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EGR Valves

The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust emissions back into the intake manifold. These gases mix with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust gas your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing NCT emissions testing.  

Unfortunately, your EGR valve can get stuck, causing NOX gases to build up.

meat & doria egr valve longfordIf the EGR valve is stuck open, it will essentially cause a vacuum leak, leading to inefficient combustion, rough idling, hesitation, and sometimes stalling in extreme cases. This is because the car cannot combust on carbon dioxide from the tailpipe — it needs atmospheric oxygen. If the combustion chamber is flooded with exhaust gases from an open EGR valve, it will not function properly.

pierburg egr valve longfordIf the EGR valve is stuck closed, emissions of nitrogen oxides will rise, and the car may start to knock. Spark knock happens when the fuel mixture in the combustion chamber ignites before it has been reached by the explosion in the cylinder, resulting in a disruption of the engine timing. In this instance, the engine should be warmed up and revved to see if the EGR valve will move.

The EGR valve can be an expensive motor vehicle component. Failure to repair or replace the EGR valve will not lead to a life threatening condition, although it will reduce the life of your car and increase exhaust emissions. If your car has been diagnosed with such a problem, contact us. We have an extensive range of EGR valves in stock, as well as over 100 alternative part numbers readily available to order. Brands include Pierburg, Bosch, Denso, Hella and Meat & Doria.

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BM Motor Factors, Unit 1D Mastertech Business Park, Athlone Road, Longford, Ireland
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