What Causes Abnormal Noise After Vehicle Startup?
2 Answers
Car starting with abnormal noise is caused by engine belt failure. The following are the cause analysis and solutions: Engine belt aging or improper tension: The car's engine periphery has many belts that connect to the generator, water pump, air conditioning compressor, power steering pump, etc. Belts are rubber products, so long-term use will lead to aging and wear. At the same time, improper belt tension can cause abnormal noise when the engine starts. Fault solution: First, check whether the engine belt tension is appropriate and make corresponding adjustments. Secondly, check the elasticity of the belt and whether there are cracks on the surface. Replace the belt if necessary.
I've been driving for twenty years and often encounter strange noises after starting the car. For example, the other day there was a sudden squeaking friction sound in my car, which turned out to be caused by a loose and worn-out alternator belt. Belt aging, water pump bearing wear, or cracks in the exhaust pipe can all produce similar sounds, especially noticeable during cold starts. Experience tells me that a simple way to identify the issue is to listen for the source of the noise after starting: squeaking under the hood is often related to the belt or tensioner pulley, while buzzing or hissing from under the car might indicate an exhaust problem. Don’t underestimate it—delaying repairs risks belt breakage, which can suddenly cause loss of power steering or electrical failure while driving, posing serious danger. I recommend doing a quick pre-drive check for cracks or slack in the belt, and if needed, promptly take it to a professional shop for replacement and maintenance. Spending a little now can save big later and avoid the embarrassment of breaking down halfway. Remember, safety comes first—strange noises are no small matter.
