Replacing pcv valve

Rennes · 03-23-09, 05:53 AM

Tools needed:

PLEASE UNDERSTAND THIS: the PCV valve is NOT on the recommended subaru maintenance. I don't understand why people would want to change it.

The way to know if a PCV valve is working correctly, you shake it and you should hear it "rattle".
YouTube - pcvvalve

Brief explanation of the PCV valve system:

Start by removing these 3 10mm bolts

Remove both 12mm bolts and watch out for the gasket behind the BPV!

Remove the clamps using your flathead screwdriver.

remove this 12mm bolt

other side, another 12 mm bolt.

Remove the coupling from the turbo using the flathead screwdriver.

Push the intercooler back and it should pop out.

The green circle is the PCV valve to be changed.

Reinstall everything and you are done!

jasonlee4180 · 03-23-09, 06:00 AM

Great DIY! It's about time someone took the effort answer this long time question for our STI's.

thumbs up!

Exodus751 · 03-23-09, 06:08 AM

yay`!!

seattle944t · 03-23-09, 12:38 PM

Quote:

Originally Posted by Rennes

PCV valve explanation:

Your PCV explanation graphic is not correct. The pressure control solenoid =! PCV. PCV is Positive Crankcase Ventilation valve and uses manifold vacuum pressure to draw out crankcase vapors. The pressure control solenoid is used as part of the evaporative emissions system for handling gas vapors from the gas tank.

Otherwise, nice wright up.

Rennes · 03-23-09, 01:29 PM

Thanks seeing that, I copied the wrong diagram from the FSM.

I'll update this asap.

munky69 · 04-01-09, 12:27 PM

Quote:

Originally Posted by Rennes

PLEASE UNDERSTAND THIS: the PCV valve is NOT on the recommended subaru maintenance. I don't understand why people would want to change it.

LOL why make a write up for it? good job tho, easy to follow

Fear-No-Evo · 06-08-09, 08:26 AM

Nice write up, thanks!

bandit33 · 08-04-09, 01:00 PM

remember to by the entire three piece assembly, I failed to do so and realized that removal would cause breakage to the housing (three piece assembly) opted then to pull the whole assembly from engine block and cleaned with carb cleaner. This gave me a noticable improvement in the PCV valve and once again could hear it "click" when shaken back and forth, i agree this write and pics were very helpful.

OEM_STI_STL · 08-05-09, 01:53 PM

I called my dealer for a pcv for my 05 sti. THEY SAID THERE ISNT ONE

Brushfire · 08-05-09, 02:10 PM

Quote:

I called my dealer for a pcv for my 05 sti. THEY SAID THERE ISNT ONE

Yeah, I have found that most people are too lazy, or just pull info out of their nose at these dealerships. I usually research the part # and force them to order it.

If an '04 has one and my '06 has one, then logically the '05.....

Quote:

opted then to pull the whole assembly from engine block and cleaned with carb cleaner. This gave me a noticable improvement in the PCV valve and once again could hear it "click" when shaken back and forth

This is probably your best advice. Free and no dealership involvment.

03-23-09, 05:53 AM	#1
Rennes Advanced Contributor Level 4 Feedback Score: 1 reviews Car: 04 Subaru WRX STi Fav Mod: Fujitsubo!!!!!!!! My: Subaru Parts for sale Join Date: Nov 2006 Location: Québec Posts: 435	Replacing pcv valve Tools needed: PLEASE UNDERSTAND THIS: the PCV valve is NOT on the recommended subaru maintenance. I don't understand why people would want to change it. The way to know if a PCV valve is working correctly, you shake it and you should hear it "rattle". YouTube - pcvvalve Brief explanation of the PCV valve system: Start by removing these 3 10mm bolts Remove both 12mm bolts and watch out for the gasket behind the BPV! Remove the clamps using your flathead screwdriver. remove this 12mm bolt other side, another 12 mm bolt. Remove the coupling from the turbo using the flathead screwdriver. Push the intercooler back and it should pop out. The green circle is the PCV valve to be changed. Reinstall everything and you are done! Last edited by Rennes; 03-23-09 at 01:30 PM.

03-23-09, 06:00 AM	#2
jasonlee4180 Advanced Contributor Level 3 Feedback Score: 3 reviews Car: 06 Aspen White STI Fav Mod: Dom3xtr My: Subaru Parts for sale Join Date: Mar 2006 Location: ABQ, NM Posts: 328	Re: Replacing pcv valve Great DIY! It's about time someone took the effort answer this long time question for our STI's. thumbs up!

03-23-09, 06:08 AM	#3
Exodus751 Advanced Contributor Level 5 Feedback Score: 2 reviews Car: Black 07 STi Fav Mod: Coming Soon My: Subaru Parts for sale Join Date: Feb 2008 Location: near philly Posts: 501	Re: Replacing pcv valve yay`!!

03-23-09, 01:29 PM	#5
Rennes Advanced Contributor Level 4 Feedback Score: 1 reviews Car: 04 Subaru WRX STi Fav Mod: Fujitsubo!!!!!!!! My: Subaru Parts for sale Join Date: Nov 2006 Location: Québec Posts: 435	Re: Replacing pcv valve Thanks seeing that, I copied the wrong diagram from the FSM. I'll update this asap.

06-08-09, 08:26 AM	#7
Fear-No-Evo Advanced Contributor Level 4 Feedback Score: 0 reviews Car: PBP 2011 STILimited Fav Mod: spending tons of money on mods, then buying a new sti every 3 yrs!! My: Subaru Parts for sale Join Date: Jun 2008 Location: lindenwold, NJ Posts: 477	Re: Replacing pcv valve Nice write up, thanks!

08-04-09, 01:00 PM	#8
bandit33 Becoming A Contributor Feedback Score: 0 reviews Car: White 04 WRX STI Fav Mod: Cobb Accessport v2 My: Subaru Parts for sale Join Date: Jul 2009 Location: Saskachewan Canada Posts: 15	Re: Replacing pcv valve remember to by the entire three piece assembly, I failed to do so and realized that removal would cause breakage to the housing (three piece assembly) opted then to pull the whole assembly from engine block and cleaned with carb cleaner. This gave me a noticable improvement in the PCV valve and once again could hear it "click" when shaken back and forth, i agree this write and pics were very helpful.

08-05-09, 01:53 PM	#9
OEM_STI_STL Becoming A Contributor Feedback Score: 0 reviews Car: 05 STI Fav Mod: Coming Soon My: Subaru Parts for sale Join Date: Jul 2009 Location: St. Louis Posts: 31	Re: Replacing pcv valve I called my dealer for a pcv for my 05 sti. THEY SAID THERE ISNT ONE

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