What's wrong with Pentium B50 idling instability and engine jitter without fault code?

The most common reasons for engine idling instability in Pacific Auto Network are that the throttle valve is too dirty or the fuel injector has too much carbon deposit, and the combustion in the cylinder is not good. If the power provided by the car is not enough, the car will shake. There is too much carbon and dirt in the throttle and the surrounding air intake, and the cross-sectional area of the air passage changes, which makes the control unit unable to accurately control the idle intake, resulting in the mixture being too rich or too thin, which makes the combustion abnormal.

Slight jitter is normal. If the jitter is serious, it needs to be checked.

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.

There are many reasons, mainly the following lack of cylinders. Check the cylinder line to see which cylinder line is not on fire. The cylinder liner is of poor quality. Replace the cylinder line in the factory. Idle speed is too low. Engine stability angle is aging, replace it. Poor contact of distributor, ignition coil problem, air flowmeter problem, and incorrect cylinder pressure. There are many reasons, all of which can cause engine jitter, and there are some other reasons that should be treated specifically.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)