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10-25-2020, 06:40 PM | #1 |
Scooby Newbie
Member#: 519141
Join Date: Oct 2020
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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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10-26-2020, 03:03 AM | #2 |
Scooby Guru
Member#: 10108
Join Date: Sep 2001
Chapter/Region:
NWIC
Location: Portland, OR
Vehicle:1874 Bicycle |
Take it to a mechanic
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10-28-2020, 01:58 PM | #3 |
Scooby Newbie
Member#: 383291
Join Date: Mar 2014
Chapter/Region:
MWSOC
Location: Great White North
Vehicle:2004 Forester XT Cayenne Red |
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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10-28-2020, 02:43 PM | #4 |
Scooby Newbie
Member#: 519141
Join Date: Oct 2020
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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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10-28-2020, 02:49 PM | #5 |
Scooby Specialist
Member#: 491095
Join Date: Sep 2018
Chapter/Region:
SWIC
Location: New Mexico
Vehicle:2009 STi Blue Blue |
what is your fuel pressure at?
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10-28-2020, 03:01 PM | #6 |
Scooby Newbie
Member#: 519141
Join Date: Oct 2020
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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 |
10-29-2020, 05:51 PM | #7 |
Scooby Newbie
Member#: 519141
Join Date: Oct 2020
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11-02-2020, 09:43 AM | #8 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
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. |
11-09-2020, 10:37 AM | #9 | |
Scooby Specialist
Member#: 419354
Join Date: Apr 2015
Chapter/Region:
MAIC
Location: Newark, Delaware
Vehicle:2007 STI Crystal gray metallic |
Quote:
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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11-09-2020, 10:55 AM | #10 |
Scooby Newbie
Member#: 519141
Join Date: Oct 2020
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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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