EVAP Canistor Problem HELP?!?!??! - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 13 (permalink) Old 02-19-2013, 10:06 AM Thread Starter
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Smile EVAP Canistor Problem HELP?!?!??!

2009 cobalt, non turbo. CEL had evap canister code, so I replaced it and the fuel filter just because. Reset ECU, still throws the same code and also gets horrible gas mileage, replaced the gas cap as well and still nothing same code being thrown and still horrible gas mileage. Throttle body went bad months ago, i put a ebay used one on and the car ran fine after the re learn process and has been fine since, until now and new canister, new fuel filter and new gas cap and same CEL codes and gas mileage just keeps getting more worse. What else would through that code and what should i do to fix it!? gas is to expensive to keep dealing with this lol thank you.
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post #2 of 13 (permalink) Old 02-19-2013, 10:09 AM
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What's the code?

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post #3 of 13 (permalink) Old 02-19-2013, 02:36 PM Thread Starter
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its P0496
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post #4 of 13 (permalink) Old 02-20-2013, 04:06 AM
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po496

purge solinoid ?

2009 cobalt ss,k&N typhoon intake, short shifter,tuned cat-back exhaust, jet black.
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post #5 of 13 (permalink) Old 02-20-2013, 04:15 AM
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Yeah purge solenoid or split hose at solenoid. Does it start hard after fill-up?

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post #6 of 13 (permalink) Old 02-20-2013, 09:45 AM Thread Starter
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I replaced the whole evap canister, that lil sponge was full of dust cleaned it the best I could. Whats the best way to clean that besides just beating the dust I out of it? Also the evap lines put up a fight to get off lol but it all went back together smooth. At first every time we'd fill up, start the car to leave, it won't start just cranks until you pump the gas, then it would idol rough for a couple seconds and then no problems at all until thd next fill up, besides poor mpg. Had to replace the TB with a ebay one last year and it worked fine, not sure if mass air flow sensor or something possibly and nothing to do with the evap or not. On alldata when we looked up the code it also had other codes that would throw the evap code but just kinda got stuck lol. Do you have to relearn everything just after a evap canister change or what am I missing?
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post #7 of 13 (permalink) Old 02-20-2013, 10:57 AM
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Your problem is not the evap canister it's your purge solenoid mounted on the engine.

https://www.yourcobalt.com/forums/pro...-solenoid.html

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Last edited by Coby7; 02-20-2013 at 10:59 AM.
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post #8 of 13 (permalink) Old 02-20-2013, 04:41 PM Thread Starter
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Purge solenoid in the engine, that easy huh lol. I hope so, never looked into it. But ill put one on tomorrow and let you know. That would kill gas mileage as well right?
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post #9 of 13 (permalink) Old 02-20-2013, 06:38 PM
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Well when you have a check engine light on the ECM falls on default settings. If you change the purge solenoid and it clears your code then your ECM will read sensor values and trim fuel mixture accordingly.

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post #10 of 13 (permalink) Old 02-21-2013, 11:29 AM Thread Starter
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Sweet sounds good enough for me ha. Ill know tomorrow if its good or not so we'll see thanks man
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