What is the slight jitter when the engine is idling?

The cold car has idle speed, and the idle speed of the hot car is generally quiet. A slight jitter can't explain what's wrong with the engine. After driving for tens of thousands of kilometers, the throttle may be ok, and the new car will definitely be fine. It also has something to do with oil.

The easiest way to solve this problem is when idling, if the jitter is serious, you will obviously feel it in the car; If it is slight, you can pull open the engine compartment cover and put your hand on the engine protective cover (plastic cover) to feel it. Under normal circumstances, slight jitter is normal.

After cleaning and adjusting the idle speed control system, make sure that there is no fault in the idle speed control system, such as the working performance of the idle motor and whether the air intake system leaks. Then do a power balance test to judge the engine, so as to judge a cylinder that causes the idling value jitter, and then analyze and repair the fault source. It is recommended to take the car to the repair shop for the above inspection and maintenance.