What Causes Loud Engine Noise When Driving?
2 Answers
Reasons and solutions for loud engine noise when driving are as follows: 1. Cold weather causing increased engine idle speed. Solution: The noise will disappear after the engine warms up. 2. Loose plastic parts in the engine compartment. Solution: Replace or adjust the tightness. 3. Engine oil viscosity is too high. Solution: Change the engine oil. 4. Improper operation or severe wear of the valve guide hole, causing valve leakage due to poor sealing. Solution: Remove the cylinder head, grind the valves, check the valve spring tension, and readjust the valve clearance.
When the engine noise increases while driving, there are several common reasons to discuss. Part wear is an old issue, such as bearing rust or poor cylinder sealing, which can cause a humming sound during friction. Exhaust system problems are also common, where cracks in the muffler or leaks can make the exhaust sound noisy. From my experience, insufficient or dirty engine oil leads to poor lubrication, making the engine work harder and noisier; a loose fan belt can produce a squeaking sound that’s instantly annoying. High water temperature or poor air intake can also increase noise. It's advisable to regularly check the engine oil level and air filter, and perform timely maintenance. Don’t delay when noise appears—visit a repair shop promptly to inspect specific components. Minor repairs might cost just a few tens of dollars, whereas delaying could lead to major faults with higher costs. Safe driving is also important; smooth starts and avoiding sudden acceleration can reduce engine stress.
