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Reconnected PCV System = lots of oil smoke

fastasleep

Well-known member
Joined
Jan 14, 2005
Messages
1,779
Location
Christiansburg, VA
I reinstalled my PCV system, because ever since I had some oil leaks repaired around the oil filter housing/cooler, my dipstick has been popping out under the littlest amount of boost pressure.

I thought it could be due to the fact that since positive crank case pressure is no longer leaking from where it was previously, it might now be trying to escape through the dipstick. And since my PCV and valve cover breather were both vented to the atmosphere (intake inlet capped off), I thought I would see if reconnecting the PCV system would alleviate any positive crank case gases and solve my dipstick-popping issue. (I have no idea if this is a mechanically sound theory or not - I just thought I'd try it).

Since reconnecting my PCV valve to its inlet on the intake manifold and running the valve cover breather back to the intake pipe (between MAF and turbo), my car blows a decent amount of smoke in first gear - from take off, especially in the shift between 1st and 2nd. I'm fairly certain it's oil smoke. The idle is also rough and somewhat irregular. Could my PCV be dumping oil into the intake manifold?

I can't figure it out.

Additionally, I've been noticing oil saturation around my exhaust manifold gasket. Where would this be coming from? It doesn't appear to be coming from the valve cover gasket.



Here's how I have it setup.



Any ideas?
 

EHmotorsports

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Joined
Sep 25, 2012
Messages
1,278
Location
Beaverton
You created a vac leak after the maf when you unplugged the port on the turbo inlet boot. The catch can cannot be vented to atmosphere when using a Maf.
 

minneSNOWta

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Joined
May 14, 2011
Messages
363
Location
Eagan, MN
It would be good to read about how the PCV system works and proper catch can setups. PCV System . I followed Setup #1 and used two sealed cans.
 

fastasleep

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Joined
Jan 14, 2005
Messages
1,779
Location
Christiansburg, VA
So, I've already read the DSM Tuners article. When it shows "Setup 1" for example, and it shows a "catch can" with an In/Out between the valve cover breather and the intake, is that a SEALED catch can? ie one that is not vented to the atmosphere with a filter?

If I run a hose directly from the valve cover breather into the post-maf port on the intake, will that eliminate the vac leak and resolve the issue?
 
Last edited:

Brunoboy

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Joined
Apr 25, 2008
Messages
2,880
Location
San Bruno,CA Home of SFO
That's how it's supposed to be..... Straight from the VC to the intake pipe
 

fastasleep

Well-known member
Joined
Jan 14, 2005
Messages
1,779
Location
Christiansburg, VA
Ok, cool. I guess I misinterpreted the image in the Setups, believing that the catch-can was the kind of vented catch can you see everywhere and not one that is sealed.
 
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