| So I noticed a Z I have is having little putt putt noises at idle. I assume these are misfires, really small ones. This thing is also failing smog for nox. After doing everything to fix the nox issue I'm at wits end. I'm beginning to correlate the misfire with the high nox after researching. Apparently the nox and carbon monoxide use each other for reduction, where the CO (carbon monoxide) gains an oxygen molecule from the nox molecule creating carbon dioxide and nitrogen. Well the CO is created from incomplete combustion in the engine, which happens on all engines. Anyhow, what I'm wondering is a few things: A misfire would probably create oxygen and hydrocarbons to pass by into the catalytic converter and then burn up there. I assume this would create carbon monoxide in the process? Well the readings I'm getting from the smog tests is absolutely zero CO percentage. So even if the misfire and high nox hypothesis is correct, how is there no CO being recorded after being produced by the catalytic converter?
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