Reasons for Vehicle Vibration at Idle Speed
2 Answers
Reasons for vehicle vibration at idle speed: 1. Dirty throttle body; 2. Excessive carbon deposits inside the engine; 3. Faulty spark plugs or ignition coils; 4. Unstable oil pressure; 5. Aging engine mounts. Solutions for vehicle vibration at idle speed: 1. Clean the throttle body and remove engine carbon deposits in a timely manner; 2. Inspect spark plugs, high-voltage wires, and ignition coils; 3. Check oil pressure and replace damaged components if necessary. Methods for troubleshooting and resolving engine idle vibration issues: 1. Inspection of the idle speed control motor; 2. Inspection of the throttle position sensor; 3. Inspection of fuel injectors and crankshaft position sensor.
I previously experienced idle shaking while driving, which I thought was quite common. The most likely cause was aging or faulty spark plugs, as prolonged use leads to electrode wear and inaccurate ignition, causing the engine to shake. Another issue could be a faulty ignition coil—it acts like an igniter, and when it fails, it causes certain cylinders to stop working, resulting in severe shaking. Excessive carbon buildup in the throttle body can also disrupt airflow, leading to unstable idling, which I noticed is especially obvious in winter. Fuel system problems, such as clogged fuel injectors or a weak fuel pump, can cause insufficient fuel supply and affect combustion stability. Additionally, loose engine mounts are a physical cause; when the rubber deteriorates, the damping effect weakens, making the car feel like it's trembling. Excessive carbon deposits are even more common—when the combustion chamber gets dirty, the air-fuel ratio becomes unbalanced. I recommend regularly checking and replacing spark plugs every two years, cleaning the air filter, and occasionally driving at high speeds to burn off carbon deposits. Ignoring idle shaking can damage the engine, increase fuel consumption, and reduce driving comfort. It's best to visit a reputable repair shop to quickly diagnose and fix the issue using diagnostic codes.
