Thread: 98 GP GT with a PO442 code and light on.

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  1. #1 98 GP GT with a PO442 code and light on. 
    SE Level Member Fritcr's Avatar
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    My "new to me" Grand Prix has a SES light on most of the time. Sometime it goes off and I have a code reader and have cleared it a couple of times but it comes back on. Any ideas what this might be. It says Evap Emissions Control Small leak or something like that. I was going to pickup a new gas cap at lunch today but I doubt that is what's wrong. I did some searches on the web and got some hits for other gm cars and things were mentioned like canistier leak and vac leak. I'll try to check out as much of that as I can.
    Thanks so much for everyone's help. I can do most stuff myself on my car but sometimes need a little guidence!
    Rob
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  2. #2 Re: 98 GP GT with a PO442 code and light on. 
    I live here. SyntheticShield's Avatar
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    Generally speaking, when that code pops up, the gas cap is the first thing to look at. If you replace it with a quality cap and the code remains, then its probably going to be elsewhere. A possible way to tell if it is the cap is to note whether or not the code comes on after such times as filling up with gas.

    It could be a vac leak I suppose but Id still start with the gas cap.
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  3. #3 Re: 98 GP GT with a PO442 code and light on. 
    GXP Level Member Zef_66's Avatar
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    I would start with the gas cap as well. And when replacing it, make sure that your filler neck is in good condition. One car I had, the gas cap was brand new. But the filler neck was rusted and not sealing well, giving me this code. Replaced the filler neck with a good one from the yard, and all was well.

    But like scotty said, could be a vacuum leak as well. But I would start with the gas cap.
    2001 GSE
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  4. #4 Re: 98 GP GT with a PO442 code and light on. 
    GTP Level Member Toasty's Avatar
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    just an FYI... if your car has the tethered cap, and you want to keep that, you have to go back to the dealer... who'da thunk that GM had a patent on a gas cap tether???
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  5. #5 Re: 98 GP GT with a PO442 code and light on. 
    I live here. SyntheticShield's Avatar
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    Quote Originally Posted by Toasty View Post
    just an FYI... if your car has the tethered cap, and you want to keep that, you have to go back to the dealer... who'da thunk that GM had a patent on a gas cap tether???

    You're kidding me right?
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  6. #6 Re: 98 GP GT with a PO442 code and light on. 
    GTP Level Member Toasty's Avatar
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    Quote Originally Posted by SyntheticShield View Post
    You're kidding me right?
    abso-friggen-lutely not


    new gas cap w/teather from the dealer for my regal was $25 bucks

    Fuel cap tether apparatus - US Patent 5462190
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  7. #7 Re: 98 GP GT with a PO442 code and light on. 
    I live here. SyntheticShield's Avatar
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    Well how about that.
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  8. #8 Re: 98 GP GT with a PO442 code and light on. 
    SE Level Member Fritcr's Avatar
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    Thanks guys, I have been traveling for my job and just got back. I have a rolled 98 Montana so I will take the cap off of it tonight and see if that helps. I would think it would be the same.
    Rob
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  9. #9 Re: 98 GP GT with a PO442 code and light on. 
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    my gp has the po442 code and is leaking coolant very slowly from the right side of my intake manifold by the throttle body. i am already planning on replacing the gasket and manifold but just wondering if this could be why the codes on. ive hear the code could be be a "vacuum leak at engine". would this be considered a "vacuum leak"?
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  10. #10 Re: 98 GP GT with a PO442 code and light on. 
    Turbo is the way to go. BillBoost37's Avatar
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    2000...if you post up a new thread of your own, it'll be much easier for us to address your questions.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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