Feedback Carburetor System: Description

The feedback carburetor system maintains proper air/fuel ratio during engine operation. Air control valves are used to bypass additional air into the intake manifold to adjust temporary rich mixture condition. The system consists of 2 feedback systems, "X" and "M".

The "X" system consists of an air control valve B, air chamber (Accord), feedback control solenoid valve (Accord and Prelude), frequency solenoid B, constant vacuum valve (Prelude), constant vacuum generator (Accord), check valves A, B, C and E, surge tanks A and B, vacuum switch A (Accord) and the control unit. Surge tank A is used as a reservoir. Surge tank B is used to dampen vacuum pulses to air control valve B.

The "M" system consists of check valve A (Civic 1500 and Prelude), air control valve A, frequency solenoid valve A and the control unit.