For more information on what does an EGR valve do, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. On-board diagnostics and an illuminated MIL will indicate when an electronic valve needs to be replaced.Ĭheck out all the fuel & emission system parts available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. On a mechanical valve a visual inspection of the plunger and plunger shaft during idle can determine whether the valve is stuck open or closed.

How to determine if the EGR valve is malfunctioning? Both conditions will lead to significant drivability problems. If stuck in the closed position, the nitrogen oxides will rise and the fuel mixture will ignite before reaching the “explosion” section in the cylinder. If the EGR valve becomes stuck in the open position, it eventually will cause a vacuum leak. What are the common causes of failure?Įxposure to water and heat from the engine compartment typically leads to EGR valve failure. 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. The exhaust gas displaces atmospheric air and reduces O2 in the. 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. EGR works by recirculating a portion of an engines exhaust gas back to the engine cylinders. 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).

What does a egv valve do