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1995 Suzuki Sidekick EGR System Function and Testing. The EGR increases fuel efficiency by reducing pumping pressure. That is the work that the piston does to "suck" air in through a partially closed throttle valve. It allows exhaust gas in because it has very low oxygen so it will not effect the fuel/oxygen ratio. Remember that the EGR valve only opens when driving at a steady speed with partial throttle. It closes, does nothing, when idling or when accelerating or when throttle is wide open or when engine is cold.