Tuesday, May 13, 2014
What Does an EGR Valve Do in a Mercury Sable
The exhaust gas recirculation valve, or EGR valve, is part of the Mercury Sables emissions control systems. EGR valves, which were introduced in the 1970s, are now included on all automobiles in the United States.
Purpose
The EGR valve, usually located on the intake manifold, reduces oxides of nitrogen (NOx) that form in internal combustion engines when temperatures reach 2,500 degrees Fahrenheit or more. Nitrogen and oxygen combine to form NOx, a component of smog.
Function
As its name implies, the EGR valve recirculates exhaust gases back into the combustion chamber. Because the exhaust gases cannot be burned again, the result is cooler temperatures in the combustion chambers---several hundred degrees cooler. This reduces the production of NOx.
Performance
The creation of the EGR valve has enabled auto engineers to design more aggressive timing for engines, increasing efficiency and, as a result, improving fuel economy. A malfunctioning EGR valve, however, leads to engine ping and knocking.
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