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Home >> Chevrolet >> 1984 >> Impala 5.7 N, 200-4R/MW9 >> 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. These valves may be identified by the letter in the last position of the part number. A "P" designates a positive back-pressure valve and "N" a negative back-pressure valve. Operation of these 2 systems is as follows:

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