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Old 03-11-2008, 07:33 PM   #1
kpalena
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Default CEL help

Car threw a cel a while back. Went away. Came back shop read it as "evaporative emissions" they cleared it and said it was probably the gas cap. It came back again today. Where else should I be looking?
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Old 03-11-2008, 07:41 PM   #2
surowrxa
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There are a few evap codes, if it was the 440 it can be your entire system: the (gas cap &) fuel filler pipe to the gas tank, including the charcoal canister. This code signifies a leak in the system, and can detect a hole the size of a pinhead.
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Old 03-11-2008, 09:17 PM   #3
evilundisguised
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Not to threadjack, but I also have an evap code, P0446, evap vent solenoid circuit condition. I'm guessing this is the evap valve or connector, but where is this thing located?
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Old 03-12-2008, 12:05 AM   #4
kpalena
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Quote:
Originally Posted by surowrxa View Post
There are a few evap codes, if it was the 440 it can be your entire system: the (gas cap &) fuel filler pipe to the gas tank, including the charcoal canister. This code signifies a leak in the system, and can detect a hole the size of a pinhead.
ish....I have to get under the car to see that don't I?
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Old 03-12-2008, 09:02 AM   #5
hcsi99
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Evap codes are a pain! Evap problems can be very intermittent and if not acting up at the time of inspection or diag can be a guess as far as the problem. I know the dealer I work for has a tool that puts smoke into the evap system and helps to find a leak. The only problem with that is if it is a evap valve sticking it may not stick all the time. The best thing to do before throughing a bunch of parts at your car would be to call the dealer and see if someone can tell you if there is a common problem maybe even get it checked out for a fraction of what if could cost you to guess. Good luck
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Old 03-12-2008, 09:55 AM   #6
surowrxa
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Quote:
Originally Posted by hcsi99 View Post
Evap codes are a pain! Evap problems can be very intermittent and if not acting up at the time of inspection or diag can be a guess as far as the problem. I know the dealer I work for has a tool that puts smoke into the evap system and helps to find a leak. The only problem with that is if it is a evap valve sticking it may not stick all the time. The best thing to do before throughing a bunch of parts at your car would be to call the dealer and see if someone can tell you if there is a common problem maybe even get it checked out for a fraction of what if could cost you to guess. Good luck
Smoke test (after ruling out gas cap. Borrow another OEM one if you have to) is the best way to find a leak.

Quote:
Originally Posted by kpalena View Post
ish....I have to get under the car to see that don't I?
This is the easy part you can do. There are a couple lines to the charcoal canister, check and make sure one did not get bumped off. It's the black box under the passenger rear. Other than that, sniff around down there. If this is for your '06 WRX it shouldn't be something really involved. How did you come to the conclusion your cap is good?
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Old 03-12-2008, 11:29 AM   #7
kpalena
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I have not ruled out the cap yet, but I also don't have a clue how to test it. Also the light was on for a couple days, then went off. Sometimes it will stay off for a week or so, then come back on. I will try to rule out the filler neck and the canister lines tonight.
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Old 03-12-2008, 12:19 PM   #8
hcsi99
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You can buy or like surowrxa said if you know someone with a good cap switch it out
for a week and see what happens. I can tell you that I see cars that have intermittent
evap leaks that only act up if the car has a 1/4 tank of gas. The car will only runs a self test every few drive cycles, the engine will have to cool off then warm back up a few times before these test are ran. Very hit or miss good luck!
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Old 03-12-2008, 06:05 PM   #9
kpalena
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Thanks guys....I hate this in an 18 month old car.
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Old 03-12-2008, 06:12 PM   #10
hcsi99
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Is your car still under warranty? The 3 year 36? If so take it to the dealer.
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Old 03-12-2008, 07:52 PM   #11
kpalena
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Nope 39k...sucks. It is like my warenty exparation light.

Where is this "valve". I checked as many lines as I could...everything looks kosher. No gas smell.
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Old 03-12-2008, 09:19 PM   #12
surowrxa
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Quote:
Originally Posted by kpalena View Post
Where is this "valve". I checked as many lines as I could...everything looks kosher. No gas smell.
With nothing (noticably) wrong down there, I would bet it's your gas cap.

It's not much to get a new OEM one, I got one for the Forester from Pelham on eBay for $12 shipped. My Forester had a PO440 for the fuel filler pipe having a pinhole. The valve on the neck was rusted to it, so I replaced that too. My situation ended up not being the cap, but I think your cap just has a bad seal. Just a guess, but for an '06 it's the cheapest guess.
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Old 03-12-2008, 11:28 PM   #13
kpalena
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Word...cleared the code...cleaned the cap seal. Made sure it was tight. No code tonight. If it holds over the weekend, that was probably it. Thanks for the help fellas.
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Old 10-23-2010, 08:02 AM   #14
jeromes
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Exclamation I know this is a old thread but I had to replace the fuel filler pipe

Posting this in hopes to help others.

I just replace the fuel filler pipe on my 1998 Forester and my 2001 Forester. Both were throwing the Evap leak code. Dealer said that the fuel filler pipes are know to rust through and cause the code. YEP the Dealer was correct. Both pipes had rusted close to the top of the pipe. Why did they rust you might ask! Crappy design of the fuel pipe cover (plastic cover over pipe). On the 2001 there was so much dirt packed up around the fuel filer pipe that I had 1/4 lb of dirt fall out when I took the cover off. The small square "Breather Shut Valve, P/N 42084AE100" was rusted away (gone). The pipe cover has an opening at the top facing towards the tire that will let road grime (salt) into the cover and pile up on the pipe.

On the 1998 there was no Breather shut valve, but the pipe had rusted through in a number of places.
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