Another device called the EGR Valve in Toyota Sequoia maintains the circulation of back the exhaust gases to intake/combustion chamber in situations when the air fuel mixture concentration is distorted, thus diminishing air borne pollutants. This technique assists in reducing the nitrogen oxide emissions because it retains certain amounts of exhaust gases causing the lower combustion temperature and therefore increasing the engine power. Since its early days when EGR was simply introduced alongside jets, the development has produced engine valves that are the commanded by the conditions in the engine and present day EGR optimizes the flow according to the load. While EGR has proven to be efficient for the meeting of emission requirements, there exist newer engines that do not call for EGR. This is why maintenance is required from time to time in order to clean the EGR valve from carbon deposits.
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