What Causes the Thumping Noise When Coilover Suspension Goes Over Bumpy Roads?

[LeahFitz]

The reasons for abnormal noise in car coilover suspension are: 1. Loose shock absorber mounting: Long-term vibration during driving can cause the fixing nuts to loosen, leading to abnormal noise from the shock absorber. Solution: Tighten the fixing nuts. 2. Insufficient oil in the shock absorber: Lack of oil can also cause abnormal noise. Check for oil leakage in the shock absorber. If there is leakage, it is recommended to directly replace the shock absorber. If there is no leakage, other components of the shock absorber system need to be inspected. 3. Worn rubber bushings: Wear in the rubber bushings at both ends of the shock absorber can create play at the mounting points, causing noise during driving. Replace the rubber bushings. 4. Deformed components: Deformation of the shock absorber piston rod, cylinder tube, or oil reservoir, or sticking of the piston rod can cause abnormal noise and lead to shock absorber failure, even causing safety hazards. Repair is not recommended (as it is very complicated); it is advised to replace the shock absorber.