: Aug 2003
Posts: 10,788
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 10,788
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.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: How to test PCV valve? [Re: demarpaint] #4527433
09/27/17 10:03 AM
09/27/17 10:03 AM
Joined: Apr 2012
Posts: 3,159
Boston, MA
Bgallagher Offline
Bgallagher  Offline
Joined: Apr 2012
Posts: 3,159
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.


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: How to test PCV valve? [Re: Emanuel] #4527444
09/27/17 10:14 AM
09/27/17 10:14 AM
Joined: Jun 2015
Posts: 4,225
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,225
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...


2014 Forester XT, 86000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: How to test PCV valve? [Re: Emanuel] #4527474
09/27/17 11:05 AM
09/27/17 11:05 AM
Joined: Jul 2013
Posts: 353
D/FW Metroplex
The_Nuke Offline
The_Nuke  Offline
Joined: Jul 2013
Posts: 353
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.


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 2.62 (215mm)
Re: How to test PCV valve? [Re: demarpaint] #4527496
09/27/17 11:24 AM
09/27/17 11:24 AM
Joined: May 2012
Posts: 4,454
Baltimore, Maryland, USA
zzyzzx Offline
zzyzzx  Offline
Joined: May 2012
Posts: 4,454
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).

Re: How to test PCV valve? [Re: Emanuel] #4527882
09/27/17 07:44 PM
09/27/17 07:44 PM
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,755
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


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30
Re: How to test PCV valve? [Re: The_Nuke] #4527983
09/27/17 10:08 PM
09/27/17 10:08 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
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

Re: How to test PCV valve? [Re: Emanuel] #4528079
09/28/17 03:26 AM
09/28/17 03:26 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
You're supposed to be able to blow through one way, but not the other way.


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