What Causes Abnormal Noise When Accelerating a Car?

[HectorMarie]

Reasons for abnormal noise when accelerating a car: 1. Fuel pump motor noise: When internal wear or impurities exist in the fuel pump motor, abnormal noise occurs upon acceleration. This issue requires fuel pump replacement. 2. Throttle body noise: Modern throttle bodies use electronic control, with motors naturally controlling valve opening/closing. Gear wear in the motor causes insufficient engagement and noise. Excessive carbon deposits or sludge in the throttle body can also cause noise. Cleaning the throttle body may help, but motor damage requires throttle body disassembly and servo motor replacement. 3. Poor lubrication in accelerator pedal bearings: Apply grease to the bearings for lubrication. 4. Clutch release bearing damage causing incomplete clutch disc separation: Remove the clutch and replace the release bearing.

[MacAthena]

My car has also experienced abnormal noises when accelerating before. After summarizing, there might be several possible reasons: The belt system is the most common culprit; an old car's belt may become loose or cracked, causing a squeaking sound during acceleration. Aging or leaking gaskets in the exhaust system can produce a puffing sound during hard acceleration. A cracked intake pipe can cause a hissing sound, which is especially noticeable in turbocharged cars. The most concerning sound is knocking—a rattling noise—which is often due to bad spark plugs or excessive carbon buildup. When fixing my car, I like to first note when the noise occurs: Does it happen during a cold start or after the engine warms up? At what specific RPM? This helps the mechanic diagnose the issue more quickly when I take it in for repairs. I remember that time when my car had a belt noise; I temporarily sprayed belt conditioner to get by for half a month, but in the end, I had to replace the entire set to fix the problem.

[JamesDella]

Identifying abnormal noises during vehicle acceleration requires location-specific diagnosis. Common issues in the engine compartment include: damaged tensioner pulley bearings producing sharp whistling sounds, or alternator/water pump bearing failures causing increasing humming noises with RPM - these are frequent cases I handle. For exhaust systems, aging gaskets or perforated pipes create obvious puffing leakage sounds. Regarding chassis noises, worn CV joints produce clicking during turning acceleration, while differential or transmission internal wear generates dull grinding noises. I recommend first checking engine oil and transmission fluid levels - once a client's transmission noise was simply due to low fluid.

[DiJessica]

I've encountered throttle noise issues twice: the first time was a hissing sound during acceleration in a turbocharged car, and the inspection revealed a cracked rubber joint in the boost pipe; the second time was a clicking noise from the engine bay, diagnosed as a knocking problem. Common causes include four categories: aging belts, exhaust leaks, bearing wear, and intake pipe leaks. I remember the mechanic reminded me during the last service not to cheap out on low-grade fuel, as poor combustion can easily lead to knocking sounds. Additionally, you can perform a simple check yourself: rev the engine while stationary to see if the noise repeats, and pay attention to the dashboard warning lights.