How does a CCV/PCV system fail other than a torn diaphragm? - Bimmerfest - BMW Forums



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  #1  
Old 10-20-2019, 02:22 PM
BabyUnicornTaco BabyUnicornTaco is offline
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How does a CCV/PCV system fail other than a torn diaphragm?

I have been diagnosing my N62 X5 4.8i engine the past couple days for the possibility of failed valve stem seals. Mileage is 165,000 and the VSS are original. I went from 8,000 miles between adding a quart of oil down to 1,250 in a matter of a few weeks. Smoke appeared out of nowhere. This seemed too quick of oil consumption for VSS failure as it was sudden and not gradual. First thing I inspected was the two orange diaphragms. Neither of them are torn and both were replaced 6 months/10,000 miles ago when I resealed the top half of the engine except for the VSS. The orange diaphragm under the valve cover/drivers side was a little stuck. Like sticking to make it a little tough to lift out. This got me thinking about the possibility of a fluke issue in the CCV/PCV system. If the orange diaphragms are intact is there any other potential causes for significant and sudden oil burning? I donít have any leaks. Engine runs well. The entire PCV CCV system was cleaned 6 months/10,000 miles ago. I appreciate any info before I dive in to replace the VSS.


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  #2  
Old 10-21-2019, 10:46 AM
ArgentoCarNut ArgentoCarNut is offline
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What about turbos using up the oil?


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Old 10-21-2019, 10:50 AM
BabyUnicornTaco BabyUnicornTaco is offline
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What about turbos using up the oil?


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N62. No turbos.


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  #4  
Old 10-21-2019, 01:16 PM
robinasu robinasu is offline
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I would circle back and check the work you had done and also check for random vacuum leaks with a cheap smoke tester. That seems like a big step change in oil consumption. I guess anything can happen, but vacuum leaks are the source of many misdiagnosed repairs. It might be possible for a leak to throw off the PCV system and push oil out of the engine. Hopefully your VSS are just getting some extra lube at the moment. : )
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Old 10-21-2019, 01:30 PM
deroy deroy is offline
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My leaking valve cover gaskets caused lots of smoke in bursts every now and then, but never a drop on the garage floor. Oil smoked/burned on the cats. Easy to see burnt oil stripes with a flashlight. Also easy to check fro drips if your arms are skinny enough, just reach around to the back and feel along the edges of the valve covers.

If you can really confirm oil burns on the inside, maybe check the spark plugs?
PCV leak will affect all, valve stems I'd think are not so likely to fail all at the same time.

Last edited by deroy; 10-21-2019 at 01:40 PM.
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Old 10-21-2019, 05:15 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Originally Posted by deroy View Post
My leaking valve cover gaskets caused lots of smoke in bursts every now and then, but never a drop on the garage floor. Oil smoked/burned on the cats. Easy to see burnt oil stripes with a flashlight. Also easy to check fro drips if your arms are skinny enough, just reach around to the back and feel along the edges of the valve covers.

If you can really confirm oil burns on the inside, maybe check the spark plugs?
PCV leak will affect all, valve stems I'd think are not so likely to fail all at the same time.


Iím interested in the smoke you had from oil burning on the cats. This led to smoke out of the tailpipe?


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Old 10-21-2019, 07:33 PM
ArgentoCarNut ArgentoCarNut is offline
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Originally Posted by BabyUnicornTaco View Post
N62. No turbos.


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Old 10-21-2019, 07:53 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Haha. Yeah. No smoke today. Somethings up. Iíll be monitoring consumption, looking for smoke, and hidden leaks.


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Old 10-21-2019, 11:49 PM
deroy deroy is offline
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Iím interested in the smoke you had from oil burning on the cats. This led to smoke out of the tailpipe?


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No not from the pipe. But a nice cloud behind the car on hitting the gas on the motorway occasionally, when a drop fell on the cat. The smoke just blew to the rear from under the car.

Smoke from under the hood at standstill. Scary, until I knew what it was.


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Old 10-22-2019, 03:27 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Originally Posted by deroy View Post
No not from the pipe. But a nice cloud behind the car on hitting the gas on the motorway occasionally, when a drop fell on the cat. The smoke just blew to the rear from under the car.

Smoke from under the hood at standstill. Scary, until I knew what it was.


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Ok. Yeah I figured. I had that happen to my old Jaguar. Driving on the highway and everyone kept trying to get my attention because of all the smoke.


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