What causes engine idle vibration?
2 Answers
Engine idle vibration mainly occurs due to the following reasons: 1. Excessive engine carbon deposits: After a certain mileage and duration of vehicle operation, some carbon deposits inevitably accumulate. Excessive carbon deposits can easily cause engine detonation and vibration, which is detrimental to engine power output, significantly increases fuel consumption, and pollutes the environment. 2. Unstable oil pressure: This is usually caused by abnormal fuel pump supply pressure, incorrect readings from the intake pressure sensor, or poor performance, leading to vehicle vibration. In such cases, it is necessary to conduct a comprehensive inspection of the vehicle's fuel supply system at a certified service station to identify any leaks and determine the cause of the vibration.
I've been driving since 1990 and encountered idle vibration issues too many times. Usually it's caused by worn engine mounts where cracked rubber fails to dampen vibrations, making the whole car shake; or it could be due to burnt-out spark plugs causing uneven ignition; clogged air filters or vacuum line leaks are also common culprits. I remember one severe case where the shaking nearly affected steering, but timely mount replacement fixed it. Regular engine maintenance like changing spark plugs every two years can prevent this. Though minor, prolonged vibration increases fuel consumption (especially with AC on) and may damage sensors. Safety first – get professional diagnosis immediately when detected, never attempt DIY fixes.
