PCV Valve Replacement

What's the usual lifespan of these? Any way to easily tell if it needs replacing w/o removing the whole IC/mani assy?

no need to remove the mani -- just the i/c; the specialty clamps are a pita, though -- you need the tool or new clamps. i don't know the interval, i just remember playing around near it from my inlet swap -- maybe 60K mi, but it's a relatively cheap part.

I didnt think you changed these out on the lgt for some reason.....

I believe they are a part of the 96k km service (which would be about 60k mi) but I'm not entirely sure... seems like one of those things they'd change just to keep jacking the price up through labour charges at the dealer. I dunno tho, just wondering if anyone has had issues with it sticking or failing over time?

Is it hard to get out or is it like the old style where it just connects to a vacume hose somewhere

threads in IIRC...Mines was kinda hard to get out..

Just curious, did anyone actually replace the PCV?
I installed a perrin inlet over the weekend and took the PCV out. As far as I could tell there was no valve at all, nothing opened or closed to restrict air movement one way or the other. So, it seems there would be no reason to replace the PCV; unless somehow it became completely clogged with gunky oil, but I doubt that would happen. My car has 50k and that PCV "valve" was completely clean.
Also, the electrical plug that goes there seems to just be a dummy, it doesn't actually plug into anything on the other side, it just has a metal "U" that completes the circuit. I'm not sure how it would ever know if the PCV wasn't functioning, or why there is an electrical plug there at all?

Anyway, I just took the PCV out completely and now have that crankcase line "T"ing with the valve cover return line and going to a catch can, then back to the turbo inlet.

you sure you went off the right line? -- there are 2 over there in the center above the cc that look pretty similar.
the gray diagnosis connector does have a harness, it's what the "u" pin you take out of it goes into; never really studied it, but it looks like the hose-end works off of vac somehow.
pcv out doesn't sound like a safe way to run -- .02

The PCV valve is in there and it is important. No PCV system will mean short engine life and the way the OP has it set up now is not the way to do it.



Actually I read somewhere that Subaru puts a blank in the Legacy and THAT'S how they detune it from the STI; without the blank the Legacy engine BECOMES the STI engine and has 300 hp, but that's just what I've read.

Rao - The Spec.B. has the full blown STI PCV.

Obviously.

In the first picture is the black thing circled the actual PCV? If so I left that in place. There was a gray plastic fitting(where the electrical plug was) after that black piece that went to the stock inlet, that is what I removed as I saw no way that could be a valve. The second picture circled section is what I ran to the catch can, and I have the hose after that black piece(PCV I hope) going to a T with that breather to the catch can, then a line from catch can back to the inlet.

pictures gathered from http://www.legacygt.com/forums/showt...cv#post1807820

pic 1 looks like the pcv.
the gray diagnostic plug is fine to remove with an aftermarket inlet, just extract the male pin and use it to rig the harness.
that black plastic y-pipe is venting the valve covers, your circled line goes to the intake. the cc vent gets teed into the p/s valve cover line via perrin's instructions (not to imply that their routing is rubric, just that it works ).
i'm not a catch can guy, so i don't know about that factor, but what you describe above sounds a lot better than what you posted prior

Yeah, I think the confusion is some people (I used to also) think that gray diagnostic plug is the PCV. I really can't tell why subaru used that gray thing, as far as I can tell it does nothing and it couldn't actually "sense" anything, as the plug just goes into the plastic, no sensor there at all.

As far as the catch can, yeah I'm kind of on the fence on those. I got a new perrin unit for real cheap in the classifieds so I figured I'd try it as I already had a used perrin inlet to install. When I took my TMIC off there was a little oil in the hose that connects to the throttle body, so who knows, maybe the catch can will prevent that from getting there in the future.

So if the black thing in picture #1 really is the PCV anyone actually replace theirs? It seems like it would be kind of a b#%ch to get all those fittings off and actually install a new one.

Err, so does anyone have a part number for this? I can't find it on Fred Beans. All they have listed are ones for a 2.5NA and H6.

http://www.trademotion.com/partlocat...05&catalogid=1

Warren