Air Fuel Mixture Impact on Exhaust Emissions

As you can see in the graph above, HC and CO levels are relatively low near the theoretically ideal 14.7 to 1 air/fuel ratio. This reinforces the need to maintain strict air/fuel mixture control. However, NOx production is very high just slightly leaner than this ideal mixture range. This inverse relationship between hC/CO production and NOx production poses a problem when controlling total emission output. Because of this relationship, you can understand the complexity in reducing all three emissions at the same time.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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