What is the egr on a 1997 Chevy Cavalier z24?

Answer 1

Basically the EGR (Exhaust Gas Recirculation) valve that lets exhaust fumes return to the combustion chamber to be re-burnt if the o2 sensor tells the computer their are to many gas fumes in this exhaust pipe not getting burnt. The computer then tells the fuel injectors not to stay open as long. These "Quad 4" engines were found to be way below the acceptable level. In mid-1999 model, the EGR was removed entirely. So if your car has one(EGR) 95-mid-99 It will have to remain plugged in just to keep the check engine light off.If you install a mid 99-newer engine, Just tuck it somewhere out of the way. Most of the time if you get a trouble code with the EGR it can be solved by removing it and cleaning exhaust funk out of the passage way. In 1999 they just changed the exhaust manifold gasket. It has one less hole in it.