Main BYD f3 idle speed is high. What is the reason?

There are many reasons for high idle speed, as follows:

Idle speed increases during cold start. Why is the idle speed high during cold start? In fact, this is normal, mainly because some all-aluminum engines dissipate heat too quickly, have good sealing performance, and have high efficiency in restarting exhaust combustion. Therefore, if the ignition speed is low, there will be insufficient combustion, resulting in excessive carbon deposition or lack of cylinder, so high speed is actually the protection of the engine during ignition.

Turn on the air conditioner, and the idle speed may increase. After turning on the air conditioner, the engine needs extra power to drive the compressor, that is, the load increases, and it needs to increase fuel injection to supplement this power, and the idle speed will increase accordingly. These are controlled by ECU. The larger the air conditioning gear, the lower the temperature, the greater the engine load, and the low idle speed is easy to stall.

These conditions may cause the idle speed to be too high:

1, idling for a long time. When the car stops at idle speed, the throttle opening is almost zero and the air intake is very small. The injected fuel vapor diffuses in the opposite direction and adheres to the throttle valve. Coupled with the promotion of impurities and moisture in the air, carbon deposits are formed over time.

2. Using inferior air filter and not being diligent in maintenance will directly affect the air quality entering the engine.

3. The idle time is long, and the time for the engine to reach normal temperature is also long.

4. Always drive at high speed and low speed.

References:

Baidu encyclopedia-idle speed