What Causes Abnormal Noises in a Car Engine?

[VonIsabelle]

There are many reasons that can cause abnormal noises in an engine, such as excessively high oil viscosity, improper timing belt tension, exhaust system failure, cooling system issues, etc. Inappropriate Engine Oil: If the oil viscosity is too high, it can lead to insufficient lubrication of the engine, causing friction and resulting in abnormal noises. Timing Belt Noise: If the timing belt tension is insufficient, prolonged use can cause the belt to stretch under excessive force, producing a squeaking noise. It may require adjustment of the belt tension at a repair shop or, in severe cases, replacement. Exhaust System Fault: Very loud noises coming from the exhaust pipe are mainly due to issues in the exhaust system. Check if the exhaust pipe is cracked. External Engine Components Causing Noise: Components such as worn engine mounts, water pumps, bearings, etc., can be relatively difficult to diagnose and may require a professional mechanic for accurate assessment. Cooling System Issues: If there is a hissing sound when starting the engine and the engine overheats, the cooling system should be inspected.