Causes of idling jitter of new car engine
(2) There is too much carbon deposit in the spark plug, because some new cars will drive from place A to place B manually before they are bought back, and a certain amount of carbon deposit has been produced in the long-distance process.
(3) Fuel system problems. Some new cars have been parked for a long time before they are sold. During this period, no oil circuit was used, so there was a certain amount of grease and the blockage occurred.
(4) The oil was not changed in time during the running-in period, because a large amount of metal chips ran repeatedly during the running-in period, resulting in slight jitter.
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Solutions to engine jitter
1. The most common cause of serious engine carbon deposition leading to vehicle jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposition. 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 cold start, which leads to the lean mixture during 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. The lower the temperature, the more oil is needed for cold start, and the existence of carbon deposit will affect the smooth start.
Solution: clean the oil circuit, check whether there is carbon deposit in the idle motor, and clean it.
2. Ignition system problems Check the working conditions of spark plugs, high-voltage lines and ignition coils. Poor ignition system and poor spark plug misfire can also lead to such failures.
Solution: Check whether there is too much carbon deposit in the spark plug and replace the spark plug.
3. The oil pressure is unstable. If the engine carbon deposit has been cleaned, the throttle valve has been cleaned, the oil pad and spark plug have been replaced, and the body is still shaking at idle speed. I suggest you go to the 4S shop to check whether the oil supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal or the value of the intake pressure sensor is wrong, the car body will shake.
Solution: Check the oil pressure and replace parts if necessary.