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URGENT: PCV routing LQ4

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Old Apr 29, 2025 | 09:03 AM
  #41  
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Originally Posted by 01CamaroSSTx
Did you notice any oil fould plugs? Are you having to add engine oil to the crankcase due to a loss of oil and yet there's no visual signs of an oil leak?
Plugs are fouled with carbon and and some of them have fuel on them, possibly a slightly oily mixture. But none of them were soaked with just oil. Have not needed to add any oil because as stated before, I am finding that fuel is entering the oil. Also, like I mentioned before, I found oil puddled beneath my driver side exhaust. Once I saw this, my immediate thought was bad rings - oil making its way past the rings and into the exhaust. However, my compression test is telling me this might not be the case??? Great, even compression across all cylinders.
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Old May 1, 2025 | 02:50 PM
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Following up on the PCV setup on my engine. I will be sending my engine off to a builder to get some internal problems addressed, but while I meet with him, I'd like to get my PCV routing finalized. Can anyone confirm that my setup makes sense and will work? I am running a TBSS intake, Holley valve covers *without* built in pcv valve, WS6store Norris catch can. After talking with WS6store, he assured me that no inline pcv valve is necessary, as the can itself has enough restriction inside of it. However, I do have an inline Beck Arney plastic pcv valve I was originally running as well. Should I use this or run without it?

Also, my TBSS intake has the top port (kind of near the MAP sensor) which has a line connecting to the top of the catch can. However, there is also another open port close to the front of the intake that was used for something EVAP related. I currently just have this capped off - is this ok?

Here is my setup (same as I posted originally). Let me know if this works, and what you think about the inline pcv valve with the catch can:


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Old May 1, 2025 | 02:58 PM
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https://www.corvetteforum.com/forums...umption-2.html

Looking at post #31 in the link above, this guy did not run any lines to the pass valve cover. His setup is a little different but sounds successful. Not sure which way to go
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Old May 1, 2025 | 06:25 PM
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PCV systems are mostly common sense, with no rocket science involved.
Basically you need to tap into a filtered air source AFTER any MAF sensor (if one is used) but BEFORE the throttle blade.
That air enters UNRESTRICTED into one valve cover, goes thru the engine to the opposite valve cover that has EITHER a restricted nipple on it OR put a PCV valve in the line going to a manifold vacuum source. Pretty much it.
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Old May 1, 2025 | 07:36 PM
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Originally Posted by G Atsma
PCV systems are mostly common sense, with no rocket science involved.
Basically you need to tap into a filtered air source AFTER any MAF sensor (if one is used) but BEFORE the throttle blade.
That air enters UNRESTRICTED into one valve cover, goes thru the engine to the opposite valve cover that has EITHER a restricted nipple on it OR put a PCV valve in the line going to a manifold vacuum source. Pretty much it.
Thanks for explaining that, makes sense. So then my setup should work and I’ll go ahead and use the inline pcv.

do you see a better/more efficient way to run it before I commit to this? Open to opinions
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Old May 1, 2025 | 09:41 PM
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Originally Posted by trever20
Thanks for explaining that, makes sense. So then my setup should work and I’ll go ahead and use the inline pcv.

Do you see a better/more efficient way to run it before I commit to this? Open to opinions
I think your setup nails it
It can't be any simpler than what you show
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