What is the reason for the high idle speed of Beiqi Wangwei m20? These reasons are the most common.

The fuel pump and oil system will affect the fuel pressure. For example, if the pressure is too low, the actual fuel injection quantity of the injector coil will decrease, the spray quality will become worse and the idle mixture will become thinner under the same power-on time. If the pressure is too high, there will be too much fuel injection and too rich mixture. The pressure of fuel system is related to the technical conditions of fuel pressure regulator, fuel pump and oil pressure solenoid valve and their circuit working conditions.

2, idle switch signal circuit reason:

The engine control computer (ECU) judges whether the engine is idling according to the potential of the idle switch signal (IDL terminal). When the idle contact is closed and the low potential is input to the IDL terminal of ECU, ECU judges that the engine is in idle working state, so it starts the idle control program to control the engine operation. Due to improper adjustment of idle contact clearance, poor contact, damage and circuit failure, engine ECU will not be able to correctly judge idle working conditions, resulting in idle control errors and various idle failures. Therefore, attention should be paid to the inspection, and this possibility should be ruled out first.

3.EGR valve opens at idle speed:

Fault analysis EGR valve only opens when the engine is under light load. The function of EGR is that part of exhaust gas enters the combustion chamber, which lowers the combustion chamber temperature and reduces Nox emission. However, too much exhaust gas participates in combustion, which will affect the ignition performance of the mixture, thus affecting the dynamic performance of the engine, especially when the engine is idling, low speed and light load (at this time, ECU controls the exhaust gas not to participate in combustion to avoid affecting the engine performance). If the EGR valve is opened when the engine is idling and the exhaust gas enters the combustion chamber to participate in combustion, the combustion will become unstable and sometimes even catch fire.