What causes the loud engine noise when driving the Song Plus?
3 Answers
Song Plus may produce loud engine noise due to poor sound insulation, insufficient coolant, or the engine not adapting to the oil viscosity. Below are detailed explanations and solutions: Engine adaptation issue: After prolonged driving, engine oil gradually thins and carbon deposits accumulate. When new oil is replaced, the engine may not immediately adapt to the oil viscosity, potentially causing higher RPMs and consequently louder engine noise. This noise may decrease after oil replacement or with extended usage. Poor sound insulation: Loud noise may result from inadequate engine sound insulation. Inspect the vehicle's sealing strips - if they show signs of aging, replacement is necessary. Insufficient coolant: Coolant levels can drop in low temperatures, leading to increased engine noise. Adding coolant can resolve this issue.
Last time I drove my brother's Song Plus on the highway, I noticed the engine was buzzing loudly. After careful consideration, there might be several reasons for this: first, the engine oil needs to be changed—either the viscosity is insufficient or it hasn't been changed for too long, which affects lubrication, causing the engine to grind and sound louder; second, frequent low-speed driving in city traffic jams leads to carbon buildup, making the engine run less smoothly; another possibility is that the engine mounts have aged, reducing their damping effect, allowing vibration noise to enter the cabin. I recommend checking when the last maintenance was done. If it's been over six months since the oil was changed, it's time to visit the 4S shop for a comprehensive inspection. Engine noise issues should never be taken lightly.
With over a decade of car repair experience, I've encountered many similar cases. The louder engine noise in the Song PLUS is usually related to these components: a loose exhaust system interface causing air leaks produces a puffing sound, damaged turbocharger blades create a sharp whistling noise, and worn engine belt tensioners generate a low-frequency hum. Loud noise during cold starts is normal, but persistent abnormal sounds require attention. I recommend focusing on inspecting the turbo and belt pulley conditions, and using a stethoscope to locate the source of the noise is more reliable. Also, it's essential to read the fault codes from the onboard computer to rule out false sensor reports.
