Reduces Emissions: The primary function of the EGR valve is to reduce nitrogen oxide (NOx) emissions from the engine by recirculating a portion of the exhaust gas back into the intake manifold. NOx emissions are formed when nitrogen and oxygen in the air combine under high temperatures and pressures during combustion. The EGR valve helps lower combustion chamber temperatures, minimizing the formation of NOx.
Improves Fuel Efficiency: Recirculating exhaust gas into the intake also helps enhance fuel efficiency. The cooled exhaust gas displaces some of the fresh air-fuel mixture that would otherwise enter the cylinders, resulting in a leaner mixture. This leaner mixture allows the engine to operate more efficiently, leading to improved fuel economy.
Maintains Engine Performance: By reducing combustion temperatures and preventing excessive NOx emissions, the EGR valve contributes to overall engine performance and longevity. High combustion temperatures and excessive NOx can negatively impact engine components, potentially leading to reduced engine performance, engine knocking, and increased wear and tear.
In vehicles older than 20 years, such as the 1991 Wrangler, the original EGR valve may need regular inspection, cleaning, or replacement to ensure continued effectiveness. Proper maintenance of the EGR valve is essential for optimum engine performance and emissions compliance.
