LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1982 >> Magnavan Automatic Trans, Trans Mfr CD 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Gas RECIRCULATION >> Operation >> Back Pressure EGR System >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Back Pressure EGR System: Notes

Two types of back pressure type EGR valves are used by General Motors: a Positive Back Pressure EGR valve (used on Federal V8 models) and a Negative Back Pressure EGR valve (used on some 6-cylinder and most California V8 models).

Operation of the positive and negative back pressure systems is explained as follows:

scientia non olet · About LEMON Manuals