What Causes the Engine Noise When Accelerating in Third Gear on a Haval H2?
2 Answers
The causes of engine noise include engine misfire, improper use of engine oil, timing belt noise, and insufficient warm-up time. Below are some relevant details about the engine: Relatively Low Friction Torque: The engine's valve drive mechanism adopts a hydraulic support roller rocker arm structure. Compared to the hydraulic tappet valve drive mechanism commonly used in modern gasoline engines, this innovative design offers the advantage of relatively lower friction torque. Reduced Camshaft Weight: The use of a heat-sleeved camshaft not only reduces the weight of the camshaft compared to the original version but also allows the engine to achieve higher camshaft profile accuracy and more precise valve timing.
My Haval H2 also had the issue of the engine making a creaking sound during third-gear acceleration, and I remember it quite clearly. There could be several possible reasons: first, engine knocking, which is unstable fuel combustion during acceleration, producing a popping sound, often caused by excessive carbon buildup on the spark plugs or the use of low-quality gasoline; second, wear and tear on internal engine bearings or connecting rods, leading to abnormal friction noise under high load; another possibility is a loose or aged drive belt slipping and producing a screeching sound during acceleration. My solution was to first check the condition of the spark plugs and the engine oil level. If nothing seemed wrong, I took it to a professional shop to scan the engine codes with a diagnostic tool, which revealed the issue was with the spark plugs. Replacing them fixed the problem. Don’t ignore such abnormal noises, as prolonged issues could damage engine components, leading to more expensive repairs. Using higher-quality fuel and performing regular minor maintenance can help reduce such problems. If you hear any unusual sounds while driving, slow down immediately, pull over safely, and inspect the vehicle.
