Thread: 99 GP GT PO440 problem

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  1. #1 99 GP GT PO440 problem 
    99grandgt
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    Thumbs up 07-22-2012
    I have a 99 GP GT that is throwing a PO440 code. I have a week before I take a trip from Ohio to Virginia. I ordered a new gas cap from rockauto.com. My only real question is, if I leave and the light comes back on during my trip will this code hurt the car or just my mpg?

    Hopefully the gas cap can fix the problem!!!
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  2. #2 Re: 99 GP GT PO440 problem 
    dsmuts
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    Default 07-22-2012
    It won't hurt anything it's just emissions stuff i believe. Where are you in ohio?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: 99 GP GT PO440 problem 
    Fivefingerdeathpunch
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    Default 07-22-2012
    I would check over all your evap lines, maybe one is cracked.

    And replacing the gas cap like you are doing could be the cause aswell.

    SMGPFC Member #1
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