What causes the abnormal noise when starting on a slope?

[CharlesMarie]

Possible causes of abnormal noise when starting a car on a slope are as follows: 1. Clutch noise. 2. Transmission shaft support bearing noise. 3. Drive axle abnormal noise. 4. Differential noise. 5. Tire noise. 6. Vehicle resonance caused by loosening of a certain part. The abnormal noise during starting and acceleration is most likely due to low-speed engine resonance. Low-speed vibration frequency is low, and when it is close to or the same as the natural frequency of certain components, resonance will occur. If the car has been driven for too long, the original fasteners and rubber washers may age and loosen, which can easily lead to increased vibration.

[BennettRose]

That squeaking or buzzing noise during hill starts can be really annoying. My car used to do that too, and it's usually the clutch causing trouble. For manual transmission cars, if the left foot doesn't fully engage the clutch or the right foot doesn't press the accelerator enough during hill starts, it's easy to get that grinding noise from the clutch disc slipping. For automatics, the hill-start assist system's brake pads gripping can also produce similar creaking sounds. Also, if the engine and transmission mounts on older cars are cracked or worn, you might hear noticeable clunks or squeaks when applying strong starting torque. Next time, pay attention to whether the sound is most obvious when releasing the brake—it's often caused by slow brake pad retraction or worn suspension bushings creating metal friction; sometimes a bit of lubricant can help. If the noise is particularly harsh and accompanied by vibration, it's best to check the clutch disc thickness or transmission mounts for issues.

[McKai]

Don't panic if you hear strange noises during hill starts—listen carefully to identify the type of sound. Clutch slippage usually produces a sharp metallic scraping noise, like my old manual transmission had; replacing the clutch disc fixed it. If it's a dull clunking sound, it's likely excessive wear in the driveshaft universal joint, especially noticeable during turns. If you hear a loud clang like metal hitting the ground, check the axle bolts immediately. Many modern cars have hill-start assist systems, and brake pad squeaking during holding is common. However, if the noise occurs with every start, especially accompanied by rough power engagement, focus on inspecting the clutch assembly or transmission fluid level. Delaying repairs for these issues will only increase costs—address them early.

[LeLucille]

Creaking noises during hill starts can be quite annoying. From my experience, such issues generally fall into two categories: operational and mechanical. On the operational side, inexperienced clutch pedal modulation in manual transmissions often causes gurgling sounds - the solution is to practice finding the friction point on flat roads. Mechanically, worn components are prime suspects: clutch discs thinning out after five years causing slippage, deteriorated engine mounts leading to excessive vibration, or loose ball joints in steering linkages producing squeaks under load. If the noise disappears on rainy days, it's likely caused by abnormal brake pad-disc friction due to rust buildup. Those who've modified tire sizes should also watch for drivetrain humming from altered CV joint angles. First check if the dust boots are torn - immediate repair is necessary if there's grease leakage.