S10/T10 P/U,Blazer L4-119 1.9L (1982)
Intake Manifold Vacuum Damper: Description and Operation
The vacuum controller consists of a vacuum regulator which regulates 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.
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The ECM controls the air/fuel ratio by varying the Duty Cycle of the vacuum controller solenoid as a function of sensor input voltages.
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The vacuum controller controls the vacuum signals to the fuel control actuators in the carburetor by actuating the vacuum control solenoid.
