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it is a emission device exhaust gas recirculation , it take exhaust gasses and by control of the cars pcm or computer and a egr valve it introduces a calibrated amount of exhaust back into the engines air fuel mixture.exhaust being mostly a inert gas will lower combustion chamber temperatures for a more efficient burn that will lower nitrous oxide emissions. its also re-burns left over hydro carbons that do not get burned in the combustion process

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8y ago
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15y ago

EGR (exhaust gas reclaimer), it is designed to reburn unburned exhaust gases. It helps clean up emissions.

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16y ago

Exhaust gas recirculation (EGR) is a NOx (nitrogen oxide and nitrogen dioxide) reduction technique used in most gasoline and diesel engines.

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Q: What is an EGR valve what does it do?
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