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2008 Buick Enclave Question: I'm getting code P0496 after an emission's inspection was done on my car.



Neocg1, Friendswood, TX, December 29, 2011, 13:26

Could it be because they damamged something or lifted my car? I read about the code and its either the Vapor Canister or the Vapor Check Valve. Where are they located and how do you change them or know if they are needed to be changed?

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, December 29, 2011, 13:59

    To test the canister and evap system (if there is no visual mechanical damage or hoses knocked off), either the system requires a "smoke machine". Evaporative Emission system problems are difficult for anyone to diagnose/test and repair themselves at home. Some evaporative diagnosis requires a scan tool to bi-directionally control solenoids to seal off and open and test for leaks. Another useful tool is a machine that generates an inert gas/smoke that when the system is sealed off, if there are any leaks the smoke "show up" where they are. Also some faults can be intermittent and when the codes are erased the self test procedures your computer uses to test the system can take a week or two to self complete as a certain specific drive procedure has to be performed.
    There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online

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    Neocg1, December 29, 2011, 14:42

    Thanks for your answer Patrick, i will look into Alldata to see what they have to offer. I read on other sites about the hard start after fueling and read it had to do with the evap system or the canister could be holding excess fumes. Thanks again for your response.

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