Karl Here’s My .5cent > General Rules of Emission Analysis • If CO goes up, O2 goes down, and conversely if O2 goes up, CO goes down. Remember, CO readings are an indicator of a rich running engine and O2 readings are an indicator of a lean running engine. • If HC increases as a result of a lean misfire, O2 will also increase • CO2 will decrease in any of the above cases because of an air/fuel imbalance or misfire • An increase in CO does not necessarily mean there will be an increase in HC. Additional HC will only be created at the point where rich misfire begins (3% to 4% CO) • High HC, low CO, and high O2 at same time indicates a misfire due to lean or EGR diluted mixture • High HC, high CO, and high O2 at same time indicates a misfire due to excessively rich mixture. • High HC, Normal to marginally low CO, high O2, indicates a misfire due to a mechanical engine problem or ignition misfire • Normal to marginally high HC, Normal to marginally low CO, and high O2 indicates a misfire due to false air or marginally lean mixture
From here http://www.crypton.co.za/Tto%20know/Emissions/exhaust%20emissions.html
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