What Causes Abnormal Noises in the Chassis After Starting?
2 Answers
The reasons for abnormal noises in the chassis after starting are: 1. Excessive clearance between the engine piston and cylinder wall; 2. Over-tight assembly of the engine piston pin or connecting rod bearing; 3. Pre-ignition caused by engine overheating; 4. Opposite orientation of the major and minor axes of the engine piston skirt ellipse; 5. Excessive loosening of the connecting rod bearing cap fixing bolts or complete melting and detachment of the connecting rod bearing alloy. The chassis consists of four parts: the transmission system, the running system, the steering system, and the braking system. It supports and installs the car engine and its various components and assemblies, forms the overall shape of the car, bears the engine power, and ensures normal driving.
My car also had a chassis noise issue after starting a few years ago. At that time, the sound was like a metallic squeaking noise, and the inspection revealed that the steering tie rod ball joint was worn and loose. When accelerating from a start, the increased pressure on the chassis made the noise particularly noticeable. Later, when I took it for repairs, the mechanic mentioned that fatigue in the suspension system's shock absorbers or springs could also cause similar sounds, especially in older cars with aging components. I suggest carefully identifying the source of the noise after starting: if it's a thumping sound, it might be an issue with the driveshaft or half-shaft; if accompanied by vibrations, check the wheel bearings. Don't push through it—safety first. Stop immediately and seek professional repair, and consider a comprehensive chassis inspection to prevent other potential issues. Regular maintenance is crucial to prolonging component lifespan.
