The name Minneapolis is attributed to Charles Hoag, the city's first schoolteacher, who combined mni, a Dakota Sioux word for water, and polis, the Greek word for city.
EGR valve on top of the inlet manifold of a Saab H engine in a 1987 Saab 90. In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders.
Bad EGR Valve Symptoms. If you suspect an exhaust gas recirculation (EGR) valve failure, one way of confirming it is to look for some indirect symptoms. In this Buzzle article, we have listed some of the prime symptoms of a bad EGR valve that you should be watching out for.