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Old 07-13-2008, 03:00 AM   #1
Minjin
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Join Date: Nov 2007
Location: Harrisburg, PA
Vehicle:
98 OB M/T
99 Miata

Default Purge Control Valve Mystery

I created a thread in the Service section but no ones seems willing or able to help me. I figured I'd try here since its a bit more focused.

When I picked up my car, it had a CEL. Reading it showed P0443, purge control valve low input. A bit of searching on the engine and I came across a connector right next to a solenoid that wasn't plugged in. A bit of comparison with the emissions label, and who woulda thunk it, its the purge solenoid. Plug it in, right?



Won't fit. Turns out that the plug is quite different and doesn't match the solenoid. It comes out of the harness right next to the solenoid and I only have one other code at the moment (P0302) so its not likely that there is a connector cross connect. When I put a couple resistors into the plug, the purge code clears. That seems pretty straight forward to me. So whats the problem? Is it the wrong valve? If I go look at an online subaru parts place and look up my car, the part number I want is 14774AA271, which just so happens to be what I have on my car already.



I had been thinking that maybe the shop swapped it with a 2.2L solenoid but that doesn't seem to be the case. Maybe my 98 is acting like a 99 and its some mix of parts (even though its made in 7/97)? So I looked up the 99 part:



Nope, its pretty obvious from looking at that connector that it isn't what I need. Here's my connector:



I looked up the 97 and its the same as the 98. No go.

Next, lets look in the shop manual. The shop manual says that the connector for the purge control solenoid is blue with two terminals. Mine is black and a search in my engine bay shows no blue connectors. The shop manual also doesn't mention a single black connector on the engine harness, yet thats what I have. Same applies to 97 and 99 shop manuals. How about wires?



The 98 manual is corrupt in this area. But looking at the 97 manual and the 99 manual shows that they are consistent, that being YR and WL. Translation: yellow/red and white/blue. Sure looks like the right wires to me. So whats going on with the connector?

I perused through all the parts on the subaru parts place and came across one picture that interested me:



Certainly looks like it has potential. Look at the connector shape with the ridges on top and sides. It has the single bolt hole (where it bolts to the manifold) and two vacuum lines. So whats it called? Duty solenoid valve, p/n 16102AA080. I have no idea what this thing is and the manual only shows duty valves in the automatic tranny. This thing doesn't look like it belongs in a tranny.

Any thoughts? No, I'm not going to just buy some random $85 valve. And yes, it needs to be fixed.
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Old 07-13-2008, 09:28 AM   #2
Jonathan
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1999 Legacy GT Ltd
Quick Silver Metallic

Default

Where abouts on the motor / engine bay is this "Purge control Solenoid" located ?

I think its a fair bet that you are running some sort of a "Frankenstein" motor that maybe wasn't intended to work in your exact make/model '98 Outback with Manual Transmission.

Are there any automobile graveyard / recycling places located near you ?
Maybe you could grab the correct valve off of a used car being parted out.

Also maybe a few of us with similar make/model/year Subarus could all look at how our cars are wired up and post photos of our "purge control valve" connectors for you.
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Old 07-13-2008, 01:24 PM   #3
Minjin
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99 Miata

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Purge control solenoid is located on the passenger side of the intake manifold. Its right below the runners. And yeah, I've been to junkyards but newer cars always have the engine and harness cut out so I haven't been able to compare them. I really have no idea whats going on with this engine. Something has to be wrong with the manual or parts lookup. I can't see any possible reason for someone to have swapped in a different connector (and so expertly).
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Old 07-14-2008, 01:59 AM   #4
merikgvr4
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Default offtopic but

just wanted to say you have a nice collection of cars there. Especially the 91 GVR4.
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Old 07-14-2008, 11:16 AM   #5
jey
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2011 Tribeca
1995 Legacy Wagon

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The second part you have a picture of is not a purge control valve - that's a vacuum valve that leads to a pressure sensor and I think the cruise control. The last part you have a picture of does look like a purge control valve - looks like these parts places may have some inaccurate information.

I happen to have purge control valves off of a 2.5L 98 Outback and a 2.2L 98 Legacy L sitting at home. I will try to take a picture of the Outback one when I get home and see how that compares to what you have.
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Old 07-14-2008, 11:42 AM   #6
Minjin
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99 Miata

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Thanks, I'd appreciate it. So far, I am relying on factory manuals and parts lookup for my information. All 2.5s in the junkyard get pulled so I haven't been able to look at one other than mine.
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Old 07-14-2008, 02:35 PM   #7
jey
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1995 Legacy Wagon

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Well I still don't have pictures but I have the valve out in the car so I went and took a look! The purge control valve that came with both my 2.2L and pulled from the 2.5L 98 Outback look exactly like your last picture, with the ridge on the top and the sides. That's probably the correct part - seems like the first part is a mistake or some weird mid-year part change - maybe the last owner ordered from that same place and got the wrong part...
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Old 07-14-2008, 03:38 PM   #8
Minjin
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99 Miata

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Well thats crazy. I found that picture purely by chance. If you or anyone else happens to have the time, could you read the part number off of it so I can verify thats what I need? Thanks for your help with this.
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Old 07-14-2008, 04:26 PM   #9
jey
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1995 Legacy Wagon

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There isn't a part number on mine. Is there a Subaru dealer near where you live? They could probably look up exactly what you need by VIN, so you can take into account any mid-year changes, and you have a place to take the part back to if it's wrong...
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Old 07-14-2008, 04:31 PM   #10
Minjin
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98 OB M/T
99 Miata

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Thanks anyway. I'm not to the point where I am ready to pay $85 or so for this valve that probably nearly never fails. I'm going to post a WTB along with that picture above...
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Old 07-22-2008, 12:38 PM   #11
Minjin
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99 Miata

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No one has an explanation? No one has ever encountered this before?
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Old 07-22-2008, 12:47 PM   #12
jey
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1995 Legacy Wagon

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My Purge Control Valve failed once, if that's what you're asking.
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Old 07-22-2008, 01:00 PM   #13
Minjin
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99 Miata

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No, I'm talking about how the manuals and parts lookups are wrong. And looking at the next year doesn't help.
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Old 07-22-2008, 04:14 PM   #14
fastenova
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Not your usual 1997
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Yeah, SOA is wrong often enough. So are parts houses. If you go to the dealership and ask for a timing belt tensioner, they only will sell you one type. In actuality there are two. The parts guys will sell you the wrong one, even with the correct VIN. Could be human error by the counter guy, or the guys who built the interchange/catalog data.

And Subaru switched a lot of parts mid-year. VC gaskets are a great example, I know of at least two different designs on the same year motor. I wouldn't be surprised if there was another. And parts are superceded all the time...
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Old 07-22-2008, 09:32 PM   #15
CarAids
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I had this same problem. Haven't fixed it.
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Old 09-27-2009, 03:20 PM   #16
supa74
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seems to be alot of purge valve issues
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Old 08-30-2011, 10:41 PM   #17
AWDSubieDoo
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Default

Bumping this for further info.

Had to replace the purge control solenoid valve on my 1998 Outback Limited wagon -- automatic, 2.5L EJ25D DOHC motor.

Gave my VIN to the local Subaru dealer parts counter folks, and they sold me Subaru purge control solenoid valve, part number 14774AA271, which was supposed to be the correct purge control solenoid valve for my VIN. But, when I tried to plug my harness connector into the replacement purge control solenoid valve, my factory harness connector plug was too SMALL to slip up onto the replacement purge control solenoid valve plug.

Took part back to Subaru dealer parts counter, and their Subaru parts guru got involved in sleuthing this out -- as he was looking on the computerized parts diagram, according to my VIN, he noticed that there was a SECOND recommended ALTERNATIVE purge control solenoid valve in SOME instances, for my VIN -- Subaru part number 16102AA080 was ordered (labeled VLV AY-DUTY SOL on box). This purge control solenoid valve harness plug has the correct SMALLER plug, and installed without any further problems.

Apparently, the purge control solenoid valve, part number 14774AA271, is designed to be mounted on the DRIVER'S side of the intake manifold, and has a slightly larger, different plug than the purge control solenoid valve, part number 16102AA080, which uses a slightly smaller plug, and mounts under the PASSENGER'S side of the intake manifold. Valve assemblies appear to be physically the same, just different harness plug connectors.

FYI for those folks who have run into this issue with the dealer's parts system not clearly showing the TWO possible parts of similar appearance, BOTH of which were used in the same year/VIN number range.

Easy to change -- took all of 5 minutes on a cold motor, and fixed my CEL error.

Last edited by AWDSubieDoo; 08-30-2011 at 10:58 PM.
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