There is no high idle speed when the cold car starts. What's wrong?

Too dirty throttle will lead to throttle opening error, throttle sensitivity will be reduced, and it may not be closed well at idle speed, resulting in abnormal idle speed. In addition, the throttle failure will also affect the engine's power, acceleration performance and fuel consumption, and even lead to difficulties in starting in serious cases.

Because the engine needs to enter the normal working environment as soon as possible after the car is started in a cold state, when the car is started, the engine computer will automatically inject more fuel, and by burning more fuel than the normal idle speed, the water temperature of the engine will rise rapidly, so that the engine can quickly enter the appropriate temperature. The main performance is that when the car is cold, the idle speed of the engine will be relatively high, generally at 950- 1300 rpm. When the engine temperature rises to a certain value, the idle speed will drop to the normal value.

Extended data:

Precautions for automobile starting:

1. In winter, users should not rush to start the car. They should go from front left to back left, then to the right and back to the left front door. Then they have to make a surface inspection of the whole vehicle and get ready to go. When starting, they must step on the clutch pedal to separate the gearbox from the engine and reduce the engine load.

2. Before starting the car, turn on the ignition switch, wait for about 5 seconds, and let the oil pump work before starting.

3, pay attention to open the door a little, so as to avoid the fog make the front block can't see the road clearly, don't turn on the hot air heater before the temperature comes up, so as not to make the engine warm up for too long.

After starting the engine, it is best to turn on the lights, radios and other electrical equipment. Before parking, turn off these power-consuming electrical facilities and then turn off the engine.

5. Before the car starts, check whether all kinds of light signals are effective and whether the brakes are effective. Start from the lowest gear and gradually accelerate, so that the car has an adaptation process.

Baidu encyclopedia-car cold start