18I/Sportwagon L4-1647cc 100 CID (1982)
Fig.15 - Vacuum Solenoid Regulator
When the oxygen sensor registers a rich mixture, it sends a stronger voltage signal to the control unit. A signal from the control unit causes the
solenoid core to remain in top (55) position for a greater percentage of time than it remains in the lower (SI), Fig. 15, position. Vacuum to the
carburetor actuators increases, causing leaner air/fuel mixtures. When the oxygen sensor registers a lean mixture, it sends a weaker signal to the
control unit. The signal from the control unit then causes the solenoid core to spend a greater percentage of time in the lower (SI) position,
decreasing vacuum to the carburetor actuators, causing leaner air/fuel mixtures.
