What Causes the Nissan Sylphy to Make Strange Noises When Driving on Bumpy Roads?

[MaliaDella]

Nissan Sylphy may produce strange noises when driving on bumpy roads due to issues in the dashboard, chassis, or doors. Here are the specific details: Dashboard Noises: These can be caused by misalignment or improper installation of plastic molds in the dashboard, leading to friction and loosening when driving over bumps. To resolve this, locate the source of the noise, identify the friction point, and place a rubber pad to block the friction. Chassis Noises: These may result from loose buffer springs in the mid-section of the exhaust pipe, which can be difficult to fix. Other causes include loose chassis screws, such as those in the front engine underbody guard, or loose parts in the engine compartment. Additionally, if the shock absorber rubber has aged and lost its damping effect, it can also produce noises. Door Noises in the Sylphy: These are mainly caused by loose parts or fasteners, rusted internal components creating friction during operation, or mechanical noise from the door cable. If the noise is due to friction between parts, applying a lubricant may help. If the issue is loose or fallen parts or fasteners, the door panel may need to be removed for inspection and reinforcement to eliminate the noise.

[Emerson]

My Sylphy has been driven over many bumpy roads, and the abnormal noises are often suspension system issues. For example, worn-out shock absorbers leaking oil make a thumping sound when going over bumps; or worn lower control arm ball joints creak, especially since the Sylphy's chassis is relatively soft, making it more prone to damage when driving long distances on rough roads. I personally experienced loose suspension link bolts, causing a clanking noise when driving over speed bumps and making the steering wheel unstable. It's recommended to first inspect the front and rear suspension components for any rust or cracks. If the abnormal noise is accompanied by body swaying, it might be due to fatigued and deformed springs. Don’t ignore this issue—excessive noise during bumps can distract you, and high-speed turns might even lead to loss of control. Safety comes first, so have a professional mechanic inspect the suspension as soon as possible. Try to avoid gravel roads and sudden braking in daily driving to prolong the lifespan of the components.

[Brooklyn]

I've been repairing cars for over a decade. The common cause of abnormal noises in the Sylphy when driving on bumpy roads is brake system issues. For example, loose calipers or rusted guide pins can cause a clicking sound when going over potholes, becoming more noticeable during vibrations. Or unevenly worn brake pads grinding against the discs can produce a squeaking sound. I've inspected the front brakes of Sylphy models for customers, and in some cases, the rubber boots on the guide pins had aged, trapping dust and causing persistent noise. I recommend owners test drive by lightly applying the brakes over bumps. If the noise diminishes or changes pitch, it's likely a brake issue. The Sylphy's brake design is simple, so regular maintenance is crucial—cleaning dust and applying lubricant. Don't wait until the calipers seize, as this poses a significant risk of brake failure. Drive to a shop to inspect the brake components and the fixing points of the brake lines. It usually costs around 100-200 yuan to fix.

[StBriella]

My Nissan Sylphy has been driven for three years, and it always makes strange noises when going over bumps. After inspection, it was found to be due to loose body components. For example, the trunk cargo board wasn't secured properly, causing jumping sounds when hitting bumps; or the door plastic trim panels were loose, creating squeaky friction noises. Later, it was discovered that the door hinges were rusted, making creaking sounds on rough roads, but spraying some rust remover quieted them down a bit. Another time, the exhaust pipe hanger was aged and loose, causing clanking noises, which was fixed by simply tightening it. It's recommended to empty the car of all clutter and take a test drive—if the noises disappear, it's likely an interior trim issue; otherwise, check all bolt fastening points. The Sylphy has many plastic parts that age quickly, so avoid unnecessary modifications that could increase risks.