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  #1  
Old 09-11-2009, 10:17 PM
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Need help on evap problems

Not sure if right forum (sorry)

2 codes throwing CEL (even if turn it off they come back)

Code 442 and 445. For evap.

What needs to be fixed/ looked at? And where is it? (thing under bed?)

Its a '01 I believe Dak sport w/ 4.7 - 2 wheel drive-(friends)

Thanks guys
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  #2  
Old 09-11-2009, 10:43 PM
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You may need to replace all of the 5/16" and 1/4" vapor hose under the hood and at the gas tank/charcoal canister (under the driver's seat inboard of the left frame rail). I had to replace all this on my Dakota to get rid of recurring P0442s. I used fuel hose instead of vapor hose: it's a lot tougher, shouldn't develop cracks because of the heat.

There is a kit sold at the Dodge dealer (evap hose kit for Dakota and Durango) that has the two curved hoses for the canister - it beats trying to get a straight hose to fit without kinking it. It costs around $10.
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Old 09-12-2009, 06:05 AM
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Quote:
Originally Posted by modain View Post
You may need to replace all of the 5/16" and 1/4" vapor hose under the hood and at the gas tank/charcoal canister (under the driver's seat inboard of the left frame rail). I had to replace all this on my Dakota to get rid of recurring P0442s. I used fuel hose instead of vapor hose: it's a lot tougher, shouldn't develop cracks because of the heat.

There is a kit sold at the Dodge dealer (evap hose kit for Dakota and Durango) that has the two curved hoses for the canister - it beats trying to get a straight hose to fit without kinking it. It costs around $10.
Hmmm so just replacing hoses?

What exactly is the evap system?

Thanks
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  #4  
Old 09-13-2009, 11:06 PM
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My truck throws a evap code every once in a while. I reset it and it stays off for a couple weeks, I dont think its anything to worry about in my case. Gas cap tight?
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  #5  
Old 09-13-2009, 11:09 PM
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i have seen aftermarket locking gas caps that cause that prob as well
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Old 09-14-2009, 12:15 AM
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open the hood and look on the right hand side (driver side) as I told you before, locate the little green cap that is where they smoke test it and start checking ALL the hoses in and around that area for cracks or splitting. I have replace 5 hoses for the evap system already, they tend to just crack and split after a while. It wont hurt the truck to just ignore the light, but in most states a CEL is an immediate emissions fail. Also you might see your mpg go down a bit too.

I wouldn't recommend just shutting it off and ignoring it, lol really not a great idea, just find the hose and fix it.
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  #7  
Old 09-14-2009, 12:33 PM
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All good advice, but your best bet is to check the evap canister under the driver, just inside the frame rail. As mentioned earlier, there is a kit at the dealer for this because it is such a common issue...
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Old 09-14-2009, 05:40 PM
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Quote:
Originally Posted by PIXER View Post
Hmmm so just replacing hoses?
Yes. P0442, P0455, P0456 are all differing levels (sizes) of leaks detected in the evaporative recovery system. P0445 is much more: it's a problem with the evap purge control valve. Are you sure the P0445 you cited was really a P0455? P0442/P0455 often reported together for for me.
Quote:
Originally Posted by PIXER View Post
What exactly is the evap system?
It's a series of hoses plumbed into the fuel system for the purpose of capturing hydrocarbon vapors as the gasoline in the tank evaporates. Something about unburnt hydrocarbons in the atmosphere being a bad thing...

At key-on the evap system pressurizes (Leak Detection Pump is energized), and depending upon how long it takes to hit the target pressure the PCM figures there is a leak somewhere of a certain size and will trip the code/CEL according to the severity of the leak. Cracked vapor hoses are the usual suspect and will compromise the sealed system, allowing air/vapor to escape. A faulty gas cap can do it. These are cheap and easy fixes. If the purge solenoid, LDP, or charcoal canister are leaky it'll trip the same codes, but be more costly to correct.
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