Welcome to the North American Subaru Impreza Owners Club Saturday December 9, 2023
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 11-29-2010, 01:49 PM   #1
1-3-2-4
Scooby Specialist
 
Member#: 100762
Join Date: Nov 2005
Chapter/Region: Tri-State
Location: Bangor, PA
Vehicle:
2012 WRX Hatch
14 FZ09, 03 VFR, 09 WR250

Default Purge Valve Solenoid Deletion/Bypass - Who's done it?

I went to replace both of the vacuum lines on the purge valve last night and the damn nipples broke right off. I'm going to attempt to fix this, but I'm not hopeful. I was questioning the necessity of this valve, so I'm hoping others have been down this road before me. The new part is about $112 and only available from Subaru!

I'm hoping to leave the valve plugged in so no codes are thrown, but I'm in the air on leaving the line vented to atmosphere. Does anyone know when the purge valve is opened? Aside from a turbo car where the intake charge has positive pressure, I don't see the need for the valve on a normally aspirated car. It seems to me that I can eliminate the fuel smell by simply bypassing the valve altogether and routing the line directly to the intake manifold. It will always see vacuum (exept at WOT), so it will always pull fumes from the charcoal canister. Has anyone else done this? Am I missing something on this system? Based on what I can tell, this is everything in a nutshell.
* Registered users of the site do not see these ads.
1-3-2-4 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-29-2010, 02:32 PM   #2
TFBHTMFSNE
Scooby Specialist
 
Member#: 156086
Join Date: Aug 2007
Default

Do not, I repeat, DO NOT run the line directly from the canister to the intake manifold!
During self-testing of the integrity of the fuel system for vapor leaks, the line from the tank to atmosphere is closed off. That would mean full manifold vacuum to the tank. Those funny, clunking noises you would hear would be your fuel tank collapsing.
I won't even try to go into detail about duty ratios to your CPC (Canister Purge Control) and fuel tank pressures. Let's just say bypassing the CPC will lead to some pretty rich conditions and a MIL.
Leaving the line off will result in a lean condition and MIL.
Pony up the $112 and buy a new one.
TFBHTMFSNE is offline   Reply With Quote
Old 11-29-2010, 02:52 PM   #3
1-3-2-4
Scooby Specialist
 
Member#: 100762
Join Date: Nov 2005
Chapter/Region: Tri-State
Location: Bangor, PA
Vehicle:
2012 WRX Hatch
14 FZ09, 03 VFR, 09 WR250

Default

Thanks for the information. I wasn't aware of the control logic that went on behind the scenes. My only evap system experience is on motorcycles. They are much simpler and work only by running the tank vent to the charcoal canister. One vacuum line then runs from the charcoal canister to the intake manifold. No electronics, no wizardry. Works the same with or without...but without will obviously give off a fuel smell. Good to know this is NOT how this system works.

I'm going to attempt to fix the broken nipples. If that doesn't work, time for a new one...
1-3-2-4 is offline   Reply With Quote
Old 11-30-2010, 07:38 PM   #4
00LGTP
Scooby Newbie
 
Member#: 172618
Join Date: Feb 2008
Chapter/Region: Tri-State
Vehicle:
1995 EJ253/D25 GC
371hp/355tq 1.5xtr 93oct

Default

what nipple did you break off? i repaired mine before and function normal ( no CELs)
00LGTP is offline   Reply With Quote
Old 11-30-2010, 08:58 PM   #5
Silverstg2
Scooby Newbie
 
Member#: 121872
Join Date: Aug 2006
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
04 STi
Aspen White

Default

Im not running one, and neither are lots of people, search purge solenoid for discussion
Silverstg2 is offline   Reply With Quote
Old 11-30-2010, 09:21 PM   #6
1-3-2-4
Scooby Specialist
 
Member#: 100762
Join Date: Nov 2005
Chapter/Region: Tri-State
Location: Bangor, PA
Vehicle:
2012 WRX Hatch
14 FZ09, 03 VFR, 09 WR250

Default

I broke off both nipples. They literally crumbled in my hands. I was able to repair it with plastic barbed nipples and epoxy; we'll see if it holds. I'll search around and maybe just eliminate it completely if this fails.
1-3-2-4 is offline   Reply With Quote
Old 10-11-2012, 06:41 PM   #7
Sound_Fiend
Scooby Newbie
 
Member#: 313392
Join Date: Mar 2012
Location: Phoenix AZ
Vehicle:
2006 STI
Dark Gold

Default Hello!?!?!

I know this thread is old but I broke one of my tips of the purge solenoid and was wondering if the 3 way valve can be used as a mechanical replacement over the purge solenoid. Does anyone know how the circular 3 way valve works?

My idea is that it lets pressure flow only when the center hole has suction, correct me if im wrong but couldn't I just use the 3 way valve by connecting one end to the tank gas pipe then the other end to the intake manifold and connect the center hose from the 3 way valve to the intake manifold and from my understanding, only under larger suction pressure would the valve open to suck the gases?

Could I do this?
Sound_Fiend is offline   Reply With Quote
Old 10-11-2012, 07:02 PM   #8
V8Slayer
Scooby Specialist
 
Member#: 111565
Join Date: Apr 2006
Chapter/Region: W. Canada
Location: Winnipeg
Vehicle:
2007 Legacy Spec.B
324hp/313tq EVOIII 16G

Default

I had one of those stupid plastic nipple brake off last week, a healthy dose of JB weld and an allen key to hold the nipple in place and I was gtg 24 hours later
V8Slayer is offline   Reply With Quote
Old 10-11-2012, 07:07 PM   #9
Sound_Fiend
Scooby Newbie
 
Member#: 313392
Join Date: Mar 2012
Location: Phoenix AZ
Vehicle:
2006 STI
Dark Gold

Default

Could I just use the 3 way circular valve like I stated above? and just not use the purge solenoid. So bypassing it.
Sound_Fiend is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Purge Valve Solenoid Help PolarisSnT Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 3 03-26-2008 02:37 PM
Buy impreza and make it nasty, who's done it? Poodie General Community 30 07-16-2006 03:31 PM
trip back from the dealer...valve adjustment on Subaru's? who's had it done? shukes24 Mid West Subaru Owners Club Forum -- MWSOC 9 12-29-2004 04:42 PM
Complete 180 career change. Who's done it, how did it go?? donjuan Off-Topic 7 08-09-2004 06:33 PM
WRX vs. 2003 Cobra. Who's done it? metoo Texas Impreza Club Forum -- TXIC 70 08-18-2002 03:07 AM

All times are GMT -4. The time now is 03:10 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2023 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.