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The purpose is to re-burn any unburned hydrocarbons (fuel) remaining in the exhaust stream after the internal combustion process by putting some of the exhaust gases back through the intake process and scavage for any un-burnt fuel (gas). Hence the acronym EGR - Exhaust Gas Recirculation valve.

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13y ago
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Q: What is the purpose of egr valve in 2004 dodge 5.7?
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