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OBD code P440
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Rob9c1
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PostPosted: Mon Jan 02, 2006 7:03 pm    Post subject:  OBD code P440 Reply with quote

SO my check engine light has come on recently. The code that my reader extracted was a p440 "P0440 Evaporative Emission Control System Malfunction"

I was told that the cause could be a faulty fuel cap, that was replaced and the code has been cleared yet, the code still turns up.

I would appreciate any advice or comments in regards to this matter.
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bbengineer
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PostPosted: Mon Jan 02, 2006 7:34 pm    Post subject:   Reply with quote

That''s a LARGE Evap leak code..

Check the vacumn lines to/from the EVAP canister. Check the EVAP canister purge valve & solenoid...

I''d bet it''s a broken vacumn line...

BBEngineer

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Rob9c1
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PostPosted: Mon Jan 02, 2006 9:51 pm    Post subject:   Reply with quote

bbengineer wrote:
That''s a LARGE Evap leak code..

Check the vacumn lines to/from the EVAP canister. Check the EVAP canister purge valve & solenoid...

I''d bet it''s a broken vacumn line...

BBEngineer


Could a problem such as this have a hand in my car having poor fuel milage? ive been noticing the decline around the same time the light came on.
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bbengineer
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PostPosted: Mon Jan 02, 2006 10:15 pm    Post subject:   Reply with quote

Absolutely... A problem w/ the EVAP system will chew away at your MPG...

BBEngineer

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Rob9c1
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PostPosted: Mon Jan 02, 2006 10:28 pm    Post subject:   Reply with quote

bbengineer wrote:
Absolutely... A problem w/ the EVAP system will chew away at your MPG...

BBEngineer
.

hmm, thank you very much for your help. I will look up some service manuals online and check for the position of the evap canister and check all the associate hoses.
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MyDvd7MD
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PostPosted: Tue Jan 03, 2006 11:16 am    Post subject:   Reply with quote

I had that code shortly after we bought the 2003 Blazer and it turned out to be a bad purge solenoid. And bbengineer is right it will kill your MPG. And if the purge canister gets damaged you could get raw fuel in the canister. And you don''t want that. ''82 K-5 Blazer did that. Vehicle ran like s**t and blew black smoke.

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aresf11
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PostPosted: Thu Oct 04, 2007 12:22 am    Post subject:  Where are these parts? Reply with quote

Would somebody mind checking a manual for me?

2003 base model, would like to know location of and how to access:

Evap canister (same as charcoal canister?)
Canister purge valve
Canister solenoid

I'm throwing the ol' P0440. I was filling up at a VERY slow pump the other day, so slow that the valve didn't shut itself and gas started spewing out of the tank. I have a feeling that might be the culprit. Dang you, Pilot Travel Centers!
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aresf11
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PostPosted: Fri Oct 12, 2007 2:33 am    Post subject:   Reply with quote

no?
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bigrod118
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PostPosted: Fri Oct 12, 2007 4:13 am    Post subject:   Reply with quote

The EVAP can is right behind your fuel gas cap, behind the rear bumper, tucked up high, literally, right behind/next to the fuel door.

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aresf11
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PostPosted: Sat Oct 13, 2007 10:17 pm    Post subject:   Reply with quote

Awesome thanks. So, probably not an easy fix then? Will taking out the fender cover allow access?
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bigrod118
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PostPosted: Sat Oct 13, 2007 10:20 pm    Post subject:   Reply with quote

It's easy enough to access, I only know it';s there because I saw it while doing some other work back there and looked up. as long as you put the rear of the car up on ramps or on jack stands, you should have no problem finding it or servicing it.

Plus you can't remove the rear "fenders" Wink , which are actually rear quarter panels.

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aresf11
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PostPosted: Sun Oct 14, 2007 1:29 am    Post subject:   Reply with quote

haha, yeah yeah. Thanks for the info; I'll see what I can do with it and report back.
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PostPosted: Sat Nov 24, 2007 7:34 pm    Post subject:   Reply with quote

.... any luck on this???
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aresf11
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PostPosted: Sun Nov 25, 2007 9:15 pm    Post subject:   Reply with quote

Replaced the gas cap and it's still popping up, so I'm going to replace the solenoid next.
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aresf11
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PostPosted: Sat Dec 01, 2007 12:20 am    Post subject:   Reply with quote

Guy at autozone today told me that after replacing the gas cap, even if you clear the code, it could take up to 50 cycles for the diagnostics to realize the problem is fixed (if that's all I needed) and that I should just keep clearing the code when it comes up for at least a month. That sounded downright ridiculous to me, so I went to Murray's, and they suggested that code P0440 was my O2 sensor...again, WTF?

Regardless, along with my P0440, P0420 (cat efficiency), as of two days ago, has started to pop up. Guy at autozone said that 0440 describes a big evap system leak and 0420 describes a small evap leak. Once again, I don't think that's right. I thought 0420 was just for the rear O2 sensor, which I have simulated, so I'm thinking my simulator might be bad. I got it from ZZP, so I"m going to call them up and ask.

In the meantime, should I really be waiting for 50 drive cycles or was that guy just a moron and I should try the solenoid/look for leaks in vacuum lines next? How many lines are involved in the evap system? Only the ones back by the gas tank? Some under the engine bay? As always, the help is much appreciated.
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