What Causes the Loud Engine Noise in Honda Civic?

2 Answers
McJasper
07/24/25 2:22pm
Below is a detailed analysis of the specific reasons for loud engine noise in Honda Civic: 1. Engine oil issues: Engine oil is a crucial component for engine lubrication. When there are problems with the engine oil, it can affect the engine's operation. If the oil viscosity is too high, it can easily cause operational issues in the engine, reduce lubrication effectiveness, and lead to friction during engine operation, thereby generating noise. 2. Insufficient belt tension: When the engine belt tension is insufficient, the engine can produce sharp noises during operation, severely affecting the driver's experience. Solution: In such cases, adjusting the tension of the engine belt can prevent the noise.
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KarterFitz
08/11/25 8:10am
I used to work on Civics a lot, and loud engine noise is quite common. The most frequent cause is increased valve clearance—Hondas tend to develop this after tens of thousands of miles, and a simple adjustment can fix it. Another common issue is exhaust pipe leaks, especially at the joints where corrosion often occurs. During inspections, I apply soapy water to check for bubbles. Loose belts or chains can also cause squeaking, particularly noticeable during cold starts. Old or insufficient oil reduces lubrication, increasing friction noise, so regular oil changes are crucial. Carbon buildup shouldn’t be ignored either—excessive deposits affect combustion, and I recommend trying a cleaning additive. Ignoring these minor issues can lead to major engine repairs, which are far costlier. From a safety perspective, if you notice unusual noises, avoid long trips and get the trouble codes scanned at a shop—it’s both reassuring and practical.
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