W Jiangling Guowu light truck has just been bought for a few months, and the S ⅴ S light and emission fault indicator light have been on all the time. The computer shows that the current fault is the

W Jiangling Guowu light truck has just been bought for a few months, and the S ⅴ S light and emission fault indicator light have been on all the time. The computer shows that the current fault is the activation of vehicle performance restriction function. The main reasons are incorrect ignition advance angle, low fuel pressure, air leakage in intake system, fault of throttle position sensor or air flow meter, poor operation of injector and EGR system.

Crankshaft angle from ignition time to piston reaching compression top dead center. The ignition advance angle that can make the engine get the best power, economy and emission is called the best ignition advance angle.

The biggest factors affecting the ignition advance are the rotational speed and the combustion speed of the mixture. With the increase of rotating speed, the time to turn the same angle becomes shorter, and only a larger advance angle can get the corresponding advance time. The combustion speed of mixture is related to the composition of mixture and the structure of engine, such as the shape of combustion chamber and compression ratio.

The five systems of an automobile engine include:

1, cooling system: mainly used to cool the engine.

2. Fuel system: mainly responsible for providing fuel for the engine.

3. Ignition system: mainly ignites the mixed gas, but the mixed gas burns. There is no diesel engine.

4. Starting system: it is mainly used to make the stationary engine drive the car to rotate.

5. Lubrication system: it is mainly used to lubricate the mechanical parts of the engine.