What is the problem when the car won't move?

[VonGenevieve]

Here is the explanation about the issue when the car won't move: 1. Problem one: The throttle valve has some relationship or interaction with the poor low-temperature fluidity of engine oil. 2. Problem two: If the throttle valve hasn't been cleaned for over 7,500 kilometers, excessive dirt on the throttle valve and too much carbon buildup in the intake tract, fuel injectors, and intake valves can cause malfunctions. The uneven fuel quality and congested urban road conditions are all reasons for carbon buildup formation. During cold starts, the gasoline sprayed by the fuel injectors is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts, making it difficult to start. 3. Problem three: If the fuel system hasn't been cleaned for over 40,000 kilometers, the fuel pump and fuel lines may be too dirty inside. 4. Problem four: If the battery hasn't been replaced for over 3 years, it can cause the cold start voltage to be too low.