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Did you happen to find any information about what happens to the HC and CO readings if the mixture is too lean? I'm wondering if lean misfires cause high HC readings, like an ignition-caused misfire would cause high HC readings. I find this all very interesting.
I had a truck that had high HC readings because three exhaust valves were leaking. I'm guessing the air/fuel mixture was leaking past the exhaust valves before ignition.
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