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evap help/explanation wanted


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46hemi
New User

Jul 10, 2012, 5:56 AM

Post #1 of 10 (1458 views)
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  post locked   evap help/explanation wanted  

First thanks to anyone who can lend a hand. This problem is driving me crazy and I just hate when I can't figure something out.

I have an 06 Dodge Ram srt-10. It has less than 10k miles. It is a regular cab with a 6speed manual trans.

Here it goes: After letting the truck sit for a few weeks it throws a check engine light. I read the code and its a 0455. I first replace the cap with a new Mopar one. I reset and it comes back. I did a visual inspection and found the hose which comes off the evap canister has been chewed by a mouse. I cut out the bad section and replace - reset the code and think I am good to go....wrong! During the drive cycle period it shows a 0442 and a 0455, once past the cycle only the 455 remains. I have visually inspected all of the lines I can get to (have not dropped the tank) but all looks OK. I have tried to read all I can about how the system operates but I guess I am still a bit lost on a few aspects. What I have noticed is that if I clear the codes I can drive all day, multiple start ups and conditions and I will not see any pendings. When I let the truck sit overnight, start it and let it idle I will smell a faint gas odor after idling for a minute or so and after that I see pending 0452/0455. I know the system performs different tests under different conditions so I am wondering if this cold start idle condition would provide a clue where the problem may lie.


(This post was edited by 46hemi on Jul 10, 2012, 6:57 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 10, 2012, 6:26 AM

Post #2 of 10 (1432 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

Do you have a smoke tester and a professional scan tool? Because if you don't, you are just wasting your time.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



46hemi
New User

Jul 10, 2012, 6:42 AM

Post #3 of 10 (1422 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

Thanks for the reply. I do not have a smoke tester, nor do I have a professional scan tool. I guess I was looking for a bit of an education on how the different diagnostic evap tests occur in the truck as well as if any of these symptoms align with any particular component.

I have been testing with a Mighty-Vac to this point (I figured if I was looking for a large Evap leak, then by isolating portions of the system and looking for pressure drops I would know if it were a bad hose etc which seem to be the most common causes of this code). I thought perhaps given the symptoms someone may be able to shed light on what test occurs during the cold start idle. If its just a wild goose chase then I am happy to raise the white flag and bring it to a repair facility.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 10, 2012, 6:51 AM

Post #4 of 10 (1416 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

For what it's worth - this is rodent damage, sets a code, you smell fuel so there's more to it. Who the heck knows what a mouse/rodent finds interesting to chew on?

T
_________________________________________
Long retired now


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 10, 2012, 7:02 AM

Post #5 of 10 (1398 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

You can be spinning your wheels for a long time that way. You need the scan tool to energize the solenoids to seal off the system for the testing and you need the smoke machine to find the problem. It could be a solenoid not sealing all the way, a problem with the fuel tank itself or even a gas cap seal on top of any of the rubber hoses that could have damage.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



46hemi
New User

Jul 10, 2012, 7:09 AM

Post #6 of 10 (1382 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

Sounds like its best to bring it in. Thanks to all who replied.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 10, 2012, 7:41 AM

Post #7 of 10 (1367 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

I think that's best. At same time check for other assorted possible damage. Where ever this is parked if with fuel odor I'd put this outdoors if indoors now.

Had a whole thread on how to stop this problem with a wild assortment of ideas now a long time ago but here somewhere. Moth balls, rat poison bags when practical, sonic devices, not parking it in same position seems to help. Good luck with fix and preventing it from happening again,

T
_________________________________________
Long retired now


46hemi
New User

Jul 18, 2012, 7:11 AM

Post #8 of 10 (1244 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

Just thought I would update this thread in case anyone stumbled upon it in the future trying to fix a similar issue. It seems I have the problem fixed now. Considering the fact that I was getting a p0455 large leak, I was still thinking that the damage should be able to be spotted by a visual inspection. Using my Mighty Vac I was able to determine that the leak pointed from the canister rearward, towards the gas cap. I had already replaced the gas cap so I knew that was good. The only part of the system which I was not able to visually inspect was above the tank. I ran the tank low (a very easy task with this motor) then dropped it. sure enough thats where the leak was. It was easy to spot once the tank was down. Replaced with new hose and good to go. Thanks to all for the help.


(This post was edited by 46hemi on Jul 18, 2012, 7:17 AM)


dobbsgretta
New User

Sep 15, 2012, 9:13 PM

Post #9 of 10 (1046 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

I have a 300 and check engine light came on and the error code was p0456. EVAP purge system small leak I am hoping when I start my car in the morning the light will not still be on. I had to spend almost 1,000.00 to fix the fly wheel and they told me I had to replace the starter. I am sick of putting money in this car.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 15, 2012, 10:22 PM

Post #10 of 10 (1044 views)
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  post locked   Re: evap help/explanation wanted (long) [In reply to]  

Again, please start your own question




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





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