EGR System - BMW: Description

The BMW Exhaust Gas Recirculation (EGR) System routes a controlled amount of exhaust gases into intake manifold to reduce peak combustion temperatures and hence, NOx emissions. System consists of a vacuum controlled diaphragm valve assembly, a cyclone filter and various connecting hoses and pipes. In addition, six cylinder models also have an engine speed controlled spark advance system to further aid in the reduction of NOx emissions. This system consists of a double acting distributor vacuum unit, a two way magnetic valve connected to advance side of distributor unit, a speed sensing relay which controls two way valve, and various connecting hoses.