![]() Failure to replace the EGR valve when needed may shorten engine life and increase harmful emissions. Symptoms of a faulty EGR valve are rough idle, hesitation, knocking and in some cases stalling. Yes, a failing EGR valve can cause a check engine light to come on, especially on the Ford DFPE (Differential Pressure Feedback EGR) and those vehicles with electronic valves. Will a malfunctioning EGR valve illuminate the check engine light or affect vehicle operation? ![]() The EGR valve is located on the intake manifold of an engine. The EGR valve also reduces the engine’s octane requirements and lessens the danger of detonation (spark knock). The EGR valve draws exhaust by means of intake vacuum which dilutes the incoming air/fuel mixture reducing the temperature in the chambers bringing the NOx within acceptable limits. The EGR (Exhaust Gas Recirculation) valve is an emission control device which helps maintain the combustion chamber temperature in an effort to reduce the formation of nitrogen oxides (NOx).
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