What Causes the Jaguar to Make a Thumping Sound Twice When Passing Over Speed Bumps?
2 Answers
Jaguar cars making abnormal noises when passing over speed bumps can be attributed to the following reasons: 1. Aging of the stabilizer bar link ball joint: The rubber at the ball joint can be checked for aging by removing the tire. 2. Excessive gap in the steering tie rod end: This requires professional judgment, but when the vehicle is lifted, you can forcefully shake both sides of the tire with both hands to check for looseness. 3. Broken or leaking drive shaft boot: This leads to increased wear of the drive shaft, and abnormal noises will occur when it is damaged. 4. Damaged or loose chassis components: This can also cause abnormal noises when driving on uneven roads, and it is generally necessary to check some steering mechanism screws and shock absorber rubbers.
After driving for so many years, my Jaguar occasionally makes this kind of noise. The two thumping sounds when going over speed bumps are usually due to issues with the suspension components. Aging shock absorbers are a common cause; over time, their elasticity decreases, reducing their damping effect, leading to metal collisions when the body bounces. It could also be worn-out bushings on the stabilizer bar—hardened rubber loses its cushioning ability, causing noise when going over bumps. Incorrect tire pressure is another issue; too low and the tires feel soft, too high and they feel stiff, both of which can lead to thumping sounds. Once, I ignored the noise for a long time, which ended up accelerating damage to other chassis components, increasing repair costs several times over. I recommend first checking if the tire pressure is within the standard range, then taking the car to a professional shop to inspect the chassis. Loose suspension or oil leaks should be repaired promptly. Safety comes first—never ignore any unusual noises when driving at high speeds.
