Shop 1991 Buick Century Exhaust Gas Recirculation (EGR) Valve. 7.4 liter, all. All Models; 7.4L. Express Emission, Combustion - OEM Buick Part # 12578038 (17113535)

Exhaust Gas Recirculation (EGR) Valve.
A Valve used to recirculate small amounts of Exhaust back into the combustion chambers of the engine in order to decrease the combustion temperature, thereby reducing the formation of smog-producing nitrogen oxides.

EGR Valve

7.4 liter, all. All Models; 7.4L. Express, Savana; 7.4L. W/7.4 LITER, GAS. W/O DIESEL.
EGR Valve - Repair or Replace
A failed EGR valve will often have no noticeable symptoms beyond a check engine light, but it does cause your to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and genuine parts.