Stop the car in the same place, shake it and add a little oil. What is the reason?

In fact, there are many reasons for the engine to shake in the cold state, which can lead to this state of the car.

Throttle is too dirty

Too much grease at the throttle inlet leads to a decrease in air intake. There is a diverter plate in the middle of the throttle. The height of idle speed depends on the opening angle of the diverter plate. The more intake air, the higher the engine speed. Similarly, in the cold state, the opening of the diverter plate is relatively small. Too greasy will lead to a decrease in air intake, so the idle speed is unstable.

Idle motor is too dirty

The idle motor is telescopic. In fact, there are many reasons for the unstable idle speed of many cars. The idle motor can work normally when the car is hot, but it will be unstable when the car stops for a while, because the greasy in the middle will solidify after the idle motor cools down, resulting in the strength of the idle motor being insufficient to support the expansion, but it will be fine when the car is hot.

Spark plug

Whether the spark plug is weak or leaking, if it is slight, it can only be felt when it is parked. Weak spark plug leads to insufficient explosion of mixer, and electric leakage will lead to slight cylinder missing. This situation is unprofessional and the owner may not realize it.

The ultimate cause of this problem is actually that the owner has not set a time for the maintenance of his car. The throttle and nozzle should be cleaned at the specified time, instead of waiting for the problem to appear during cleaning. If the problem lies in cleaning, it may not work, and the problem can only be solved by replacing parts. The cleaning kilometers of throttle and nozzle are between 20,000 and 30,000. Of course, this is not a dead beat. You need a car to run there to decide the cleaning time.

The replacement time of spark plugs is between 40,000 km and 60,000 km. Car owners can take this as a hard condition. There is no need to risk seeing how many kilometers your car has run in order to run 10 thousand to 20 thousand kilometers more. If the throttle is not cleaned for tens of thousands of kilometers, it is recommended to clean the throttle first, and then check the spark plug and ignition coil. The normal situation is the throttle problem.