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  1. #21
    GrandPrix Junkie Bronco Boy's Avatar
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    Default Re: Cat delete be too loud?

    Installed this 7 years ago and haven't seen P0420 since.....




    Google says it is around $180-225 in 'Merican Monies.
    Chris B
    2002 GT

  2. #22
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    Default Re: Cat delete be too loud?

    10-4, autozone sells them so I am going to go this route.

    I have already contacted ZZperformance to return the straight pipe and they said that will be fine.

    So this weekend I install the walker and see what happens. If I still have an issue I may try switching to Acdelco O2 sensors as I am running Bosch right now and have read mix reviews on those.

    thanks for the tip

  3. #23
    Rarely Here Anymore HighOctaneRacing's Avatar
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    Default Re: Cat delete be too loud?

    If the emulator worked for several years and then the code showed up again, that means the emulator is dead btw. You could've just got a new one but like other said tuning it out is the best way

    Sent from my VS995 using Tapatalk

  4. #24
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    Default Re: Cat delete be too loud?

    ended up installing a walker catalytic downpipe and so far so good. Its my wifes car and the performance increase is not a big deal to her. Also the increase in noise and smell was not something she was too excited about.

    Side note - I did notice that my long term fuel trim drop pretty much to 0.0 now as before it was slightly higher in the +2-4 range. I also noticed that the downstream O2 sensor never really goes above 0.8 volts where before it would.

  5. #25
    Killa Bee Scottydoggs's Avatar
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    Default Re: Cat delete be too loud?

    if you had your battery unhooked that cleared the pcm and its relearning, ltft will hit 0.0 when 40% or more throttle is given till the trims learn.

    the o2 voltage should dance up and down. never seen mine go past 8.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  6. #26
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    Default Re: Cat delete be too loud?

    Never unhooked the battery.

  7. #27
    Killa Bee Scottydoggs's Avatar
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    Default Re: Cat delete be too loud?

    the new o2 sensors might be forcing it to relearn. check em again in a week. might be different.

    im guessing you had codes? if you cleared the codes, you also reset the pcm. what clearing a code does.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  8. #28
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    Default Re: Cat delete be too loud?

    yeah, I cleared with my scanner.

    I'll give them a looksie this weekend

  9. #29
    Killa Bee Scottydoggs's Avatar
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    Default Re: Cat delete be too loud?

    there ya go. depending on how much you drive it, it could be learned in a day or so. i dont drive mine much so i just wait a week. once they read the same wot every time you know they are learned.

    im willing to bet on a stock tune your -15 idle and -12 wot cause thats where most who check theirs find it running. rich. why the cats clog i bet.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

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