What is the reason for the humming sound when accelerating in fourth gear of Wuling Zhiguang?
2 Answers
The reasons for the humming sound when accelerating in fourth gear of Wuling Zhiguang are as follows: 1. Engine fuel pump malfunction: Damage to the engine fuel pump results in insufficient fuel supply. Even if the driver floors the accelerator, causing the engine speed to increase, the fuel injection volume remains low, leading to reduced engine output power and consequently weak acceleration. 2. Valve timing issue: Modern engines utilize CVVD valve timing systems to improve fuel efficiency. However, if the CVVD hydraulic control system is damaged, with oil leaks from sealing rings or malfunctioning CVVT, the engine's intake and exhaust will be affected, naturally reducing combustion efficiency and causing a drop in engine output torque.
I've encountered similar issues while driving. The buzzing noise usually occurs when accelerating in fourth gear, likely caused by unbalanced or worn driveshaft vibrations. I remember my old car had similar problems, especially at high speeds where the noise kept getting louder. If the driveshaft isn't regularly checked for balance, or if the mounting points become loose, it can easily produce resonance sounds in higher gears. Additionally, unstable exhaust pipe mounting can transmit vibrations to the vehicle body, particularly in older models. Don't ignore this, as it may lead to accelerated wear of transmission components and even affect driving safety. I recommend going to a repair shop immediately for a comprehensive inspection to check the driveshaft, exhaust pipe brackets, and engine mounts. Paying attention to these points before driving can prevent major repairs. Personal experience tells me that early intervention always saves money!
