What is the reason for the high idle speed during cold start of Nissan Sylphy?
1 Answers
Nissan Sylphy's high idle speed during cold start is due to relatively low temperatures. Brief introduction to the reasons for high idle speed during cold start: When the car is started cold or at relatively low temperatures, it may experience engine shaking, high idle speed, transmission hesitation, and brake noise. Additionally, there may be a strong odor of unburned gasoline and black smoke. The steering gear also bears a significant load, especially if the air conditioning is turned on immediately, which can cause the compressor to be very noisy. It is advisable not to shift gears and drive immediately, as this can increase the burden on related core components. This is because, during a cold start, the engine oil, transmission fluid, brake fluid, and other fluids are not yet warmed up, and the water temperature has not risen. Solutions for high idle speed during cold start: High idle speed during cold start is a normal phenomenon. After starting in a cold state, the engine needs to quickly enter its normal working environment. Therefore, during a cold start, the engine's computer automatically injects more fuel to rapidly increase the engine's water temperature by burning more fuel than during normal idle operation. This helps the engine quickly reach a suitable temperature, with the speed generally ranging between 950 to 1300 RPM. Once the engine temperature rises to a certain level, the idle speed will drop to the normal value. A cold start refers to starting the engine when the water temperature is low, usually after the car has not been used for a long time, such as after overnight parking.
