740 L4-2320cc 2.3L DOHC B234F (Can) (1992)
The distributor then distributes this voltage to the spark plugs via the ignition leads.
Exhaust Gas Recirculation (EGR) system
In certain markets cars are equipped with an EGR system which reduces emissions of nitrogen oxides (NOx) in the exhaust gases. The EGR system
recycles some of the exhaust gases into the combustion chamber at high engine loads. This reduces combustion temperature, resulting in a reduction in
NOx.
The EGR valve
The EGR valve controls the flow of gases from the exhaust manifold to the Intake manifold. This valve is controlled by a vacuum in the vacuum
hose from the vacuum regulator.
The EGR vacuum controller
The EGR vacuum controller controls the vacuum to the EGR valve from the output at the base of the controller (yellow hose). The vacuum from
the intake manifold is fed into the upper section of the vacuum controller (white hose). The EGR vacuum controller stabilizes the vacuum in the
Intake manifold and converts the electrical signal from the control module into a modulated vacuum signal to control the EGR valve.