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.
intake hose image by Five Arrows from Fotolia.com. When a car backfires, it means that something has stopped working properly in the emission system in the engine. There are a number of things that can cause the improper fuel/air mixture which leaves unburned fuel in the exhaust manifold that may ignite. The sudden explosion of the fuel that was sitting is the cause of the loud sound that is generally referred to as backfiring.