Why is BYD s6 idling unstable?

The unstable idle speed of BYD s6 may be caused by excessive fouling on throttle and intake or fuel pressure failure. Too much fouling on the throttle valve and intake port: too much carbon and dirt are deposited on the throttle valve and the surrounding intake port, and the cross-sectional area of the intake port changes, which makes the control unit unable to accurately control idle intake, resulting in too rich or too lean mixture and abnormal combustion.

Common reasons are: the throttle has oil pollution or carbon deposition; There are oil stains and carbon deposits at the air inlet around the throttle; Idle stepper motor, duty solenoid valve and rotary solenoid valve are polluted by oil and carbon.

Fuel pressure fault: the oil pressure is too low, the fuel sprayed by the injector is in poor atomization state or the fuel sprayed is linear, and in severe cases, only oil droplets are sprayed, and the fuel injection quantity is reduced, making the mixture too thin; When the oil pressure is too high, the actual fuel injection increases, making the mixture too rich.

Common reasons are: fuel filter is blocked; The fuel pump filter screen is blocked; The pumping capacity of the fuel pump is insufficient; The spring force of fuel pump safety valve is too small; Deformation of oil inlet pipe; Fuel pressure regulator is faulty; The oil return pipe is compressed and blocked.

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