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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 5.0L V8 VIN [F] >> Hot (Slow) Idle Rpm >> Idle Speed Control Solenoid (ISS) - If Equipped

Idle Speed Control Solenoid (ISS) - If Equipped

  1. Prepare vehicle for adjustments according to directions on Emission Label on vehicle. Disconnect solenoid and turn air conditioning off. Set curb idle speed with idle speed screw.
  2. Connect solenoid. Disconnect A/C lead at compressor and turn A/C ON. Place transmission in "D".
  3. Open throttle to extend solenoid plunger. Turn solenoid screw to adjust RPM. Reconnect A/C lead.
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