In 2007, VIOS 1.3 displacement engine had a crisp sound.

In 2007, VIOS 1.3 displacement engine made abnormal noise for the following reasons.

1, excessive carbon deposit in engine, throttle and spark plug.

2. The air filter element is too dirty, resulting in poor filtration.

3. The gasoline label is too low.

4, spark plug aging, car idling failure.