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So, The (EGR) valve is an emission control device which helps maintain the combustion chamber temperature. Consequently, In an effort to reduce the formation of nitrogen oxides (NOx). Also, The Exhaust Gas Recirculation valve draws exhaust by means of intake vacuum which dilutes the incoming air/fuel mixture. As a result, Reducing the temperature in the chambers bringing the NOx within acceptable limits. Finally, The Exhaust Gas Recirculation valve also reduces the engine’s octane requirements, and lessens the danger of detonation (spark knock).
The most common problem with an Exhaust Gas Recirculation valve; is when carbon build up on the valve cause it to stick. In worst cases, an Exhaust Gas Recirculation valve and the Exhaust Gas Recirculation passages can be completely clogged up. Symptoms of an Exhaust Gas Recirculation valve that is stuck open include rough unstable idle and stalling.
Often a car stalls when stopping after exiting the highway. If the Exhaust Gas Recirculation system is clogged up, or the valve is stuck closed, the combustion temperature increases. This may cause pinging (detonation), as well as surging on light acceleration. In a diesel engine, a bad Exhaust Gas Recirculation valve is one of the causes of a black smoke. The Check Engine light might also come on in either case.
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