Testing pcv system out

Asps91 · 10-20-2015, 05:19 AM

Hi guys, as a test if you remove the line from the pcv going to the air intake and feed it into a glass jar could you perhaps diagnose if the pcv is expelling large amounts of oil into the intake due to something going bad in the pcv system? Is there a better way to test it?

Asps91 · 10-20-2015, 06:34 PM

Please help

JDuke335i · 10-20-2015, 07:33 PM

Quote:

Originally Posted by Asps91

Hi guys, as a test if you remove the line from the pcv going to the air intake and feed it into a glass jar could you perhaps diagnose if the pcv is expelling large amounts of oil into the intake due to something going bad in the pcv system? Is there a better way to test it?

The system is pressurized so that wouldn't work. U should order an Occ ( oil catch can ). Maybe someone else will chime in with a test you can do now to check it

TrollToll · 10-20-2015, 07:35 PM

There aren't many parts that can go wrong in the pcv system. The valve is cheap and fairly easy to replace and I believe one of the lines has a check valve. There are passages in the valve cover that can clog but they don't often cause problems.

Asps91 · 10-20-2015, 07:45 PM

Long story short im having bad smoke on deceleration. I had the valve cover and the pcv replaced yesterday to no avail. When I asked the mechanic if they tested the internal pcv components they seemed very hesitant with my questions which leads me to believe they checked nothing inside the valve cover. Before I go to the next step and replace turbos, valve seals ect I want to make sure 100% im not getting excessive blow into the intake on deceleration.

BeastMode335i · 10-20-2015, 10:02 PM

Quote:

Originally Posted by Asps91

Long story short im having bad smoke on deceleration. I had the valve cover and the pcv replaced yesterday to no avail. When I asked the mechanic if they tested the internal pcv components they seemed very hesitant with my questions which leads me to believe they checked nothing inside the valve cover. Before I go to the next step and replace turbos, valve seals ect I want to make sure 100% im not getting excessive blow into the intake on deceleration.

If the valve cover and pcv were replaced, that's really all there is to the PCV system besides the check valve hose and the small ports in the head..

Asps91 · 10-20-2015, 10:09 PM

is the check valve hose accessible without disassembly of the valve cover? I cant seem to find any diy's online.

TrollToll · 10-20-2015, 10:22 PM

Quote:

Originally Posted by Asps91

is the check valve hose accessible without disassembly of the valve cover? I cant seem to find any diy's online.

I think it's behind the valve cover going to the rear inlet

Turbo_power4ever · 10-21-2015, 12:28 AM

Quote:

Originally Posted by Asps91

is the check valve hose accessible without disassembly of the valve cover? I cant seem to find any diy's online.

This might help? Valve cover does not have to come off. Just engine cover

Turbo_power4ever · 10-21-2015, 12:30 AM

Wow, dont know why the text got so blurry in that screen shot. Thats is from burgertuning oil catch can install guide

Asps91 · 10-21-2015, 07:05 AM

Thanks guys, I'm going to pull it of this Friday and inspect it. Not sure if I can be tested. If it looks suspect I will just replace it

Wolf 335 · 10-21-2015, 08:13 AM

The check valve hose or pcv hose is accessible from the top rear after removing the engine cover (no need to remove the valve cover).

Careful no to break the tabs that hold the hose clipped in.

Once removed, start to flip the hose up/down and you should hear the valve flapping inside.

I was told by the dealership that my pcv valve and hose was blocked and needed to be replaced. So I ended up ordering the Rob Beck metal pcv valve and bought the oem hose.

After removing the pcv valve it seemed a bit sluggish, but I thoroughly sprayed brake cleaner into it and it was flapping around like new (at this point the valve had some damage from the pliers I used to remove it so I didn't bother putting it back on). I did the same with the pcv hose although mine seemed fine. I ended up taking an x-ray image of the pcv valve to see what's going on in there. Not much to it really. If you can manage to remove the valve without damaging it, you could potentially clean it up with brake cleaner and put it back on.

Cheers

mojobmw_e90 · 10-21-2015, 08:30 AM

Our cars have 2 check valves. One is that plastic tube and the other is the actual pcv that's underneath the fuel line that needs to be unscrewed. If your mechanic did replace the valve cover, and did use rtv around the edges, make sure that it didn't seal or cover the ports on the head that need to be left open for the engine to breath.

I did a friend's valve cover after he took it to a shop for smoking and when he brought it to me I found the ports blocked off due to using to much rtv. Now he is smoke free

MachWon · 10-21-2015, 08:30 AM

At the end of my check valve, there is a tiny filter (previous owner's doing). When I pulled it off, it was extremely oily. Like, the inside was black with oil.

I'm also getting smoke on deceleration and bad oil smell. Bad PCV system for me?

Asps91 · 10-21-2015, 07:37 PM

Quote:

Originally Posted by mojobmw_e90

Our cars have 2 check valves. One is that plastic tube and the other is the actual pcv that's underneath the fuel line that needs to be unscrewed. If your mechanic did replace the valve cover, and did use rtv around the edges, make sure that it didn't seal or cover the ports on the head that need to be left open for the engine to breath.

I did a friend's valve cover after he took it to a shop for smoking and when he brought it to me I found the ports blocked off due to using to much rtv. Now he is smoke free

I guess that could be an issue however the car was smoking in the same manner on deceleration even before th pcv and valve cover were done. It the flapper is ok, my next bet is the turbos.

sk55 · 10-22-2015, 11:24 PM

Quote:

Originally Posted by Asps91

Long story short im having bad smoke on deceleration. I had the valve cover and the pcv replaced yesterday to no avail. When I asked the mechanic if they tested the internal pcv components they seemed very hesitant with my questions which leads me to believe they checked nothing inside the valve cover. Before I go to the next step and replace turbos, valve seals ect I want to make sure 100% im not getting excessive blow into the intake on deceleration.

Take Pcv Jose out vent to air. Cap other end off see if the smoke stops.

I think u can also pull out the vacuum hose from the vac canister. That should reduce your boost to zero. See if it smokes. Just remember what hose goes to what canister.

Asps91 · 10-27-2015, 08:16 PM

Does anyone know if there is any other way oil can enter the combustion chamber?

10-20-2015, 05:19 AM	#1
Asps91 First Lieutenant 39 Rep 364 Posts Drives: Bmw 335i Join Date: Sep 2014 Location: Sydney iTrader: (0)	Testing pcv system out Hi guys, as a test if you remove the line from the pcv going to the air intake and feed it into a glass jar could you perhaps diagnose if the pcv is expelling large amounts of oil into the intake due to something going bad in the pcv system? Is there a better way to test it?
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10-20-2015, 06:34 PM	#2
Asps91 First Lieutenant 39 Rep 364 Posts Drives: Bmw 335i Join Date: Sep 2014 Location: Sydney iTrader: (0)	Please help
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10-20-2015, 07:35 PM	#4
TrollToll Banned 654 Rep 946 Posts Drives: 535i Join Date: Sep 2015 Location: Texas iTrader: (0)	There aren't many parts that can go wrong in the pcv system. The valve is cheap and fairly easy to replace and I believe one of the lines has a check valve. There are passages in the valve cover that can clog but they don't often cause problems.
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10-20-2015, 07:45 PM	#5
Asps91 First Lieutenant 39 Rep 364 Posts Drives: Bmw 335i Join Date: Sep 2014 Location: Sydney iTrader: (0)	Long story short im having bad smoke on deceleration. I had the valve cover and the pcv replaced yesterday to no avail. When I asked the mechanic if they tested the internal pcv components they seemed very hesitant with my questions which leads me to believe they checked nothing inside the valve cover. Before I go to the next step and replace turbos, valve seals ect I want to make sure 100% im not getting excessive blow into the intake on deceleration.
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10-20-2015, 10:09 PM	#7
Asps91 First Lieutenant 39 Rep 364 Posts Drives: Bmw 335i Join Date: Sep 2014 Location: Sydney iTrader: (0)	is the check valve hose accessible without disassembly of the valve cover? I cant seem to find any diy's online.
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10-21-2015, 12:30 AM	#10
Turbo_power4ever Captain 93 Rep 606 Posts Drives: Fbo blacked e92 Join Date: Feb 2015 Location: Nky iTrader: (2)	Wow, dont know why the text got so blurry in that screen shot. Thats is from burgertuning oil catch can install guide
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10-21-2015, 07:05 AM	#11
Asps91 First Lieutenant 39 Rep 364 Posts Drives: Bmw 335i Join Date: Sep 2014 Location: Sydney iTrader: (0)	Thanks guys, I'm going to pull it of this Friday and inspect it. Not sure if I can be tested. If it looks suspect I will just replace it
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10-21-2015, 08:13 AM	#12
Wolf 335 Brigadier General 2341 Rep 3,539 Posts Drives: 2007 E92 335i Join Date: Aug 2012 Location: GTA - Greater Toronto Area iTrader: (0)	The check valve hose or pcv hose is accessible from the top rear after removing the engine cover (no need to remove the valve cover). Careful no to break the tabs that hold the hose clipped in. Once removed, start to flip the hose up/down and you should hear the valve flapping inside. I was told by the dealership that my pcv valve and hose was blocked and needed to be replaced. So I ended up ordering the Rob Beck metal pcv valve and bought the oem hose. After removing the pcv valve it seemed a bit sluggish, but I thoroughly sprayed brake cleaner into it and it was flapping around like new (at this point the valve had some damage from the pliers I used to remove it so I didn't bother putting it back on). I did the same with the pcv hose although mine seemed fine. I ended up taking an x-ray image of the pcv valve to see what's going on in there. Not much to it really. If you can manage to remove the valve without damaging it, you could potentially clean it up with brake cleaner and put it back on. Cheers
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10-21-2015, 08:30 AM	#13
mojobmw_e90 Major 380 Rep 1,497 Posts Drives: 2014 E63S Join Date: Oct 2014 Location: Chicago IL iTrader: (3)	Our cars have 2 check valves. One is that plastic tube and the other is the actual pcv that's underneath the fuel line that needs to be unscrewed. If your mechanic did replace the valve cover, and did use rtv around the edges, make sure that it didn't seal or cover the ports on the head that need to be left open for the engine to breath. I did a friend's valve cover after he took it to a shop for smoking and when he brought it to me I found the ports blocked off due to using to much rtv. Now he is smoke free
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10-21-2015, 08:30 AM	#14
MachWon Private First Class 25 Rep 197 Posts Drives: 2007 335i 6mt. JB4 + CDP's. Join Date: Mar 2015 Location: . iTrader: (0)	At the end of my check valve, there is a tiny filter (previous owner's doing). When I pulled it off, it was extremely oily. Like, the inside was black with oil. I'm also getting smoke on deceleration and bad oil smell. Bad PCV system for me?
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10-27-2015, 08:16 PM	#17
Asps91 First Lieutenant 39 Rep 364 Posts Drives: Bmw 335i Join Date: Sep 2014 Location: Sydney iTrader: (0)	Does anyone know if there is any other way oil can enter the combustion chamber?
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