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.
The EGR valve recirculates gases from the engine to burn again, reducing emissions. However, as your mechanic, Iâd have to ask a few more questions and do a few tests to help diagnose the issue. An idle surge can be caused by multiple phenomena. Let pros handle your air conditioning If an engine is not getting enough fuel (this is called ârunning leanâ), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.