What causes abnormal noise when stepping on the accelerator?
2 Answers
The reasons for abnormal noise when stepping on the accelerator are as follows: 1. Loose dashboard or console: During operation, the engine needs to intake a large amount of air. If the air is not filtered, suspended dust in the air will be sucked into the cylinder, accelerating the wear of the piston group and cylinder. Larger particles entering between the piston and cylinder can cause severe "cylinder scoring." The air filter, installed in front of the carburetor or intake pipe, filters out dust and sand particles from the air, ensuring sufficient and clean air enters the cylinder. 2. Clutch malfunction: Another method is to pull out the oil dipstick and check if the abnormal noise persists when stepping on the accelerator. If not, it might be a clutch issue. The turbocharger generates compressed airflow noise during operation. When the engine is revving up or the accelerator pedal is pressed deeply, the engine noise becomes louder. To avoid this, press the accelerator gently and avoid flooring it suddenly, as abruptly pressing it all the way down can cause such abnormal noise.
When the car makes abnormal noises while stepping on the accelerator, it could be caused by several common issues. I've tried fixing a similar problem for a friend, and it's usually due to aging or loose engine belts, which cause squeaking sounds when the accelerator is pressed and the load increases. Another possibility is a clogged air filter, where insufficient air intake leads to louder airflow noise; or worn-out driveshaft bearings, which produce metallic clanking sounds during turns or acceleration. If these issues are not addressed, they may damage the engine or transmission system, increasing repair costs. It's recommended to first record the sound with a phone to help the mechanic diagnose the problem, then visit a professional repair shop for inspection. Regularly replace belts and air filters, once a year is sufficient. Don’t ignore small abnormal noises—they are often signals of bigger problems.
