Idle jitter may be caused by the following four reasons:
1. The engine has serious carbon deposition.
The most common cause of automobile jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposit. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during the cold start, which leads to the lean mixture during the cold start and makes it difficult to start. In this case, only when the gasoline adsorbed by carbon deposits is saturated, it is easy to run into the car. After running into the car, the gasoline adsorbed on carbon deposits will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will thicken the mixture and dilute the combustible mixture of the engine, resulting in idling jitter after cold start.
2. Ignition system problem
Check the working conditions of spark plugs, high-voltage lines and ignition coils. Poor working conditions of ignition system and spark plug can also lead to such failures.
3. The high voltage line is broken.
Open circuit of high-voltage line refers to the open circuit of conductor core of high-voltage line, which will affect ignition and cause engine jitter. The resistance can be measured with a multimeter, and the resistance that is obviously several times larger can be replaced.
4. Low idle speed
The engine idle speed value has been set in the computer. When the number of revolutions is low to a certain range, the on-board computer will automatically adjust. If the idle speed is too low, it is beyond the control range of the computer. Some cars have adjusting screws on the accelerator to adjust the idle speed.
(Photo/Text/Photo: Li Shuiqing) @20 19