The Best Car Shaking At Idle Check Engine Light On References. The problem can be a dirty, failed or failing mechanical component or one of many sensors. Web although obvious, when the check engine light is on, it means an engine sensor is sending abnormal data to the computer (ecm).
Generally, the idle air control valve is in charge of controlling the engine’s idle speed by letting some air pass through the throttle body’s throttle plate. Other things such as a faulty idle air control valve may cause the engine idle to drop below the normal idling rpm which may also cause the motor to shake or vibrate more than normal. Web loose or missing gas cap if your check engine light is on and it turns off when you replace or tighten your gas cap, this was likely the source of your woes.
