What Causes the Abnormal Noise When Coilover Suspension Goes Over Uneven Roads?
3 Answers
This is a normal phenomenon caused by overly stiff springs. Other abnormal causes are as follows: 1. Interference between components: Due to impacts or the installation of additional equipment, two components may affect each other. Solution: Only reshaping, repairing, or replacing the relevant components can eliminate the interference. 2. Loose bolts or nuts: Long-term driving on poor road conditions can naturally loosen bolts; improper disassembly or installation can damage bolts; insufficient tightening torque or incorrect bolt specifications. Solution: Tighten or replace the bolts and nuts. 3. Driveshaft universal joint failure: Caused by a broken dust cover or oil leakage that was not repaired in time. Solution: Replace the driveshaft universal joint with a new one. When the car is stationary, the ground clearance at the four corners of the body has a significant impact on the load of the wheels at those positions.
As someone who has driven many modified cars, I think there are several common reasons for coilover suspensions making strange noises on uneven roads. The most common is a damaged top mount bearing, which becomes stiff and less flexible with age, causing squeaking sounds when turning over bumps due to friction. It could also be improperly installed springs with unbalanced preload, leading to collisions with the shock absorber. From my experience, these noises aren't just annoying—they can degrade suspension performance, causing unstable steering or even loss of control. I recommend regularly checking for oil leaks on the shock absorbers and tightening any loose bolts yourself. Regular maintenance can extend their lifespan. Don't overlook small issues—getting timely professional diagnosis can save you big on repair costs.
I've been into car modifications for several years, and the abnormal noises from coilover suspensions usually stem from installation details. For example, if the screws aren't tightened properly during modification, or if the spring position is misaligned, it can cause metal friction sounds on bumpy roads. Poor-quality bushings that harden easily can lead to squeaking over time. I've experienced this myself with my car—using aftermarket parts with inferior materials accelerated aging, resulting in a loose suspension that compromised safety. Noises can also be related to insufficient lubrication; dry friction occurs when moving parts lack oil. Regular application of lubricant can prevent this, but it's essential to use genuine parts to avoid trouble. Always be alert to unusual sounds while driving. First, stop and check the tightness of the screws. If the issue is complex, consult a modification specialist to prevent minor problems from escalating.
