Geely GX7 fault light is on, and the throttle is thirty or forty yards up and down.

1. Electromagnetic interference caused by insufficient idle power generation of alternator.

Insufficient idle power generation will lead to the nonlinear signal distortion of alternator, and electromagnetic interference will affect the fuel injector, which will cause the engine to shake slightly at idle speed and return to normal after starting.

2. When the engine speed is lower than1500rpm, the power is insufficient.

The nonlinear signal distortion of the generator sometimes affects the deflagration sensor, causing the deflagration sensor to send out the deflagration signal wrongly, causing the ignition advance angle of the engine to be delayed too much, causing the engine to obviously lack power at idle speed and light load, leading to idling jitter and poor acceleration at light load.

I feel heavy when I step on the accelerator for the first time every day.

① If the idle stepper motor and idle control valve are too dirty and stuck, it will feel heavy to step on the accelerator for the first time every day. In severe cases, you need to step on the accelerator pedal slightly to complete the start.

② During driving, when the accelerator pedal is completely released, the engine stops fuel injection. When the engine speed drops to 1500 r/min, start the stepping motor to resume fuel injection. However, the throttle valve of the straight-through idle control system is stuck due to excessive carbon deposition, and the idle control valve of the bypass idle control system is stuck due to dirt, which leads to the untimely start of the stepping motor, which makes the engine overload and flameout, and even causes the car to stall at low speed.

4. Unstable idle speed

The reason of unstable idle speed is that the idle stepping motor is too dirty or the injector is blocked. The main reason for the early blockage of injector is that the fuel grade is too low and the olefin content in the low-grade fuel is high.

5. Air leakage in the intake manifold

When air, gasoline vapor and combustion exhaust gas that should not enter enter the intake manifold, the mixture is too rich or too thin, which leads to unstable idle speed of the car.

6. The throttle has too much carbon deposit.

Too much carbon is deposited in the throttle valve and the surrounding air intake, and the cross-sectional area of the air passage changes, which makes the control unit unable to accurately control the idle intake, and also causes the mixture to be too rich or too thin, which leads to the unstable idle speed of the automobile.

7, ignition system failure

Failure of ignition module, incorrect gap of spark plug, ablation or damage of spark plug electrode, excessive resistance of high voltage line and other faults lead to the reduction of ignition spark energy or fire, which leads to unstable idle speed of the car.