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Chevy Truck
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1999
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K 1500 Truck 4WD V8-5.7L VIN R
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Repair and Diagnosis
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Powertrain Management
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Emission Control Systems
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Exhaust Gas Recirculation
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Description and Operation
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Purpose
Purpose
The
Exhaust Gas Recirculation
(EGR)
system lowers the NOx (Oxides of Nitrogen) emission levels created by the high combustion temperatures.