What is the reason for the high engine speed of FAW Pentium X80?

Generally, the main reasons for excessive idle speed are excessive intake air or incorrect engine control signal, which leads to excessive idle speed, including air temperature sensor failure, water temperature sensor failure, throttle position sensor failure, air flowmeter or intake manifold absolute pressure sensor failure, switch signal failure, idle speed control valve failure or matching setting problems.

When the idle contact is disconnected, ECU will determine the fuel injection quantity and time according to the air flow sensor and crankshaft position and speed signals. However, at this time, the engine is idling, and the intake air is less, which leads to the mixture being too rich and the speed increasing. When the electronic control unit receives the rich mixture signal fed back by the oxygen sensor, it will reduce the fuel injection and increase the opening of the idle control valve, which will lead to the dilution of the mixture and the decrease of the vehicle speed. When the electronic control unit receives the lean mixture signal fed back by the oxygen sensor, it will increase the fuel injection amount and reduce the opening of the idle control valve, which will lead to excessive mixture and increase the speed, which will repeatedly make the engine idle unsteadily.

The engine speed is related to the work done per unit time or the effective power of the engine, that is, the effective power of the engine changes with the speed. The working condition of the engine at rated power and rated speed is called rated working condition. Speed, engine speed can generally reach 700 rpm at idle speed and 3000 rpm at normal operation.

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