Thread: Catalyst Under Threshold

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  1. #1 Catalyst Under Threshold 
    SE Level Member Pontiac Warrior's Avatar
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    I am having an issue with a code being triggered in my car and it causing the check engine light to come on. I know my catalytic converter isd good since it is a brand new Magnaflow high flow preformance cat from zzp. The guys at Advanced auto are telling me i may have an exhaust leak? Anyone experinced this and know for sure? Or am I having a problem because of the high flow cat? Any Help would be appreciated thanks guys!!!!
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  2. #2 Re: Catalyst Under Threshold 
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    Check for an exhaust leak, you'll be able to hear it.

    If there isn't one.

    Then its just the cat being a whore.

    They tend to do that if your tune is off.
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  3. #3 Re: Catalyst Under Threshold 
    SE Level Member Pontiac Warrior's Avatar
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    I listened for a leak and yea there is one. If the leak being fixed doesnt help Would a tune up help the problem?
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  4. #4 Re: Catalyst Under Threshold 
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    a street tune with a wideband would fix it.

    Depending on what year your car is, you could run an O2 sim.

    Unsure if you have emissions and if this would effect that.
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  5. #5 Re: Catalyst Under Threshold 
    The Blue One blueguy's Avatar
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    Who has emissions? Delete that EGR and Converter crap and never worry about it again.
    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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