What Causes Intermittent Engine Idle Vibration?
2 Answers
Engine idle intermittent vibration causes: fuel quality issues, severe engine carbon buildup. Specific explanations are as follows: Fuel quality issues: The function of fuel is to supply the engine with a certain amount of clean, well-atomized gasoline according to the operating conditions. If there are problems with fuel quality, the gasoline quality deteriorates. Therefore, the engine may vibrate, which can be resolved by switching to higher-quality fuel. Severe engine carbon buildup: Engine carbon buildup has always been a serious issue. It can be addressed by switching to higher-quality fuel or purchasing carbon removal products available on the market.
My car has had this issue several times. The engine occasionally shudders at idle and then stops. Most of the time, it's the ignition system causing trouble—worn spark plugs or poor contact in the high-voltage coil leading to unstable spark jumps. Another common issue is carbon buildup; the intake manifold and fuel injectors get clogged with sludge, causing uneven fuel delivery and resulting in shaking. Then there are those small sensors, like a faulty oxygen sensor sending wrong signals, making the computer unable to control the idle rhythm. A cracked or leaking vacuum hose can also make it shudder. If there's too much carbon buildup, the air filter should be replaced too, as poor airflow can worsen the problem. It's recommended to regularly maintain the spark plugs, replacing them every 30,000 kilometers, and clean the throttle body to prevent carbon buildup. Don't delay repairs—it can lead to soaring fuel consumption and damage the engine's core components. Safety comes first when driving, so take it to a professional shop to scan for trouble codes and fix the issue precisely.
