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Thread: Are my O2 sensors good now?

  1. #1
    Potential Tuner
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    Apr 2021
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    Question Are my O2 sensors good now?

    2014 Corvette C7 Z51 with new injectors (AUS Injection), new spark plugs (original GM), new oil, new MAF (original GM). Air filter is not attached tho

    What do you think of those readings after I changed upstream O2 on both banks and the MAF?

    Still having misfrires on cyl5 and rough idle and mid range. Narrowing it I can exclude O2 and cats from the equation right?

    See attached full scan file for more details

    swappy-20250708_164014.png
    swappy-20250708_164031.png
    swappy-20250708_164040.png

  2. #2
    Tuning Addict edcmat-l1's Avatar
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    The O2s look pretty smooth. Hard to tell if there's a real misfire you don't have it under any load in that data log.

    If it has an aftermarket cam looking at the misfire counter is a waste of time.

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  3. #3
    Potential Tuner
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    Apr 2021
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    It's probably the stock cam. Can't have it under load as the car is not registered at the moment

    I'll swap coil #5 and test the cats next weekend