Description & Operation: Notes

The throttle system is used to reduce hydrocarbon (HC) emissions during gear shifting and deceleration. The throttle opener diaphragm holds the throttle open slightly as necessary to improve combustion. System consists of a throttle control valve, a speed sensor, a throttle opener solenoid valve, a throttle opener diaphragm, a dashpot check valve (mounted inside throttle control valve), and hoses and wires connecting the various components. The Federal Civic Hatchback with a 1500 engine and manual transmission is also equipped with a engine RPM sensor, a thermosensor, and a second throttle opener solenoid valve.