What Causes Engine Idle Vibration When the Car is Warm?
2 Answers
Hot engine idle vibration is caused by: 1. An inappropriate air-fuel mixture ratio in the car engine compartment, which affects engine vibration; 2. Spark plugs that have been used for too long, aging ignition coils, aging high-voltage wires of the spark plugs, and leakage issues that can reduce ignition capability; 3. Carbon deposits formed on the valves and intake ports inside the engine. Carbon deposits can absorb a significant amount of fuel, affecting the sprayed air-fuel mixture, resulting in reduced car power and malfunctioning of the water temperature sensor. The car engine is the device that provides power to the car, determining its power, fuel efficiency, stability, and environmental friendliness.
Engine idling shake when the car is warm is quite common in my opinion, mostly due to issues with the ignition system or fuel system. Worn-out spark plugs with carbon buildup can cause unstable ignition when the engine heats up, leading to noticeable shaking. Or if the fuel injectors are clogged, causing insufficient fuel pressure and an imbalance in the air-fuel mixture, the shaking can feel like shivering. A dirty throttle body can also affect it by making the air intake unstable. I've experienced this in my own car, and it improved significantly after replacing the spark plugs and cleaning the fuel injectors. Also, check if the engine mounts are loose—excessive vibration can cause shaking. Faulty sensors, like the oxygen sensor, can mislead the ECU. It's advisable to visit a repair shop to read the fault codes first, to avoid potential worsening problems. Regular maintenance and cleaning of these components can prevent such issues.
