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Old 04-18-2003, 08:29 PM
Mike Richards Mike Richards is offline
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Join Date: Dec 2001
Posts: 577
Some theoretical stuff to add. What follows is taken directly from "Bosch Fuel Injection & Engine Management" by Charles Probst.

Rich mixtures increase fuel consumption and emissions of hydrocarbons(HC) and carbon monoxide(CO) - the products of incompletely burned gasoline.

Lean mixtures reduce power, elevate engine temperature, and increase emissions of oxides of nitrogen(NOx) - a product of combustion at excessively high temperature. They also tend to cause driveability problems.
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