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  1. #1
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    Default I have an EVAP code on a Grand Prix 2007.

    Hello All, I am looking to repair my EVAP system as it keeps coming up with a GAS CAP error. I have replaced it and replace the valve at the engine. I am in need of a diagram of the EVAP system. I also am looking to find out where the evap canister is.

    Thank you for your help in advance.
    Rhys

  2. #2
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    evap canister is by the gas tank on the drivers side. Check your vapor lines and all hoses for cracks.
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, DIY ported heads, 90# springs, rollmaster single timing chain, fuel pump rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  3. #3
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    would that have anything to do with a 420 code?

  4. #4
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    NO thats cat efficiency
    Bad o2, or bad cat. you could try a bottle of Mr. Gasket Cataclean
    Proper diagnosis is needed. Scanner readings on upstream O2 should be above 0.800 and below 0.200mv to much activity on back O2 might be reason. Also watching MAF readings, and misfire codes/readings.
    Also take a look at Long Term and short term fuel trims.

  5. #5
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    Thank you ...Just grasping at straws at this point...

  6. #6
    Donating Users industrialfish's Avatar
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    What gas cap did you get? When my gas cap broke, the "2004+" cap I got from AutoZone kept throwing a code. A little research found that 2004 caps are not always compatible and their was a different part number for 2005.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset

  7. #7
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    from rock auto
    ACDELCO12F64{#19137297}Standard; w/o Groove For Tether
    ACDELCO GT283 {Click Info Button for Alternate/OEM Part Numbers} Black GM Original Equipment
    then Locking:
    ACDELCO 12F40L {#19137302} Locking; w/o Groove For Tether
    ACDELCO 12F40LA {#19137303} Professional
    At least being AC Delco they have a chance of being proper ones.


  8. #8
    Donating Users industrialfish's Avatar
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    Default Re: I have an EVAP code on a Grand Prix 2007.

    And that's what I'm talking about. The first 3 have 3 different lengths to them. 2.0 inches, 2.4 inches and 2.5 inches.

    .1 inch likely makes no difference, but half an inch sure might.

    Did you save your old one? Measure it against your new one. Or if your new one is 2.4/5 inches buy the 2 inch one.

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