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Originally Posted by Wikipedia
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.
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Mystery solved! Thanks for that info.
Going to listen closely next time and see if i can hear the turbo vacuum control valve too.