Why does the car occasionally shake at idle speed?

1 Answers
DiAndres
07/29/25 7:17pm
Car occasionally shaking at idle speed is due to engine misfire, which is caused by a malfunction in the ignition system. Automotive engines are equipped with an ignition system, the main components of which include the ignition coil and spark plugs. Spark plugs are wear parts that require regular replacement. Prolonged use of spark plugs leads to an increase in the electrode gap. If the electrode gap becomes too large, it will result in weaker ignition energy. Insufficient ignition energy can prevent the combustible mixture in the engine from burning completely, affecting the engine's power and fuel economy. If spark plugs are not replaced for an extended period, it can lead to engine misfire. The ignition coil is also a crucial component, used to increase voltage. The ignition coil is connected to the spark plug, and if the ignition coil is damaged, the spark plug will not receive sufficient energy to ignite.
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