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Home >> Hyundai >> 1987 >> Excel GL, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Feedback Carburetor System >> Operation >> Idle-Up Control
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Idle-Up Control

When tail switch or blower motor switch is on, engine idle speed is increased by changing throttle valve opening. To decrease hydrocarbons emitted during vehicle deceleration and to improve engine brake performance, ECU de-energizes solenoid valve which supplies manifold vacuum to throttle opener at or above preset engine speed. Throttle opener operation is suspended.