Other Exhaust Emissions

There are a few other exhaust components which impact driveability and/or emissions diagnosis, that are not measured by shop analyzers. They are:

• Particulate carbon soot (C)

Sulfur dioxide (SO2) is sometimes created during the combustion process from the small amount of sulfur present in gasoline. During certain conditions the catalyst oxidizes sulfur dioxide to make SO3, which then reacts with water to make H2SO4 or sulfuric acid. Finally, when sulfur and hydrogen react, it forms hydrogen sulfide gas. This process creates the rotten egg odor you sometimes smell when following vehicles on the highway. Particulate carbon soot is the visible black "smoke you see from the tailpipe of a vehicle that's running very rich.

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