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Old 10-25-2020, 06:40 PM   #1
syph0r
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Default missing breather, air leaks

alright... so I got a my07 wrx that had a built block with forged internals, injen intake, Mishimoto TMIC, Magnaflow TBE, and now a vf43. I am working with a remote tuner, and I am way too lean, especially under boost. I've narowed down my leak to the CCV system. I've been looking up as much information as I can and from everything I'm seeing, I am missing the center crankcase breather port. the metal line that goes from left valve cover to right valve cover and is under the intake should have a line coming off it and going to the center of the crankcase. mine is capped. there is no spot in my block to put it.

So basically do I need that port? do I need to find a way to vent those lines back into the crankcase or can I just block them off or vent them to a catch can or VTA?

The other metal line that attaches to the IC is gone but the ports are connected by a hose that goes to the turbo inlet. the PCV is connected to the turbo inlet and the intake manifold. With the inlet disconnected from those and capped and the intake manifold pcv line capped my afr is where it needs to be.

Can someone please help me figure out what to do?
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Old 10-26-2020, 03:03 AM   #2
gabedude
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Take it to a mechanic
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Old 10-28-2020, 01:58 PM   #3
GalaxyWide
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It sounds like your PCV valve is shot, the crankcase port and valve cover breathers shouldn't have anything to do with intake air/AFR.
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Old 10-28-2020, 02:43 PM   #4
syph0r
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Galaxy wide I've replaced the pcv valve and those hoses on it. Still have a vacuum leak. I did find that the base hose had a leak, replaced it and still going lean.
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Old 10-28-2020, 02:49 PM   #5
Jedi03
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what is your fuel pressure at?
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Old 10-28-2020, 03:01 PM   #6
syph0r
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Not sure Jedi but I can run and get a fuel pressure tester and check it and report back.

I do know that with the pcv capped off my afr is rich instead. ...at least under boost
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Old 10-29-2020, 05:51 PM   #7
syph0r
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Quote:
Originally Posted by Jedi03 View Post
what is your fuel pressure at?
Idle is around 35-40 kind of bounces with this gauge. If I remove the vacuum from the fpr then it jumps to about 45
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Old 11-02-2020, 09:43 AM   #8
BeastianSTI
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Have any pictures? Might help us get a better idea of what you're looking at.

If I was having to deal with all that, I'd probably install an IAG street AOS or something at the same time. IIRC they give you a replacement "PCV" valve.
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Old 11-09-2020, 10:37 AM   #9
Subie_
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Quote:
Originally Posted by syph0r View Post
Idle is around 35-40 kind of bounces with this gauge. If I remove the vacuum from the fpr then it jumps to about 45
Pressure is normal.
Do you have the ability to read your short term fuel trim?
Have you done a boost leak test? Pics would be helpful. We like to play the "what's not right in this pic" game
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Old 11-09-2020, 10:55 AM   #10
syph0r
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Update!

I'm basically feeling dumb. Pulled my plugs and they were at 0.050 gap I got new plugs with proper gap. That solved the misfire issue when full throttle. I also found out the air filter was restricting air flow, with the air filter off it runs amazingly. Logs show that with the air filter on my injector duty was maxed at 60% wot and without filter it was 99% at wot. Now I have a new filter and am letting the ecu run through the learning process
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