Reasons for Engine Idle Vibration?
2 Answers
Engine idle vibration can be caused by the following reasons: 1. Blockage of the idle air orifice, preventing the idle system from functioning properly. Solution: Clean or unclog the air orifice. 2. Cold start: Insufficient combustion, leading to unstable idle. Solution: It is recommended to visit a 4S shop to check the intake pressure sensor. 3. Low engine temperature: The ECU detects this and increases fuel injection, causing the engine to accelerate and auxiliary heating to activate, resulting in unstable idle. Solution: It is recommended to visit a 4S shop to check the fuel supply pressure. 4. Issues with the engine intake system, engine air filter, or throttle carbon buildup. Solution: It is recommended to visit a 4S shop for a comprehensive inspection, repair, or maintenance.
To be honest, as an experienced driver with decades behind the wheel, engine shaking at idle is truly a headache. The most common issue is worn spark plugs—long-term use leads to carbon buildup or aging, causing uneven ignition and engine vibration. A dirty throttle body is another culprit, where dust and sludge accumulation disrupts smooth airflow and unstable RPM. Fuel system problems like clogged fuel injectors result in insufficient gasoline supply, making the car gasp for air. Faulty ignition coils are also troublesome, as high-voltage leakage causes cylinder misfires and more pronounced shaking. Loose or aged engine mounts with poor damping effects further amplify vibrations. I've personally replaced mounts and spark plugs before, and a simple throttle body cleaning can provide significant relief. The key is regular maintenance—like inspecting components every 10,000 kilometers—to prevent these annoying minor issues.
