burnout8488 Posted December 9, 2010 Share Posted December 9, 2010 If so, where is it? I know the GT has one - haven't been able to find mine on the 2.5i... not in person nor in the service manual. Link to comment Share on other sites More sharing options...
apexi Posted December 9, 2010 Share Posted December 9, 2010 Yes it does, it's not easy to see. http://home.comcast.net/~dsmphotos/subie/2.5ipcv.jpg Link to comment Share on other sites More sharing options...
NORULZleggy Posted December 9, 2010 Share Posted December 9, 2010 wow that is way down there. Link to comment Share on other sites More sharing options...
burnout8488 Posted December 9, 2010 Author Share Posted December 9, 2010 Jesus! Thank you Link to comment Share on other sites More sharing options...
N.sane Posted December 9, 2010 Share Posted December 9, 2010 Wow, thanks for the pic, wouldve never found it otherwise. How often should it be replaced btw? Link to comment Share on other sites More sharing options...
soloz2 Posted December 10, 2010 Share Posted December 10, 2010 If you pull it off you'll know if it needs to be replaced or not. They aren't expensive and are easy to replace. Current: 16 Crosstrek Premium w/ Eyesight & 05 Outback XT 5MT Past Subies: 14 FXT Premium, 14 WRX hatch, 06 Legacy 2.5i SE 5MT, 98 Outback wagon Link to comment Share on other sites More sharing options...
GEE-OTTO Posted December 14, 2010 Share Posted December 14, 2010 What is that a 19mm plug? I need to do this to my Legacy its been 73k miles Link to comment Share on other sites More sharing options...
mwiener2 Posted December 14, 2010 Share Posted December 14, 2010 there is no change interval on them. You only replace it if it's broke. My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
ShrinerMonkey Posted December 14, 2010 Share Posted December 14, 2010 No maintenace interval prescribed but it is good/cheap preventative maintenance to replace it. Plugged PCV valves can cause some pretty nasty issues if not taken care of right away. Link to comment Share on other sites More sharing options...
apexi Posted December 16, 2010 Share Posted December 16, 2010 Not sure what size the pcv is, I just have subaru do it since they only charge me $12 for labor. I replace mine every 30k. Link to comment Share on other sites More sharing options...
burnout8488 Posted December 17, 2010 Author Share Posted December 17, 2010 I don't think they ever really *need* to be replaced. You can revitalize a sticky one by spraying carb cleaner inside and letting the oily gunk drain out. When it rattles, it's functional. As far as I know, they're just metal inside... aka nothing to break or go wrong. They just get sticky. Link to comment Share on other sites More sharing options...
soloz2 Posted December 17, 2010 Share Posted December 17, 2010 The only time I've ever HAD to replace one was in my 98 outback. We got it over the summer from a family member who didn't know how to maintain it. They dumped a couple grand into it at shops but the engine was still missing, it had a horrible shudder when up to any decent speed and had no power. It threw a CEL for the Valve and I had to replace that one. But that's it. The car is running good now BTW. 214k and counting Current: 16 Crosstrek Premium w/ Eyesight & 05 Outback XT 5MT Past Subies: 14 FXT Premium, 14 WRX hatch, 06 Legacy 2.5i SE 5MT, 98 Outback wagon Link to comment Share on other sites More sharing options...
apexi Posted December 17, 2010 Share Posted December 17, 2010 The only reason I replace mine is because my legacy goes through 1qt-1.5qt's of oil over a 5k interval, and I'm convinced its being consumed through the pcv system. I'm hoping one time when I replace the pcv valve I'll get lucky, and there will be a redesigned valve that doesn't let this happen. Link to comment Share on other sites More sharing options...
burnout8488 Posted December 20, 2010 Author Share Posted December 20, 2010 The only reason I replace mine is because my legacy goes through 1qt-1.5qt's of oil over a 5k interval, and I'm convinced its being consumed through the pcv system. I'm hoping one time when I replace the pcv valve I'll get lucky, and there will be a redesigned valve that doesn't let this happen. I'm convinced of that too, that's actually why I made this thread! I'm supicious it might be the cause, not valve seals or bad rings. It doesn't really smoke either which has me stumped. Link to comment Share on other sites More sharing options...
burnout8488 Posted December 30, 2010 Author Share Posted December 30, 2010 What a b*tch this thing was! I did it last night. You need to remove the airbox torque chamber, tube, and disconnect the main harness mounting bracket just to be able to get a wrench in there! The PCV valve requires a 3/4" spanner. There is not much room to work down there at all, and removing the hose from the PCV valve was a fight in itself. Mine was the original with 105,000mi on it. Totally frozen, and caked with oil deposits. Wouldn't rattle at all. I've been consuming a good bit of oil lately, so I'm hoping it's the culprit. The replacement was $20 from autozone. Seems high. Link to comment Share on other sites More sharing options...
apexi Posted December 30, 2010 Share Posted December 30, 2010 keep us updated, I'm curious to see if your consumption changes. Link to comment Share on other sites More sharing options...
ShrinerMonkey Posted December 30, 2010 Share Posted December 30, 2010 I am guessing your oil consumption will go down. A plugged PCV can be devastating to engines if not fixed. Link to comment Share on other sites More sharing options...
N.sane Posted December 30, 2010 Share Posted December 30, 2010 Hmm, interesting. I think Ill replace it along with my 60k service. Gotta take off the intake anyway for the spark plugs Link to comment Share on other sites More sharing options...
burnout8488 Posted December 31, 2010 Author Share Posted December 31, 2010 I am guessing your oil consumption will go down. A plugged PCV can be devastating to engines if not fixed. I hope so. Could have been placebo effect, but the car did pull pretty nicely today - more than I expected. Could have been the cool air too. Who knows! Won't be able to post impressions for a thousand miles or so though, especially given how inaccurate our dipsticks are. "Stuck closed causes a slight power loss. The PCV valve has one major function and one minor side-benefit: it allows crankcase oil vapor to be burned instead of venting to atmosphere and the vacuum applied to the crankcase reduces crankcase pressure slightly. Pistons moving up-and-down pump crankcase air as wells as intake air, using horsepower to do so. Reducing the crankcase pressure reduces pumping losses." Yay! Link to comment Share on other sites More sharing options...
burnout8488 Posted January 1, 2011 Author Share Posted January 1, 2011 I noticed a crazy misfire at low RPM yesterday, and found the culprit this morning. Check this out! Video: http://i24.photobucket.com/albums/c20/burnout8488/th_VID-20110101-00000.jpg SOMEHOW, the PCV valve hose is sparking against my #2 spark plug wire. How the hell does a spark jump to rubber?! I ended up zip-tying it to the metal torque-box support, away from the coil pack. Link to comment Share on other sites More sharing options...
ShrinerMonkey Posted January 1, 2011 Share Posted January 1, 2011 You might want to check your ground to be sure it is tight. Link to comment Share on other sites More sharing options...
burnout8488 Posted January 2, 2011 Author Share Posted January 2, 2011 Which one? Link to comment Share on other sites More sharing options...
ShrinerMonkey Posted January 3, 2011 Share Posted January 3, 2011 I would start at the negative battery terminal and work back from there paying special attension to the engine block grounds. Link to comment Share on other sites More sharing options...
burnout8488 Posted January 5, 2011 Author Share Posted January 5, 2011 I guess that makes sense, but still doesn't explain why sparks are transferring into a 100% rubber hose! It's only doing it because my friend and I were yanking on the tube, and probably deformed it to where it is closer to the coil pack now. In any case, I ziptied it back and its perfect now. My MPG increased SIGNIFICANTLY after changing the PCV. I averaged 31.5mpg over 180mi with the cruise set yesterday. I usually only averaged 26-27mpg. Calculations were made using the trip computer which may not be 100% accurate, but the relative difference in mpg is still astonishing to me. Link to comment Share on other sites More sharing options...
naimouasta Posted January 20, 2011 Share Posted January 20, 2011 bump! how is the pcv doing? gas mileage? oil consumption? i think i need to do this asap. where did you buy the PCV? oem or aftermarket? fred beans has them for sale but it looks like its just the hose section?!? i'd imagine the actual pcv attaches to the bigger stubby hose, and then its screws into the engine block? those hose clamps look like a one time deal, i'll probably cut them and just get regular clamps. http://www.fredbeansparts.com/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/1/0/10105ab790.jpg heres an aftermarket one listed for $26.96. is this similar to what you used?...or did you get a whole hose section with it too? http://www.autopartswarehouse.com/images/product_images/thumbs200/beck_arnley/045-0351.jpg http://www.autopartswarehouse.com/sku/Subaru/Legacy/Beck_Arnley/PCV_Valve/2008/2-dot-5i_Special_Edition/4_Cyl_2-dot-5L/045-0351.html?tlc=Engine+%26+Drivetrain Link to comment Share on other sites More sharing options...
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