Thread: New Cat Problems

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  1. #1 New Cat Problems 
    GT Level Member Mitchstrp's Avatar
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    So my grand prix was straight piped for quiet sometime and my check engine light was always on for the o2 sensor, i just had the cat installed and the o2 sensor and my check engine light went off then came back on and continues to do so, i went and got it scanned and it said it was an o2 sensor. my friend said this happened to him already and is normal.. is this normal or is something wrong
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  2. #2 Re: New Cat Problems 
    I GIVES MONIEZ JoshsGTP's Avatar
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    NO not normal need a new friend lol, The new cat might be too small
    Red GTP coupe, Intake, Poly Dogbones. 8K HID's, Headers, DIY HUD, Aeroforce Scan Gauge,Kenwood Excelon KDC-X794, MSR 045 18" rims, Borla Cat-Back.

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  3. #3 Re: New Cat Problems 
    GT Level Member Madness's Avatar
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    I know of a few people that have installed "aftermarket" cats. Apparently, they don't quite do a good enough job and the computer throws the code. They just put black tape over the light.
    Favorite Quote: You can't fix stupid!!


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  4. #4 Re: New Cat Problems 
    The Blue One blueguy's Avatar
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    If it is a universal or high flow, they will still trip the code...IMO, I woulda just left it out so you could always rule out a converter as an issue.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  5. #5 Re: New Cat Problems 
    The mod from over yonder TheOtherNick's Avatar
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    Yeah some universal or high flow cats will set the code. Put a spark plug non fouler around the 02 and it should fix your problem.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  6. #6 Re: New Cat Problems 
    The Blue One blueguy's Avatar
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    That's a big thing in the foreign car world, especially BMW and Audi from what I've read...it works and its cheap.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  7. #7 Re: New Cat Problems 
    GT Level Member Mitchstrp's Avatar
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    yeah, i had to put a cat on because the first owner didnt have one and noone would pass my inspection and it is an aftermarket cat and the code is now gone, does the computer just self adjust to the cat or am i an idiot?
    1.8 RR's, Speed daddy headers, 180 stat, Open Cone, GBP tune, 3.5 pulley, and ported blower.
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  8. #8 Re: New Cat Problems 
    The Blue One blueguy's Avatar
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    When it adjusts you know...because the code will either be on or go off.

    Like stated...high flows sometimes flow too good for the rear o2 to believe there is a converter there so it does throw a code. But who needs a rear o2 anywayz
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  9. #9 Re: New Cat Problems 
    GTX Level Member Biohazed's Avatar
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    Had this on my GT after I Installed a ZZP Catted Downpipe ... just had the code set to no report ... problem solved
    *image too tall*
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  10. #10 Re: New Cat Problems 
    GT Level Member Mitchstrp's Avatar
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    well in my state to pass inspection you must have a rear o2 sensor to pass so, thats why i have one, i was straight piped for the longest time and i may go back that way very soon.
    1.8 RR's, Speed daddy headers, 180 stat, Open Cone, GBP tune, 3.5 pulley, and ported blower.
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  11. #11 Re: New Cat Problems 
    The mod from over yonder TheOtherNick's Avatar
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    Blue is from the same state as you.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
    SMGPFC Two Nipple General
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  12. #12 Re: New Cat Problems 
    GT Level Member Mitchstrp's Avatar
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    oh didnt even notice, yeah blue your pretty close to me, my buddies dad runs a golf course in liberty.
    1.8 RR's, Speed daddy headers, 180 stat, Open Cone, GBP tune, 3.5 pulley, and ported blower.
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  13. #13 Re: New Cat Problems 
    The Blue One blueguy's Avatar
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    Cardinal Hill? I live in Liberty right by the High School. I got a guy if you need it inspected, let me know.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  14. #14 Re: New Cat Problems 
    GT Level Member Mitchstrp's Avatar
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    no i just passed lol. Do you know a guy named devin montague? im good friends with him.. I live about an hour south of you actually. St. Joke Missery (st joseph)
    1.8 RR's, Speed daddy headers, 180 stat, Open Cone, GBP tune, 3.5 pulley, and ported blower.
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  15. #15 Re: New Cat Problems 
    The Blue One blueguy's Avatar
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    Nope, don't know the guy...does he have a certain car or something that I should keep an eye out for?
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  16. #16 Re: New Cat Problems 
    GT Level Member Mitchstrp's Avatar
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    A certain car... Well has certain carsss... Hes dad collects late model mustangs and vettes and he himself I believe drives a porsche carrara (sp)
    1.8 RR's, Speed daddy headers, 180 stat, Open Cone, GBP tune, 3.5 pulley, and ported blower.
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