What happened when Pentium T99 engine started?

When the engine is started, the engine jitter is caused by serious carbon deposition, ignition system problems, unstable oil pressure, aging engine components and other reasons. The most common causes of engine jitter are dirty throttle or excessive carbon deposition in injector.

The engine has serious carbon deposition.

When there are too many carbon deposits in the throttle valve, fuel injector and air intake or the engine, the gasoline sprayed by the fuel injector in cold start will be absorbed by a large amount of carbon deposits, which will lead to too thin mixture during cold start and make the engine shake.

There is something wrong with the ignition system.

The ignition coil is a transformer, which is responsible for converting the low-voltage current of the vehicle into high-voltage electricity, so that the spark plug can have enough voltage to generate sparks. Once the ignition coil fails, such as self-breaking, air leakage, etc., it will cause the ignition ability of the spark plug to be insufficient or missing, and then the mixed gas in this cylinder will not deflagrate, resulting in engine cylinder shortage, starting difficulty and acceleration jitter.

Oil pressure instability

After the engine is used for a long time, the gaps between each cylinder liner and piston will be inconsistent, that is to say, some gaps are large and some gaps are small. When the engine is cold-started, there is no good oil lubrication, and the cylinder with a large gap is easy to leak some high-temperature gas from the gap, thus reducing the power output, making the oil pressure and cylinder pressure low, leading to insufficient power and making the engine shake.

Aging of engine parts

Engine jitter is also related to engine foot aging. The engine foot is the shock absorption system of the engine. The slight vibration of the engine during operation can be absorbed by the engine feet. When there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing the engine to shake when starting.