On Federal 1987 V6-173 engines, the Electronic Control Module (ECM) will energize the electric air control valve whenever the engine is started, directing air flow to the exhaust ports. When the engine is operating in the closed loop mode, air flow should be to the air cleaner, with no air flow to the exhaust ports. During engine deceleration, a rise in the manifold vacuum signal to the electric air control valve, will cause the valve to direct the air to the air cleaner. Also at higher engine speeds, air is directed to the air cleaner through the pressure relief valve even though the solenoid may be energized. At higher engine coolant temperatures, the electric air control valve solenoid is de-energized, directing air to the air cleaner. On all engines except 1987 Federal V6-173 engines, at cold engine coolant temperatures or at wide open throttle conditions, the Electronic Control Module (ECM) will energize the electric air control valve solenoid, directing the air to the exhaust manifold ports. The electric air control valve directs air to either the exhaust manifold ports or the air cleaner, which also acts as silencer. On 1987 V6-262 and V8 engines, an electric air control valve with relief tube (ECT) is used, Fig. The vane type air pump supplies air through a centrifugal filter fan to the electric air control (EAC) valve, Fig. This system consist of a belt driven air pump, internal drilled passages in the cylinder head or manifolds, piping and hoses, electric air control valve and check valves. This continued combustion aids in reducing HC and CO levels in the exhaust and also helps in maintaining ideal catalytic converter operating temperatures. The Air Management System provides filtered air, under certain conditions, to the exhaust manifold to continue the combustion process after the exhaust gases have left the combustion chamber. It works differently by year and application but here's a generic description of an electronically controlled system with carb
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