Swift L4-1298cc 1.3L DOHC 3 MFI 16V (1989)
Deceleration Valve: Description and Operation
Deceleration Mixture Control System
This system is designed to allow fresh air into the intake manifold to reduce excessive HC and CO emission caused by temporary rich air/fuel ratio
during rapid deceleration. This system consists of an MCV, jet and vacuum hoses. The MCV consists of a pressure balancing orifice and a check valve
on its diaphragm, and closes when manifold vacuum is constant. When manifold vacuum becomes constant, pressure difference between chambers A
and B, gradually diminishes through the pressure balancing orifice, then the MCV.