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Old 01-08-2017, 11:51 PM   #1
05-STI
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Default Mystery oil leak!!

Just as the title says. I have oil on the top of my block pooling near the PCV valve. It's also burning off on my turbo up-pipe and exhaust manifold. I've been searching for this leak for a long time and can't seem to solve it. I suspected the AVCS/oil feed line; so I made a custom line that goes on the outside of the intake manifold rather than like the OEM one that runs under. That's not the culprit. I've read somewhere that excessive blow by can cause an oil leak through the PCV? I plan on getting an Oil catch can, but don't think that will resolve my oil leak. I've replaced both rocker covers recently and the half moon seals on the passenger side. The rocker cover and half moon seals are dry on the passenger side. Could oil somehow be coming out of my turbo CHRA? Any help would be appreciated. Thanks in advance!
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Old 01-09-2017, 06:45 AM   #2
hondaeater69
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have you checked the actual PCV valve? perhaps it's stuck closed and forcing oil to pool on the block then be burnt off the manifold. also make sure the pcv system is routed properly. the pcv outlet should go to the turbo inlet. the PCV gets it's reference from the back side of the intake manifold, make sure all your pcv hoses are proper and routed, and that the valve is opening when it should (at idle). if you unplug the pcv outlet hose from the turbo inlet, at idle you should feel some pressure coming out of it.
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Old 01-09-2017, 10:02 AM   #3
Duser
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Indeed check the pcv assembly. Those hoses get brittle, and prohibit a good seal to the block. I fought that same puddle on mine, and it was that hose seeping.
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Old 01-09-2017, 10:55 AM   #4
blobeye_popeye
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Check the oil line at the bottom of the turbo.
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Old 01-09-2017, 02:51 PM   #5
05-STI
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Quote:
Originally Posted by hondaeater69 View Post
have you checked the actual PCV valve? perhaps it's stuck closed and forcing oil to pool on the block then be burnt off the manifold. also make sure the pcv system is routed properly. the pcv outlet should go to the turbo inlet. the PCV gets it's reference from the back side of the intake manifold, make sure all your pcv hoses are proper and routed, and that the valve is opening when it should (at idle). if you unplug the pcv outlet hose from the turbo inlet, at idle you should feel some pressure coming out of it.
I'll be sure to check everything you just told me! Thanks!
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Old 01-10-2017, 10:43 AM   #6
relative4
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There's a little rubber breather hose that comes out of the top center rear of the block, near the PCV valve. It hardens, cracks, and leaks a ton.
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Old 01-10-2017, 12:11 PM   #7
kenliu84
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Quote:
Originally Posted by relative4 View Post
There's a little rubber breather hose that comes out of the top center rear of the block, near the PCV valve. It hardens, cracks, and leaks a ton.
This might be it. I had the same issue and oil was also leaking down and driving caused the oil to splatter all along the underside towards the muffler.
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Old 01-10-2017, 01:32 PM   #8
05-STI
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My PCV itself isn't cracked. The line going to the turbo inlet has a bit of pressure behind it. If I wasn't told about it, I probably wouldn't have felt anything because it was very minimal. I'll find that line that hardens and cracks as well. I'll have to find it first. Thanks for the input guys I'll let you know what I find!
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