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Home >> Oldsmobile >> 1983 >> Omega Base, 2D Coupe, 2.5 R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> EGR System - Gasoline >> Operation >> Exhaust Back-Pressure Modulated EGR System >> Notes
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Exhaust Back-Pressure Modulated EGR System: Notes

Two types of back-pressure EGR valves are used, either a positive or negative back-pressure valve. Operation of these 2 systems is as follows:

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