Honda Workshop Service and Repair Manuals > Civic Wagon 2WD L4-1488cc 1.5L SOHC (EW1) 3V Carb (1986) > Engine, Cooling and Exhaust | Engine | Tune-up and Engine Performance Checks | Idle Speed | System Information | Adjustments | Idle Speed

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13. Adjust the speed, if necessary, by turning the adjusting screw on the idle boost diaphragm.

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