Thread: 03 gt p0420

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  1. #21 Re: 03 gt p0420 
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    Yeah, gonna toss one in regardless and see what happens. Are they are to get too? For some reason I can't remember if I ever seen it while working on my car.
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  2. #22 Re: 03 gt p0420 
    Killa Bee Scottydoggs's Avatar
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    ever change your spark plugs? it pretty much block one in the back. you need a 7/8 th o2 socket to get it out too.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #23 Re: 03 gt p0420 
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    Yeah, had to undo the dog bones and rock the engine to get it. Same idea right?
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  4. #24 Re: 03 gt p0420 
    Killa Bee Scottydoggs's Avatar
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    i got to mine with out rocking the engine iirc. 2, 6 inch and a 3 inch extension was enough to make it up to the bottom of the cowl, and just over the sc, then i used a short pipe on the ratchet.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #25 Re: 03 gt p0420 
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    Thanks man, ill report back to this thread whenever I get around to putting it in. Since the downstream o2 is reading so stable I think the upstream o2 will fix my CEL.

    Thanks as always guys
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  6. #26 Re: 03 gt p0420 
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    One last question for ya Scottydoggs, when searching for topics on my problem I saw you recommended Walker cats. Are you talking about WALKER Part # 54627 from rockauto? Is that decent enough replacement unit if it turns out to be my cat?
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  7. #27 Re: 03 gt p0420 
    Killa Bee Scottydoggs's Avatar
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    for a stock replacement thats probably as close as it gets.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #28 Re: 03 gt p0420 
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    Quote Originally Posted by Scottydoggs View Post
    for a stock replacement thats probably as close as it gets.

    Well that's comforting lol. Hope the o2 sensor handles my issues.
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