What is the reason for the idle speed not dropping below 2000 RPM?
1 Answers
The reasons for the idle speed not dropping below 2000 RPM are as follows: Idle switch not closing: The rotation speed signal determines the fuel injection volume and injection timing, but the engine is operating under idle conditions with reduced air intake, leading to an overly rich air-fuel mixture and an increase in RPM. Faulty idle control valve: When the idle speed exceeds the set RPM, the ECU commands the idle control valve to reduce the air intake by closing the bypass channel, thereby lowering the engine speed. Issues such as sticking due to oil contamination, carbon buildup, or incomplete throttle closure can prevent the ECU from properly adjusting the idle speed, resulting in unstable idling.