Quote:
Originally posted by SVXMAN2001
what is the EGR valve and its purpose?
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blatantly stolen from the web (Google is your friend).
"The exhaust gas recirculation (EGR) system is used to reduce the amount of NOx created by the engine. It does this by diluting the air/fuel mixture with a small amount of inert gas (usually less than 10% of the total mixture); exhaust gas is used since it contains only a small amount of oxygen (and is readily available). Adding it has the effect of lowering the combustion temperature below the point at which nitrogen combines with oxygen to form NOx. When working properly, the EGR does not open when the engine is cold, at idle or WOT. A defective EGR can have a severe impact on the quality of idle."