PCV valve failure?

gavin_0108 · 09-05-2019, 12:24 AM

Hey all,
Went and got my oil changed today, the shop stated that the pcv valve has failed. Took it to another shop to take a quick look at it and they said that a failed pcv seems possible because the idle didn't change when you removed the oil cap. I was looking at the symptoms of a failed pcv valve (misfire, rough idle, sludge build up etc) and I'm not having any of those. Also I cant see why removing the oil cap would change the idle if it wasnt failed?

Is there something I'm missing here? As in regards to symptoms? Also is the pcv attached to the valve cover? The shop quoted 1600 because the valve cover needs to be replaced in order to change the pcv.

Car is a 2009 335xi 6speed manual

Thanks
- Gavin

Pladi · 09-05-2019, 06:15 AM

How much oil do you burn. ?

type-dRew · 09-05-2019, 09:58 AM

Find a shop you can trust that wont charge you 1600 for a valve cover change first off.

Second, yes it is possible that its dead @ 10 years old and unknown miles

TheMidnightNarwhal · 09-05-2019, 10:48 AM

Yes the factory valve is intergral to valve cover but Rob Beck sells a aftermarket PCV that is better for 40$. You just unscrew the cap of the valve cover and pop it out and pop the new one in and rescrew.

There is also a second "PCV valve", it's a breather hose with a flapper in it that connects from valve cover to intake tube.

I'm actually changing both of these in an attempt to hopefully fix my smoking and oil smell and refresh my PCV system.

I've heard people say regarding the oil cap thing, if you are smoking at idle and open the oil cap the smoking stops it means it's broken PCV. But you're not smoking right?

gavin_0108 · 09-05-2019, 11:16 AM

Quote:

Originally Posted by TheMidnightNarwhal

Yes the factory valve is intergral to valve cover but Rob Beck sells a aftermarket PCV that is better for 40$. You just unscrew the cap of the valve cover and pop it out and pop the new one in and rescrew.

There is also a second "PCV valve", it's a breather hose with a flapper in it that connects from valve cover to intake tube.

I'm actually changing both of these in an attempt to hopefully fix my smoking and oil smell and refresh my PCV system.

I've heard people say regarding the oil cap thing, if you are smoking at idle and open the oil cap the smoking stops it means it's broken PCV. But you're not smoking right?

The smoking doesn't stop if I take off the oil cap. I'll definitely look into that aftermarket pcv valve if it's only 40 bucks and install it anyhow though just for preventative maintenance

Quote:

Originally Posted by Pladi

How much oil do you burn. ?

None, or at least not noticable. I drove 700kms last weekend and my oil level didn't flinch.

Thanks all

TheMidnightNarwhal · 09-05-2019, 11:23 AM

Quote:

Originally Posted by gavin_0108

The smoking doesn't stop if I take off the oil cap. I'll definitely look into that aftermarket pcv valve if it's only 40 bucks and install it anyhow though just for preventative maintenance

None, or at least not noticable. I drove 700kms last weekend and my oil level didn't flinch.

Thanks all

Funny my exhaust reeks oil and I don't really loose to much oil either like you. I really hope my PCV components is gonna fix it and issue ain't my turbskies lol.

E92myes91 · 09-06-2019, 03:04 PM

Can this cause white smoke?

Denny347 · 09-06-2019, 07:26 PM

I had a mechanic tell me that a failing PCV system could also contribute to valve cover and oil pan gasket failure, excessive crankcase pressures.

nicsteez · 09-06-2019, 10:29 PM

Just get an aftermarket pcv valve. The stock plastic ones clog up and deteriorate over time. Only need to pop off cabin filter covers and engine cover to get to pvc valve. Unscrew 2 nuts for fuel line (don't be scared, tiny bit of fuel will come out so have a rag ready). Once the back fuel line is out of the way, unscrew the pcv valve cap. Next is to remove the pcv valve itself. These normally don't like to come out so you might need to grab something like a drill bit to put inside the end of the valve so you can get pliers or vice grips on it to pull it out. With new replacement, just transfer o-ring from old valve, push it in and re-install everything. Should fix your issues. You can find DIY tutorials on YouTube. Takes only about 10 minutes to do

09-05-2019, 12:24 AM	#1
gavin_0108 New Member 4 Rep 20 Posts Drives: 2009 BMW 335xi 6MT Join Date: Aug 2019 Location: Calgary, Alberta iTrader: (0)	PCV valve failure? Hey all, Went and got my oil changed today, the shop stated that the pcv valve has failed. Took it to another shop to take a quick look at it and they said that a failed pcv seems possible because the idle didn't change when you removed the oil cap. I was looking at the symptoms of a failed pcv valve (misfire, rough idle, sludge build up etc) and I'm not having any of those. Also I cant see why removing the oil cap would change the idle if it wasnt failed? Is there something I'm missing here? As in regards to symptoms? Also is the pcv attached to the valve cover? The shop quoted 1600 because the valve cover needs to be replaced in order to change the pcv. Car is a 2009 335xi 6speed manual Thanks - Gavin
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09-05-2019, 06:15 AM	#2
Pladi Lieutenant Colonel 718 Rep 1,753 Posts Drives: 2011 335i xdrive Join Date: Nov 2017 Location: Waterloo, ON Canada iTrader: (0)	How much oil do you burn. ?
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09-05-2019, 09:58 AM	#3
type-dRew Major 641 Rep 1,245 Posts Drives: 2009 335i xDrive Join Date: Feb 2019 Location: Newport MI iTrader: (0)	Find a shop you can trust that wont charge you 1600 for a valve cover change first off. Second, yes it is possible that its dead @ 10 years old and unknown miles __________________ 2009 335i xDrive AT / 177k+ miles PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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09-05-2019, 10:48 AM	#4
TheMidnightNarwhal Major General 2657 Rep 6,290 Posts Drives: 11' 335is DCT Join Date: Jun 2015 Location: Gatineau, Quebec iTrader: (0)	Yes the factory valve is intergral to valve cover but Rob Beck sells a aftermarket PCV that is better for 40$. You just unscrew the cap of the valve cover and pop it out and pop the new one in and rescrew. There is also a second "PCV valve", it's a breather hose with a flapper in it that connects from valve cover to intake tube. I'm actually changing both of these in an attempt to hopefully fix my smoking and oil smell and refresh my PCV system. I've heard people say regarding the oil cap thing, if you are smoking at idle and open the oil cap the smoking stops it means it's broken PCV. But you're not smoking right?
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09-06-2019, 03:04 PM	#7
E92myes91 Registered 0 Rep 2 Posts Drives: BMW 330ise Join Date: Sep 2019 Location: London iTrader: (0)	Help needed Can this cause white smoke?
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09-06-2019, 07:26 PM	#8
Denny347 Major 347 Rep 1,076 Posts Drives: 2008 M3 E90 Join Date: Aug 2010 Location: Indianapolis, IN iTrader: (0)	I had a mechanic tell me that a failing PCV system could also contribute to valve cover and oil pan gasket failure, excessive crankcase pressures.
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09-06-2019, 10:29 PM	#9
nicsteez Enlisted Member 10 Rep 43 Posts Drives: BMW 335i Join Date: Aug 2019 Location: Buffalo, NY iTrader: (0)	Just get an aftermarket pcv valve. The stock plastic ones clog up and deteriorate over time. Only need to pop off cabin filter covers and engine cover to get to pvc valve. Unscrew 2 nuts for fuel line (don't be scared, tiny bit of fuel will come out so have a rag ready). Once the back fuel line is out of the way, unscrew the pcv valve cap. Next is to remove the pcv valve itself. These normally don't like to come out so you might need to grab something like a drill bit to put inside the end of the valve so you can get pliers or vice grips on it to pull it out. With new replacement, just transfer o-ring from old valve, push it in and re-install everything. Should fix your issues. You can find DIY tutorials on YouTube. Takes only about 10 minutes to do
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