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confusing po442 medium evap leak code


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Old 06-24-2011, 12:23 PM   #1 (permalink)
 
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Default confusing po442 medium evap leak code


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i have checked every square inch of the evap system. i even had a friend of mine hook up a diagnostic computer to see where the leak was coming from and he didnt find anything. i looked it up in the haynes service manual. it doesnt say much about it. it tells me that the fuel vapor canister could be the culprit.
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Old 06-24-2011, 12:29 PM   #2 (permalink)
 
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I have this same code and have for a few weeks now. It's annoying me because I can't find the leak.

As others suggested to me, check your gas cap. If it is loose or if the little gasket thing around the edge is erroded a little, it could be throwing the code.
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Old 06-24-2011, 12:30 PM   #3 (permalink)
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Fuel cap?
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Old 06-24-2011, 02:12 PM   #4 (permalink)
 
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I already replaced the fuel cap. Still getting the same code

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Old 06-24-2011, 02:54 PM   #5 (permalink)
 
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Its throwing a new code now. P0455 evap control system leak detected. (No purge flow or large leak)

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Old 06-24-2011, 02:58 PM   #6 (permalink)
 
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You probably have a dry rot crack in one of the lines back at the EVAP canister.
Also check PCV & Lines there.
Someone who has an auto smoke machine is necessary if cracked line cant be found.
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Old 06-24-2011, 03:11 PM   #7 (permalink)
 
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I had a similar problem recently. I had P0456 - small evap leak. These 2 vacuum lines had some etched and cracked spots on them (right where the arrow is pointing).



There was a definite hole in each of those plastic lines. Here is the short section that I cut out of each of them.


Here is a pic of them after splicing with rubber vacuum hose. 5/16" and 7/16" hose worked perfect for a good snug slip fit over the existing plastic tubes. Should not have any leaks (at least here any more)


Problem solved for me. Check your lines and see. There is also a small similar line under the Jeep in the rear headed to the gas tank. Check there for cracks too.
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Old 06-24-2011, 04:12 PM   #8 (permalink)
 
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I replaced all those hoses the last rime i got the p0442 code and that fixed the problem for about 2 months then i got the cel for the same code last week couldnt find where the leak was coming from. So i just cleared it and now it came back yesterday

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Old 06-24-2011, 04:18 PM   #9 (permalink)
 
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Did you check the hose back by the gas tank?
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Old 06-24-2011, 05:14 PM   #10 (permalink)
 
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Yea that one was good but i replaced it anyways to make sure.

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