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Home >> Honda >> 1973 >> Civic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emission Systems >> Adjustments >> Idle Speed & Mixture >> Idle Drop Method

Idle Drop Method

  1. Adjust idle speed with headlights ON to 800 ± 50 RPM (Man. Trans.) or 750 ± 50 RPM (Auto. Trans, in gear).
  2. Remove limiter cap and turn idle mixture screw counterclockwise until engine speed drops. Now turn screw clockwise until engine reaches highest RPM.
    NOTE: If idle speed is now above specification, repeat steps  1) &  2).
  3. Continue to turn mixture screw clockwise until idle speed drops 40 RPM (Man. Trans.) or 20 RPM (Auto. Trans.). Replace limiter cap.
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