Why does the engine shake slightly at idle?
2 Answers
Reasons for slight engine shaking at idle: severe engine carbon deposits, ignition system failure, unstable oil pressure, and aging engine components. Below is relevant information about automotive engines: 1. Introduction: The automotive engine is the device that provides power to the vehicle, serving as the heart of the car, determining its power, fuel efficiency, stability, and environmental performance. 2. Automotive engine maintenance: (1) Regularly change the engine oil and oil filter. As the oil passes through the fine holes of the oil filter, solid particles and viscous substances in the oil are trapped in the filter. (2) Regularly maintain the radiator. Rust and scale in the engine radiator are the most common issues. Rust and scale can restrict the flow of coolant in the cooling system, reducing heat dissipation and causing the engine to overheat, potentially leading to engine damage.
As an experienced DIY car enthusiast, I find that engine shaking at idle is quite common and mainly related to several mechanical issues. The most frequent cause is worn-out spark plugs or excessive carbon buildup, which leads to uneven ignition and unstable cylinder operation. A clogged air filter is another culprit; without sufficient airflow, the engine struggles and vibrates. Loose or damaged engine mounts can also reduce vibration damping, making the car shake when stationary. If ignored long-term, this shaking may increase fuel consumption or even damage core engine components. I recommend first using an OBD scanner to check for trouble codes. If you find relevant codes like P0300 (random/multiple cylinder misfire), it’s likely an ignition issue—replacing spark plugs or cleaning carbon deposits can resolve most of the problem.
