What Causes Abnormal Noises When Decelerating and Lifting Off the Throttle?
3 Answers
Abnormal noises when decelerating and lifting off the throttle may be caused by internal car issues or engine oil problems. Internal car issues: When the engine is idling, press the throttle to see if the noise frequency changes. If the frequency remains unchanged, it is likely the sound of the solenoid valve. If the frequency changes, the noise should be coming from the valve area. If the noise is not clearly audible inside the car, it is not a major issue. Vehicles normally produce corresponding ticking sounds, which can be from the fuel injectors working or the valve area. Engine oil problems: If the car makes a ticking noise when accelerating, it could also be due to engine oil issues. This might be because the oil hasn't been changed for too long, the oil quality or grade doesn't meet standards, or there could be an oil leak leading to insufficient oil.
When I was driving, the car made a clunking noise when I slowed down and let off the gas, which was really annoying. After checking, it's most likely a problem with the suspension system, such as wear on the upper mount bearing of the shock absorber or unstable spring support, causing the body to shake and make noise. It could also be a loose connection in the exhaust pipe, where increased vibration during deceleration causes a thud. I initially thought it was a minor issue and ignored it, but after repairing it, I realized the suspension was loose, costing me several hundred dollars. I recommend testing it yourself at low speed first—find a flat road and slowly decelerate to listen for the location of the noise. Don't delay until it becomes a major issue affecting safety. During regular maintenance, these components can be checked to ensure proper lubrication, especially for older cars, which are more prone to such problems.
When decelerating and lifting off the throttle, there's an abnormal noise. As a car enthusiast, my first thought is worn suspension components, such as a cracked control arm bushing—the load change when lifting off the throttle can make it squeak. It could also be a loose exhaust pipe hanger, producing a rattling sound that's more noticeable at low speeds. Worn or failed drive shaft universal joints can cause a clicking noise. Try opening the engine bay yourself and check for any loose parts by giving them a shake. The type of noise is crucial: metallic scraping often points to the suspension, while a low vibrating sound might indicate the exhaust pipe. Don’t rush to replace parts—first pinpoint the source to avoid unnecessary spending. Adding lubricant during maintenance to prevent rust can also help. Remember, safety first: ensure the issue is resolved before driving at high speeds.
