What is the reason for the clicking sound in the cold engine of the Highlander 3.5?

[VonJoanna]

When the engine makes abnormal noises during cold starts, it may be due to a broken or frayed timing belt. It is also necessary to check whether the car's starter has a position deviation or whether the belt connected to the starter is aging. Below are the reasons for abnormal noises in cars: 1. Damage to the front wheel steering knuckle: Generally, it is caused by damage to the half-shaft CV joint, which increases friction and produces noise when turning. 2. Damage to chassis suspension components: Damage to the ball joint or tie rod often causes inappropriate wear, increasing friction when turning, which naturally produces noise. 3. Damage to the front wheel bearing: Usually caused by a lack of lubricant. The direct friction between two mechanical parts increases when turning, resulting in noise. 4. Damage to power steering or steering system components: This could be due to long-term use leading to mechanical damage. Two incompatible mechanical parts will collide when turning, producing noise.