Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
11. With ISC plunger fully retracted, adjust carburetor base (slow idle stop screw to 470 RPM (minimum authority).
12. Place transmission in "PARK" (automatic transmissions).
13. Fully extend ISC plunger by applying 12 volts to terminal "D" and grounding lead to terminal "C" of the ISC motor connection. Leave power
applied only long enough to extend the plunger.
14. MANUAL TRANSMISSIONS: Using tool J29607 or BT-8022 or equivalent, turn ISC plunger to obtain 900 RPM (Maximum Authority).
15. AUTOMATIC TRANSMISSIONS:
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With transmission in "PARK", using tool J-29607, BT-8022 or equivalent, preset ISC plunger to obtain 1500 RPM.
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With parking brake set and drive wheels blocked, place transmission in "DRIVE". Turn ISC plunger to obtain 900 RPM (Maximum
Authority).
16. Recheck ISC "Maximum Authority" RPM with voltage applied to ISC motor (step 13). Motor will ratchet at full extension with power applied.
17. After adjustment of ISC plunger, measure distance from back side of plunger head to ISC nosepiece. Dimension "B" must not exceed that shown
in below chart.
