What Causes the Loud Engine Noise in Haval Big Dog?
3 Answers
Haval Big Dog's loud engine noise is due to the oil not meeting lubrication requirements during cold starts, resulting in high RPM and loud noise. Below are the reasons for the loud engine noise in Haval Big Dog: Oil Not Meeting Lubrication Requirements: During a cold engine start, the temperature is relatively low, and the oil has not yet been distributed to all components. Additionally, the oil inside the engine has completely drained back into the oil pan due to prolonged parking. It takes about 1 minute of warm-up for the engine to achieve full lubrication, after which the idle speed returns to normal. High Engine RPM: To quickly bring the engine up to normal operating temperature, the RPM during a cold start is also higher. This is why the engine noise feels louder when starting a cold engine, and it may also be accompanied by some vibrations. Furthermore, due to the high idle speed and increased fuel injection, incomplete combustion may result in a noticeable gasoline smell.
Hey, I think the issue of the Haval Big Dog's engine noise becoming louder is quite common. I've seen it a lot after driving for over a decade. The main possible reasons are excessive carbon buildup in the engine, leading to uneven combustion; aging spark plugs or ignition system problems can also increase noise; poor fuel quality or using low-grade oil makes the engine work harder; slight exhaust pipe leaks can make the sound more harsh; plus, the air conditioning compressor and fan generate extra buzzing when running on hot days. It's recommended to check if the fluids are sufficient or dirty as soon as possible, perform regular carbon cleaning maintenance, or switch to a high-quality engine oil. Cars are like people—they need proper maintenance to stay healthy, otherwise small issues can turn into costly major repairs. Safety first, don’t ignore unusual sounds while driving, and get it fixed at a professional shop early on.
My Haval Big Dog's engine has been a bit noisy lately, which scared me into thinking something was wrong. After consulting with some fellow car owners, I learned about the common causes. Mainly, it could be due to unclean fuel—poor-quality gas affects combustion; the engine makes louder noises when overheating; the air conditioning compressor also contributes some noise when starting up; the spark plugs might need replacing; or the oil in the oil pan could be too thin or overdue for a change, amplifying friction sounds. I plan to take it to the 4S shop for a full check-up next week to prevent the issue from worsening. Fellow car owners advised maintaining smooth driving habits to reduce stress—avoid slamming the accelerator and stick to regular maintenance for peace of mind and safety. Also, keep an eye on the dashboard warning lights to address issues early and avoid unnecessary expenses.
