Why Does the Engine Slightly Shake at Idle Speed?
2 Answers
Reasons for engine idle shaking: 1. Dirty air filter: The air filter is designed to protect the engine and reduce wear, simply replace the air filter. 2. Broken high-voltage wire: A broken high-voltage wire refers to the core wire being broken, which can affect ignition and cause engine shaking. 3. Low idle speed: The engine idle speed value is preset in the computer. When the RPM drops below a certain range, the car's computer will automatically adjust it. 4. Abnormal water temperature: The engine operating temperature has a normal range. If the water temperature is too high, it can lead to advanced ignition timing, changes in the air-fuel mixture ratio, thinning of the engine oil viscosity, and poor lubrication performance. 5. Clogged fuel injector: The fuel injector in an electronic fuel injection vehicle is a key component for fuel injection, with a long service life that can reach hundreds of thousands of kilometers. However, due to gum in gasoline, the injector nozzles can become clogged, causing inconsistent fuel injection amounts from each injector. This leads to uneven operation of each cylinder and results in engine shaking.
As a seasoned driver with over a decade of experience, I've encountered slight engine vibrations at idle a few times before. Common causes include minor faults in spark plugs or ignition coils leading to uneven cylinder ignition, or excessive carbon buildup in the throttle body restricting air intake and causing unstable engine operation. I recommend regular spark plug replacement and throttle body inspections every 50,000 km or so – cleaning a dirty throttle with spray cleaner is simple. Clogged fuel injectors can also be an issue, affecting fuel spray uniformity; adding fuel additives can help. Prolonged carbon buildup worsens vibrations and may even cause component wear. Don't neglect routine maintenance – I get a comprehensive checkup annually to address minor issues early, saving money and ensuring safety. Safe driving is crucial; don't let vibrations escalate into dangerous stalling situations.
