What Causes Abnormal Noises in a Sedan's Chassis?
2 Answers
There are many reasons for abnormal noises in a sedan's chassis: noises caused by looseness or deformation of chassis components, noise from tire tread patterns, noises from internal parts of the chassis such as the engine or transmission, noises from various transmission devices like the front axle, rear axle (depending on the drive structure), connecting parts, etc., and noises from the front or rear wheel bearings. When abnormal noises occur in the sedan's chassis, it is recommended to send the vehicle directly to an authorized service center for inspection and repair. This ensures the use of genuine parts and maintains warranty coverage. For out-of-warranty vehicles, it is still advisable to visit an authorized service center to ensure safety. The chassis refers to the combination of the transmission system, running gear, steering system, and braking system in a vehicle. It supports and mounts the engine and other components, forming the vehicle's overall structure, bearing the engine's power, and ensuring normal operation.
With over a decade of car ownership experience, the most common chassis noise is a 'creaking' sound when going over speed bumps or potholes. This is often caused by aging and cracking of the lower control arm bushings - just like dried rubber that hardens and loses its cushioning effect. When the stabilizer bar bushings wear out, you'll hear a 'thudding' noise during turns, especially noticeable on rainy days. Last time my car made a 'squeaking' sound during low-speed braking, and inspection revealed stuck brake caliper guide pins - failing to fix this promptly can lead to uneven wear. If you hear a metallic 'clanging' noise, immediately check if the subframe bolts are loose, as this can even cause steering wheel vibration. I recommend having mechanics use a pry bar to check chassis components during each maintenance - any play can help detect issues early.
