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Old 04-27-2018, 09:31 PM   #151
colby1321
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Quote:
Originally Posted by Scargod View Post
On my '08 STi, I slowly deleted everything regarding the evap system. At one point I just had the evap line going to the back plugged off. So, I'd say you could do the same and plug both spots on the manifold.


Thatís what I figured. Seems like the better route rather than a new manifold or swapping to a metal one
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Old 05-07-2018, 07:00 PM   #152
cassinelli23
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My 2010 forester XT is throwing a P0453 code. everything I see points to changing the evap pressure sensor (42084FG020) but the pictures in the beginning of the thread have been removed. can anyone point me in the right direction?
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Old 05-08-2018, 01:04 PM   #153
colby1321
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Originally Posted by cassinelli23 View Post
My 2010 forester XT is throwing a P0453 code. everything I see points to changing the evap pressure sensor (42084FG020) but the pictures in the beginning of the thread have been removed. can anyone point me in the right direction?


Chrome has an extension you can download to fix the broken image links. I donít remember exactly what itís called but just type in p500 broken image link fox and itíll pop right up and all the pictures will work again
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Old 05-30-2018, 09:34 AM   #154
dmilburn86
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Thanks!

Last edited by dmilburn86; 05-30-2018 at 10:43 AM.
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Old 09-27-2018, 11:37 PM   #155
Pakin
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Quote:
Originally Posted by Smurftastic View Post
A helpful update for this thread - sometimes nipples can come flying off under pressure, as mine did driving through DC traffic during a morning commute, despite the ziptie! Oh noes!

I got down to troubleshooting - how to avoid the nipple -- use a plug. If you're like me and use a Perrin V2 turbo inlet, both 1/2" and 3/4" PVC plugs won't fit. I thought of ONE solution for a plug that doesn't look like crap, fits properly, and won't fail. There are many other ways to skin this cat, but this was what worked for me:

Alternatively, you can also get 1/2" plugs from Eldon James (same fittings Perrin Inlet uses), if you have more than one plug to plug up.



https://www.amazon.com/Eldon-James-P...2F2+eldon+plug
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Old 02-11-2019, 01:56 PM   #156
TheOddOne
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Originally Posted by z View Post

Blue line goes from solenoid to pipe under manifold that carries fuel vapors. (from charcoal canister in back of car)
Green line goes from solenoid to manifold.


I know this is an old post. I've been trying to read the thread but the visuals make it clearer for me. Just to confirm, the blue line comes from a pipe under the manifold (that carries fuel vapors) into the solenoid? Trying to figure out which lines go where for reassembly.
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Old 02-11-2019, 11:10 PM   #157
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Originally Posted by TheOddOne View Post
I know this is an old post. I've been trying to read the thread but the visuals make it clearer for me. Just to confirm, the blue line comes from a pipe under the manifold (that carries fuel vapors) into the solenoid? Trying to figure out which lines go where for reassembly.


Yes. Blue is from charcoal canister to feed the solenoid. That intern feeds the manifold.

Side note the system with a single solenoid as pictured here should only be operational under vacuum. It should also mean orientation of each hose shouldnít really matter as the solenoid either allows flow or doesnít. I realize there are arrows that dictate flow direction for the solenoid, but in the instance where someone may miss this and be concerned of issues; more than likely there will be no issue.


This doesnít apply to cars with two solenoids.
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Old 05-29-2019, 10:06 PM   #158
RAE129
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I have a 2008 GR STi and was having issues starting the vehicle after refueling and then after restarting the engine would run horrible. I was not receiving a CEL, so I figured electronically everything must be operating correctly. I decided to change the purge control solenoid valves (i.e. 1 & 2). I replaced both valves and decided to test the older valves to see if there were any issues.

I applied 12V to solenoid 1 (the lower of the two valves that is screwed into the intake manifold and sits at a slight angle, Subaru Part # 16102AA391) and electrically it was fine as it sparked every time I attached the leads but there was no operation of the piston that opens and closes the valve. Tried to get some air through the inlet and outlet of the valve and couldn't tell if it failed closed or if a little air was passing through.

Solenoid 2 (the upper valve that sits vertical on the metal shield on top of the intake, Subaru Part #16102AA480) opened and closed and operated normally. When open, air would flow through the inlet and exit, and when voltage was removed it closed.

I read at the beginning of this post that both solenoid valves 1&2 with no voltage are normally closed.

I'm a little confused because I dismantled Solenoid 1 and removed the metal piece and dislodged the piston, spring, metal rod, and rubber seal which keeps everything sealed and in place. I then applied voltage and the piston which seals between the inlet and exit of the traveled to the bottom to close, but did not close fully, with 12V. It didn't make a great seal and I am assuming that's why I was having issues at startup. This means that Solenoid 1 is normally open and when voltage is applied it closes.

IA Performance, can you verify? I can send pictures of both solenoid valves dismantled if you like.
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Old 05-30-2019, 09:41 AM   #159
Scargod
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Quote:
Originally Posted by RAE129 View Post
... I decided to change the purge control solenoid valves (i.e. 1 & 2). I replaced both valves ...
Did changing them out fix your problems?
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Old 05-30-2019, 12:14 PM   #160
RAE129
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Originally Posted by Scargod View Post
Did changing them out fix your problems?
So far, it seems like the new solenoids corrected the problem. This will more than likely occur again over the next 11 years if i decide to hold on to the car.

This morning, I cut above the inlet and exit points on solenoid 1 and i was incorrect in the way it operates. The valve is normally closed and when the voltage is applied, the valve opens.

It seems that over time the plastic which allows the sealing piston to slide up (open) and down (close) expanded or swelled to the point where the piston was stuck in the semi-closed or closed position . When the solenoid was energized and magnetized it could not overcome the force exerted on the metal piston, so it did not move and could not open between the inlet and exit points. This caused the issue at startup after a refill.

If anyone owns a vehicle with the two purge control solenoid valves, keep an eye out for this problem, especially if you live in a caustic environment with 4 seasons and dont have indoor parking.
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Old 08-25-2019, 04:47 AM   #161
soobfan
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Hi all,

Thanks for this thread I feel I learned so much about the Evap system.

A little weird but I'm looking at my engine bay and the evap hoses and fittings look totally different. I have an '07 WRX and I dont see the T fitting or diaphrams like I see in all the pictures I researched.

It looks like my car has the PN 16102AA391 with a plastic fitting that broke off. I see the previous owner put a nipple on the metal tube right above the valve solenoid and left the hole there.

I'm having a hell of a time passing smog as it keeps putting out the P0457. I think all I need to do is replace the solenoid and hose, connect it and it should fix the leak... My main concern is that it looks like it's a STI part and not on WRX. Can anyone confirm this can work for my car?

Below is the engine bay:


Here is the solenoid:



One thing to note is that the previous owner said they put a STI intercooler. You can tell by the black metal tubes under the intercooler that it isn't bolted down. Is it possible the intake manifold is STI? It's not red but I just haven't seen a WRX manifold that looks like this...
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Old 08-25-2019, 01:33 PM   #162
soobfan
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Wow guys. Since the solenoid is broken anyway I figure I plug the whole and see what happens. I just want to get by smog after all and fix on my own schedule but damn! So one fitting is clean snapped off like in the picture below but the fitting right below it on the same solenoid has a hose that just was tucked. It doesnít go anywhere.

Based on the picture with the lines drawn above, I should expect this hose to go under the manifold?

Can anyone help me understand where that bottom hose should connect to? Having a hard time figuring that out even with diagrams. Iím curious if the other end is capped off or just open causing my p0457
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