Carburetor engine management system Honda Accord 3

General information about the carburetor system
On these engines, the engine management system is considered part of the emission control system. The major components include the carburetors, feedback control system, air intake system, throttle control system and EGR...

Air filter with thermostat
This is a temperature controlled device that improves hot engine performance and reduces carburetor icing. The air cleaner assembly is equipped with a vacuum controlled air flow control diaphragm at the inlet and a...

Feedback control system
The system performs 4 functions: air-fuel mixture control, air exhaust control, air intake retardation and hot engine start control. Its components include an exhaust gas oxygen sensor, EACV and an on-board computer....

Engine Air Control Valve (EACV)
Checking functionality 1. Start the engine and allow it to warm up to operating temperature. Disconnect the EACV hose from the air cleaner and, with the engine speed reaching approximately 3500 rpm, feel for vacuum in...

Air injection system
This device is designed to provide oxygen to the exhaust stream. Oxygen is supplied at a point in the exhaust pipe where the temperature is high enough to effectively burn off some hydrocarbon compounds. The main...

Throttle control system
This system is designed to prevent the formation of an over-rich fuel-air mixture when the throttle valve is closed at high engine speeds, such as when changing gears or braking. At idle, a high vacuum from the exhaust...

Idle speed increase regulator
When the air conditioning clutch is engaged, a solenoid valve is activated, which supplies exhaust manifold vacuum to the idle speed increase control. This device opens the throttle valve just enough to maintain the set...

Air leak solenoid valve
During normal engine operation, a small amount of air is bleed into the primary jets of the carburetors to regulate the mixture and improve fuel atomization. During cranking or full throttle operation, the bleed valve...

Primary idle mixture cut-off solenoid valve
The purpose of this valve, installed in each of the carburetors, is to shut off the fuel supply to the idle circuit. They are open when the ignition is on and closed when decelerating or when the ignition is off. The...

Vacuum piston control system
The variability of the Venturi tube size is achieved by moving a piston up and down inside the tube. The piston is driven by vacuum supplied from the storage chamber, which maintains sufficient vacuum even with the...

Economizer valve
There is a valve at the bottom of the carburetor, the opening of which supplies additional fuel to the main jet channel. The valve is actuated by vacuum supplied through a two-way electromagnetic valve, which, in turn,...

Air flow regulator
This device supplies a controlled amount of air to the idle and main jets of each carburetor. The device has membranes that are sensitive to changes in air pressure associated with changes in altitude above sea level....

Automatic air damper
The flap is controlled by a vacuum-actuated valve that is adjusted based on coolant temperature. A separate temperature-sensitive valve controls the flow of coolant through the carburetor heating channels. As the...

Error codes
All carbureted Accord models from 1984 onwards and Prelude models from 1984-1987 have control controllers with some feedback. For example, a mini-computer that controls the electromagnetic valves of the air ducts taking...

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