What are the reasons for increased noise after a car has been repaired following an accident?
3 Answers
The reason for increased noise after a car has been repaired following an accident is due to engine malfunction. Such vehicles are classified as accident-damaged cars. Below is detailed information about accident-damaged cars: 1. Overview: An accident-damaged car refers to a vehicle that has suffered damage from non-natural wear and tear incidents, leading to a decline in mechanical performance and economic value. Generally, 'accident-damaged cars' are those with structural damage. Additionally, water-damaged cars and fire-damaged cars fall under the category of 'special accident-damaged cars.' 2. Others: Minor rear-end collisions are one of the common incidents during vehicle operation. To check if a car has been involved in a rear-end collision, open the engine hood and inspect the edge seal of the hood for smoothness and softness upon touch. If the seal is uneven or feels soft, it indicates that the hood has been repaired.
I totally feel you! Last time after my car got rear-ended and repaired, it ran like a tractor. A friend at the repair shop said the most common issue is poorly installed chassis parts, like loose underbody shield screws causing a buzzing resonance above 60 mph. Also, if the exhaust hangers are deformed, the whole cabin vibrates at idle. The worst is using aftermarket parts—engine mount bushings bought online deteriorated in three months, making clunking noises over speed bumps. Plus, if the body alignment is off and door seal strips aren’t pressed tight, high-speed wind noise whistles like crazy. My advice: take a mechanic for a test drive, especially on gravel roads to pinpoint problem areas.
Just helped a neighbor with the same issue. Abnormal noises after sheet metal repair often stem from structural deformation, like errors in frame rail alignment that cause creaking over bumps. Incorrect torque on chassis bolts is even more common—some shops overtighten them with impact wrenches, causing ball joints to fail prematurely. Pay special attention to the exhaust system; pipes on collision-damaged cars easily deform, especially when the catalytic converter section rubs against the frame, creating metallic scraping sounds. A lost driveshaft balancing weight can also cause rhythmic noises, particularly noticeable above 50 mph. Don't forget to inspect newly installed sound insulation—low-quality materials emit sour odors when heated.
