Quote:
Originally Posted by Basstrip
by the way what is the job of the EGR.
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The function of the EGR (Exhaust Gas Recirculation) system is to reduce the emissions of oxides of nitrogen (NOx). NOx is a strong lung irritant, a major constituent of "smog," and a contributor to acid rain. NOx is formed during combustion when temperatures and pressures are high enough to cause a chemical reaction between the oxygen and nitrogen that are present in the combustion air. EGR reduces combustion temperature and pressure by replacing some of the oxygen-rich air with a more inert gas: exhaust gas. This slows and cools the combustion process, thus reducing NOx formation. EGR reduces engine efficiency slightly and if there is too much EGR it can affect driveability, especially in gasoline engines. Many people disconnect their EGR systems. I choose to leave mine operational because I like to minimize my personal contribution to the damage of the environment within practical limits.