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Thread: CX-9 hard to start after fillups

  1. #1
    Registered Member

    Mazda CX-9 2012 Grand Touring

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    Dec 2017
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    Boerne, TX
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    CX-9 hard to start after fillups

    My 12 CX-9 has a hard time starting each time I fill it up. I have to crank it for a few seconds to get it to starts. Then it won't stay started the first couple of times. Finally I rev it up and get it in gear to leave the station. Also, it has stalled a couple of times when traffic comes to a stop. And at a stop light, sometimes the tach moves around a bit other times steady. The check engine light came on for a day after it stalled twice. Had the code read. The guy at O'reilly, https://www.oreillyauto.com/, said both O2 sensor banks were showing the car is running rich or tricking it to run rich.

    I read on the web that the hard starting after fill ups could be due to the purge valve being stuck open letting fumes into the cylinders.

    Has anyone had experience with these issues? I'm going to take it to the shop Monday.

    112K miles, owned for less than a month

  2. #2
    Registered Member CJ4's Avatar

    Mazda CX-9 Signature 2018

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    Quote Originally Posted by goodtexan View Post
    My 12 CX-9 has a hard time starting each time I fill it up. I have to crank it for a few seconds to get it to starts. Then it won't stay started the first couple of times. Finally I rev it up and get it in gear to leave the station. Also, it has stalled a couple of times when traffic comes to a stop. And at a stop light, sometimes the tach moves around a bit other times steady. The check engine light came on for a day after it stalled twice. Had the code read. The guy at O'reilly, https://www.oreillyauto.com/, said both O2 sensor banks were showing the car is running rich or tricking it to run rich.

    I read on the web that the hard starting after fill ups could be due to the purge valve being stuck open letting fumes into the cylinders.

    Has anyone had experience with these issues? I'm going to take it to the shop Monday.

    112K miles, owned for less than a month


    Pull Codes. If you see codes related to the EVAP system, it could be that you have overflowed the tank one too many times during refueling, causing problems with the charcoal canister or the charcoal pellets inside the canister (to be more precise). Could be a clogged charcoal canister, or yes - the purge value solenoid could be faulty. Again, check for codes related to the EVAP System.

  3. #3
    Registered Member

    Mazda CX-9 2012 Grand Touring

    Join Date
    Dec 2017
    Location
    Boerne, TX
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    6
    Quote Originally Posted by CJ4 View Post
    Pull Codes. If you see codes related to the EVAP system, it could be that you have overflowed the tank one too many times during refueling, causing problems with the charcoal canister or the charcoal pellets inside the canister (to be more precise). Could be a clogged charcoal canister, or yes - the purge value solenoid could be faulty. Again, check for codes related to the EVAP System.
    I had it checked and they did say the canister and purge valve needs replacing. Is that something than can be done at home? I do my own brakes, oil and other maintenance.

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