Emissions Gas Analysis Calculator

Interpret exhaust emissions gas readings (HC, CO, CO2, O2, NOx) to diagnose engine combustion efficiency and mixture quality.

Input Parameters

Results

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Combustion Efficiency
%
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Lambda Value
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Mixture Status
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Diagnosis
Note: Five-gas analysis reveals combustion quality. High HC+CO=rich, high HC+low CO=misfire, high NOx=lean/hot combustion. Ideal CO2 is 14.7% at stoich.

Reference

Combustion Efficiency = CO2 / (CO2 + CO) x 100 Lambda = 1 + (O2 - 0.5xCO)/2 / (CO2 + CO) Lambda < 0.97 = Rich, > 1.03 = Lean Ideal: CO2 > 14%, CO < 0.5%, HC < 100 ppm High NOx indicates excessive combustion temps