What causes the idle vibration of the Trumpchi GS4?
2 Answers
The reasons for the body vibration of the Trumpchi GS4 at idle: 1. Severe engine carbon deposits. The most common cause of car vibration is a dirty throttle or excessive carbon deposits in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. In this situation, the engine will only start easily once the carbon deposits have absorbed enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits will be drawn into the combustion chamber by the engine's vacuum suction, making the air-fuel mixture too rich. The engine's combustible mixture alternates between being too lean and too rich, causing idle vibration after a cold start. 2. Ignition system issues. Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor ignition system performance or weak spark plug firing can also lead to such faults. 3. Unstable fuel pressure. If the fuel pump's supply pressure is abnormal or the intake pressure sensor's readings are incorrect or malfunctioning, it can cause body vibration. The solution is to check the fuel pressure and replace components if necessary. 4. Aging engine components. Engine mounts are essentially the shock absorption system of the engine. They absorb minor vibrations during engine operation. If the engine mounts are faulty, these vibrations will be transmitted to the steering wheel and the cabin, causing vibration at idle.
Speaking of the idle vibration issue with the Trumpchi GS4, I've encountered quite a few cases like this. The most common cause is aging engine mounts. Those three rubber blocks harden and crack over time, completely losing their vibration damping function - you'll feel the steering wheel and seats shaking at idle. Another possibility is severe throttle body fouling, where carbon buildup jams the valve movement, disrupting the ECU's air intake control. Worn spark plugs with enlarged gaps can also cause uneven ignition leading to vibrations, especially noticeable in vehicles over 40,000 kilometers. A lesser-known factor is fuel quality - using substandard gasoline or ethanol-blended fuel beyond specifications results in unstable combustion and pronounced shaking. Here's a diagnostic tip: next time try turning on the AC - if the vibration suddenly worsens, it's almost certainly the engine mounts. For such cases, I'd recommend visiting a repair shop promptly to scan the data stream with diagnostic equipment for accurate troubleshooting.
