Engine Abnormal Noise?

[McBrantley]

Possible causes and solutions for engine abnormal noise are as follows: 1. Engine misfire: When the engine misfires, the vehicle may exhibit symptoms such as increased engine noise, unstable idle speed, and abnormal body vibration. Solution: Inspect cylinder condition and spark plug operation, replace spark plugs if necessary. 2. Improper oil usage: If the oil viscosity is too high, internal components won't receive effective lubrication, causing abnormal noise from part friction. Solution: Check engine oil and always use the correct oil grade specified in the vehicle manual during routine maintenance. 3. Timing belt noise: Improper timing belt tension may cause abnormal sounds. Solution: Readjust the belt tension. 4. Insufficient warm-up time: When the vehicle is first started, oil fluidity is poor and some components lack proper lubrication. Solution: Allow sufficient warm-up time until the engine reaches normal operating temperature.