Auburn Auto Repair

Modern engines have a lot of parts you never see, and the EGR valve is one of the more misunderstood ones. Many drivers only hear about it when there is a check engine light, a rough idle, or an emissions failure. In reality, the EGR system does more than just satisfy regulations. When it works properly, it helps control combustion temperatures, protect the engine, and reduce pollution at the same time. What the EGR Valve Actually Does EGR stands for Exhaust Gas Recirculation. The valve’s job is to take a controlled amount of exhaust gas from the exhaust side and feed it back into the intake. That exhaust does not provide power, but it effectively takes up space in the cylinder so the fresh air and fuel mixture burns a little cooler. The engine computer opens and closes the EGR valve under certain conditions, such as cruising and light acceleration. It does not typically use EGR at idle, wide open throttle, or cold start. The whole idea is to reduce peak combu ... read more