What are the symptoms of using low-quality fuel?

[OKira]

Cars using low-quality fuel may exhibit the following symptoms: difficulty starting or even failure to start; engine shaking at idle after starting; noticeable body vibration; foul-smelling exhaust gases; noisy valves; poor acceleration with high fuel consumption; gear shifting with impact. The vehicle maintenance solutions after using low-quality gasoline are as follows: 1. If the vehicle can currently drive normally without symptoms, promptly go to the nearest 4S shop for the following treatments: completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter. 2. If the vehicle drives normally but the engine idles with slight shaking: promptly go to the nearest 4S shop for the following treatments: completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the throttle body, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter and fuel pump. 3. Vehicles with starting difficulties, failure to start, engine shaking, poor acceleration, gear shifting impact, or noisy valves should be stopped immediately and request rescue from a 4S shop. Measure cylinder pressure; if the cylinder pressure is normal, disassemble the cylinder head for cleaning, completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the throttle body, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter and fuel pump. 4. If the engine fails to start and there is no cylinder pressure, with severe piston impact marks, the engine requires major overhaul. Completely drain the remaining fuel in the tank, refill with high-quality gasoline, clean the throttle body, clean the fuel injectors, clean the combustion chamber, and replace the fuel filter and fuel pump.