K 1500 1/2 Ton Pickup 4WD V8-350 5.7L VIN L 4-bbl (1982)
Idle Speed Control (Linkage): Adjustments
NOTE: If the valve cannot be adjusted, it must be replaced.
1. Disconnect valve to carburetor hose at carburetor and connect to an external vacuum source equipped with a vacuum gauge.
2. Disconnect valve to actuator hose at actuator and connect to vacuum gauge.
3. Firmly place finger over end of bleed fitting and apply minimum of 23 inches Hg vacuum to the control valve.
4. Seal off the vacuum source, then uncover the bleed fitting.
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The vacuum reading on the actuator side will drop off to zero and the reading on the vacuum source gauge will drop to a value designated as
the "valve set point".
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If this value is not 21.5 +/- 0.50 inches Hg, adjust valve as follows;
5. Pry off the plastic cover and turn the screw clockwise to raise the set point or counterclockwise to lower the set point and recheck setting.
