1995 Suzuki Sidekick EGR System

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.