Traditional Culture Encyclopedia - The 24 Solar Terms - The idle speed of the hot car is unstable, rising and falling.
The idle speed of the hot car is unstable, rising and falling.
The reasons for the unstable idle speed of automobile are: the idle air hole is blocked, the idle device is not working well, the spark of the spark plug of individual cylinders is too weak, the seal of individual valves is not tight, the intake manifold leaks air, the ignition time is too early or too late, and the idle speed is not adjusted properly.
Then the most direct way to deal with the unstable idle speed of the car is to adjust the idle speed, and make the engine run at the lowest stable speed by adjusting the throttle opening adjusting screw. Because it is necessary to carry out a series of inspections on the car before adjusting the idle speed, such as engine temperature, valve clearance, ignition system, pipeline sealing, throttle opening, throttle sealing and so on. It is not recommended for the owner to operate. It is best to go to a professional repair shop or 4S shop for adjustment.
As I said just now, the idle speed should be adjusted when other parts of the vehicle are in good condition, such as the intake manifold. If the intake manifold leaks air, it will also lead to an increase in engine speed and unstable idle speed. The follow is that method for the owner to identify whet the intake manifold leaks air:
1. Open the engine compartment cover and remove the air filter of the throttle valve.
2. Start the car and block the throttle with your hand (after blocking, the car stalls, indicating that there is no air leakage. If it is not closed, it means that there is air leakage somewhere.
3. If there is no flameout, there is no need to turn it off in a hurry. At this time, first check the nearby pipes to see if there is inhalation. If there is inhalation, it means there is air leakage.
In addition to these two situations, we should be clear that the ignition, intake and nozzle of the engine determine the combustion of fuel and are also the power source of the engine. If the idle speed is unstable, we will also remove the ignition, air intake and nozzle of the engine.
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