Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Mixture Control Solenoid: Adjustments
1. Remove air horn, mixture control solenoid plunger, air horn gasket and plastic filler block, using normal service procedures.
2. Remove throttle side metering rod. Install mixture control solenoid gaging Tool JD-33815-1, BT-8253-A, or equivalent, over the throttle side
metering jet rod guide, and temporarily reinstall the solenoid plunger into the solenoid body.
Installing Mixture Control Solenoid Gauging Tool
Adjusting Lean Mixture Solenoid Screw
3. Holding the solenoid plunger in the DOWN position, use Tool JD-28696-10, BT-7928, or equivalent, to turn lean mixture (solenoid) screw
counterclockwise until the plunger breaks contact with the gaging tool. The adjustment is correct when the solenoid plunger is contacting BOTH
the SOLENOID STOP and the GAGING TOOL. If the total difference in adjustment required less than 3/4 turn of the lean mixture (solenoid)
screw, the original setting was within the manufacture's specifications.
4. Remove solenoid plunger and gaging tool, reinstall metering rod and plastic filler block.
5. Invert air horn and remove rich mixture stop screw and rich authority adjusting spring from bottom side of air horn, using Tool JD-28696-4,
BT-7967A or equivalent.
