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GM EGR Valve

GM EGR valve refers to the component of the General Motors automobile exhaust system that regulates the re-circulation of exhaust gases to the combustion chambers. The acronym, EGR, stands for exhaust gas re-circulation. As the name suggests, the GM EGR valve controls the flow of exhaust gases that returns to the combustion chambers. Generally, EGR is a technique used in most gasoline and diesel engines to eliminate or at least reduce the concentration of nitrogen oxide and nitrogen dioxide in the exhaust gases. Nitrogen oxides are pollutants that can be formed if there is excess air present during combustion. Nitrogen oxides are greenhouse gases that contribute to global warming. They can also be converted into nitric acids when combined with water, thereby causing acid rain.

When the fuel/air mixture is said to be lean, there is proportionally greater amount of air in the mixture. Since air is 78% nitrogen, the elemental or free nitrogen in air will tend to combine with the excess free oxygen under great pressure and temperature inside the combustion chambers. Since there is lesser amount of fuel to burn, there would be excess oxygen available to chemically react with the elemental nitrogen in the air. Consequently, nitrogen oxides are formed.

By allowing certain amount of exhaust gases to re-circulate back to the combustion chambers, the nitrogen oxides are broken down into elemental oxygen and nitrogen. The oxygen can be further used by the engine to completely combust the fuel. GM EGR valves regulate the flow of exhaust gases so that the right proportion of fuel and air can still be maintained without reducing the mechanical output of the engine.

GM EGR Valve - GM EGR Valves


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