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Home >> GMC >> 1989 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Adjustments >> Idle Speed >> Curb Idle
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Curb Idle

Set parking brake and block drive wheels. Warm engine to operating temperature. Install Tachometer (J-26925). Air cleaner must be in place and accessories turned off. Adjust low idle speed to specifications by turning low speed idle screw on pump. See IDLE SPEED (RPM) specifications table. See Figure.