The present invention relates to an idle exhaust gas control method for an ELP engine, wherein an idle adjustment screw mounted on a bypass line for regulating the pressure output from the LPB regulates the amount of gas flowing into the engine, The feedback duty ratio is set to 50% according to the oxygen concentration obtained from the oxygen sensor. By monitoring the feed back duty ratio, the user adjusts the idle adjusting screw to adjust the feed back duty ratio of the engine control device by 40% to 60% As shown in FIG.;The user monitors the feed back solenoid control duty ratio according to the oxygen concentration output from the engine control unit and adjusts the idle adjusting screw so that carbon dioxide reaches the proper amount, thereby efficiently adjusting the amount of carbon dioxide in the idle state of the new car. A method for controlling an idle exhaust gas of an ELF engine is provided.
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