S15/T15 Jimmy 2WD L4-119 1.9L VIN A 2-BBL (1983)
Thermal Vacuum Valve - Carb: Description and Operation
Closed Loop Fuel Control System
The vacuum control valve converts electrical signals from ECM into vacuum signals through the vacuum control solenoid. These vacuum signals
trigger the fuel control actuators in the carburetor which control the air/fuel ratio.
This valve consists of a vacuum regulator which regulates fluctuating vacuum from intake manifold to a constant specified vacuum, and a vacuum
control solenoid which controls vacuum level from vacuum regulator by signals from ECM.
