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Thread: Exhaust Header Leaks

  1. #1

    Default Exhaust Header Leaks

    Could I have damaged the WBO2 sensor on first startup if I had leaks in the header manifold & collector gaskets? I tightened up all bolts. On second startup AFR stayed around 12.5 until operating temp, then started to fluctuate until it stalled. Could have I ruined the sensor?

  2. #2


    Exhaust leaks will not damage your WBO2 sensor. It will just give you a false AFR reading because not all of the exhaust gasses are passing by the sensor. I'm assuming this is the first time you started it up, so the Sniper needs time to self-tune. I would be happy to help dial in your tune if you want to upload your current GCF and a datalog of it idling, and if you can, of it driving.

  3. #3


    After checking some loose bolts, I restarted & idled much better, but after coming up to temp idle started to drop. AFR showed 12.6 on startup then before it stalled, AFR shot up to 22.6.

  4. #4


    I can help you if you give me a datalog and your current GCF. Other than that, just restart your Wizard. It sounds like your Learn Table is corrupted from the first exhaust leak.

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