How to Solve Loud Car Engine Noise?
2 Answers
There are many reasons for loud car engine noise. Below are the causes and solutions for loud car engine noise: 1. Engine Mount Deterioration or Loosening: Engine mounts are rubber blocks placed between the engine and the frame. Their purpose is to reduce vibrations and shocks from engine operation and to secure the engine. Once these mounts deteriorate or loosen, the engine will shake, and the faster the speed, the louder the shaking noise. Solution: Tighten or replace the engine mounts. 2. Improper Engine Oil Quality: On one hand, if the oil viscosity does not match the engine, it can easily cause carbon buildup, leading to increased engine noise. On the other hand, if the oil viscosity is too low, it can result in insufficient lubrication, causing wear on engine parts and abnormal noises. If the oil viscosity is too high, it can overload the engine, also producing noise. Solution: Use the oil grade specified in the vehicle manual and avoid mixing different brands of oil. 3. Engine Misfire: Engine misfire mainly refers to one or more cylinders not functioning properly. Common symptoms include intermittent exhaust flow and severe shaking of the exhaust pipe, with clear "popping" or "thumping" sounds from the engine. Solution: Check the condition of each ignition coil and spark plug. 4. Drawbacks of Direct Injection: Direct injection engines often produce more noise because the fuel injection pressure is ten times higher than that of conventional engines. The high-pressure injection from the fuel injector causes vibrations, making it particularly easy to hear a "ticking" sound during quiet or slow driving. Solution: Install engine soundproofing insulation to reduce noise. 5. Timing Gear Noise: After prolonged use, along with improper gear clearance adjustment or hardened gear belts, excessive wear can occur. In severe cases, gear teeth may wear down, causing loose gear meshing and producing a "clattering" sound during operation. Solution: Tighten or lubricate the gear belt and replace any damaged gears. 6. Engine Carbon Buildup: Carbon buildup is inevitable in cars, including carbon deposits in the cylinders, throttle, spark plugs, and intake pipes. When there is excessive carbon buildup inside the engine, the ignition energy, air intake efficiency, and fuel mixture ratio are affected, leading to unstable power output, shaking during idling and acceleration, and noise entering the cabin. Solution: It is recommended to visit a 4S shop for targeted engine cleaning to remove carbon deposits.
I've been fixing cars for twenty years, and when encountering loud engine noises, I always start by listening to the source. The most common issue is exhaust pipe leaks, especially at the joints where rust and cracks form—it sounds like a broken gong, and replacing the clamp usually solves it. If the engine oil hasn't been changed for too long, it can also cause a gurgling noise. Last week, a young man's Honda had black, sludge-like oil, and the noise disappeared immediately after an oil change. A loose or slipping belt will produce a squeaking sound—here’s a quick trick: drip some water on the belt; if the noise stops, that’s the culprit. Oh, and worn-out engine mount bushings can cause a rumbling vibration—it’s like wearing out the soles of your shoes, and the whole set needs replacement.
