Thread: Running Rich 04 GTP

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  1. #1 Re: Running Rich 04 GTP 
    GXP Level Member Turbocharged400sbc's Avatar
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    and it wont damage the cat. the PCM is correcting the hardwritten tables by removing fuel (it will go to 44% change after it hits the 22% "wall" for long enough) to keep the mixture at stoiciometric.

    keep in mind that the TPC/MAP(and baro)/MAF and O2 are "trusted" sensors, so the pcm ASSuMEs they are correct even when they may be skewed by age/contamination.

    the O2 is the primary datapoint for trims....so make sure its good.
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  2. #2 Re: Running Rich 04 GTP 
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    Thanks for the advise. It's all AC Delco sensors with NGK plugs on a stock tune. It was running rich before and after the sensors were replaced so I don't think it's related to one of the sensors. I didn't notice any exhaust leaks but I'm going to pull the front P log and inspect it for any cracks since those were a bit notorious for cracking at the welds.
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