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P0455 P0442 evap evaporative emissions leak fix

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Old May 21, 2012 | 03:59 PM
  #31  
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Originally Posted by BCredram
havin problem with EVAP, computer says large leak, have smoke tested 3 times no leak have replaced all parts under hood and gas cap exhaust is all bolted together in front of converter. where do i go next? thanks
A little info like all of it, about your truck added to your sig and profile might be helpful.
 
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Old May 21, 2012 | 04:02 PM
  #32  
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And btw, if anyone needs or wants the correct "u" shaped hose, PM me.

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Old May 21, 2012 | 05:48 PM
  #33  
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how did you go about smoke testing it? a shop or a homemade rig? i heard if you have a large leak it can take out the pump. anyone know if thats true? and did you reset the pcm?
 
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Old May 21, 2012 | 06:09 PM
  #34  
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please explain smoke test
 
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Old May 21, 2012 | 10:24 PM
  #35  
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Pressurize vacuum system with smoke. Makes finding leaks really easy. Supposedly.
 
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Old May 23, 2012 | 11:18 AM
  #36  
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sorry I have a 01 ram sport 360. the shop smoke tested it and replaced one part under the hood said it was bad reset everything for inspection 2 days later light came back on so took it back. they smoke tested again and said the second piece under the hood had to be replaced so replaced that. day and a half later light on again both times it said a large evap leak. smoke tested the fuel tank with no leak and retested whole system from under hood again with no leak. dodge place said if exhaust was unhooked before converter would make it say large leak that was all good when checked. they reset check engine light 2 days later light come back on but was weekend so just drove it. on monday light went out so took it up they put computer back on it but it said the O2 sensor and the evap had still not reset. so i guess where do i go from here? also said they had never had one that took so long for everything to reset.
 

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Old May 23, 2012 | 01:58 PM
  #37  
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Check the hoses/lines for the evap system. They like to dry rot, and crack.....

Which O2 sensor was it whining about?
 
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Old May 23, 2012 | 08:57 PM
  #38  
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i asked which sensor but they could not tell me never found any leaks in the lines. I took it back up today because the light was still out and everything checked out fine with it and it passed inspection. maybe it just don't like me or somethin!!
 
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Old May 24, 2012 | 10:10 AM
  #39  
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PCM needs to log miles and cycles after it gets its codes cleared
 
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Old May 27, 2012 | 09:34 PM
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I'll tell you how the evap system works so you can better trouble shoot. A large leak is generally a bad gas cap,but not always.

The Evap system is for vapor recovery,but the system check is done by the computer by acctually pressurizing the gas tank to 1psi. This first checks to see if there are any leaks,hence the gas cap being bad won't hold the pressure if the check valve is bad.

The way the computer knows if there is a leak or not is by counting the number of pump pulses it takes to pressurize the tank at a given fuel level off of the fuel level sender. A bad fuel level sender or one that reads incorrectly at a couple spots will cause a leak code also

i got this info from an older post, i have checked all the lines so i guess i will go ahead and replace the pump because i have been living with a flakey gauge for some time
 
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