What Causes Abnormal Noise When Accelerating?
2 Answers
Abnormal noise when accelerating is caused by poor lubrication in the fuel pump motor, throttle valve, or accelerator pedal bearings. Fuel Pump Motor Noise: When the fuel pump motor experiences internal wear or contains impurities, it may produce abnormal noise upon acceleration. In such cases, the fuel pump needs to be replaced. Throttle Valve Noise: Modern throttle valves are electronically controlled, and their opening and closing are managed by a motor. If the motor gears wear out, improper engagement can lead to abnormal noise. Excessive carbon deposits or sludge in the throttle valve can also cause noise. Cleaning the throttle valve may resolve the issue, but if the motor is damaged, the throttle valve must be disassembled to replace the servo motor.
Having driven for over a decade, I've encountered throttle pedal noises several times. The most common cause is a loose or aged/cracked engine belt, especially producing squeaking sounds during cold starts. Last time when the belt was severely worn, hard acceleration even came with a burnt rubber smell. Another issue is exhaust pipe gasket leaks that create puffing sounds like flatulence, particularly prone to damage when low-clearance vehicles go over speed bumps. An easily overlooked problem is aged air filter box seals that generate whooshing airflow noises during intake. My advice? Don't hesitate - immediately lift the chassis to check for black carbon deposits at exhaust connections and inspect engine belts for fine cracks.
