What Causes the Abnormal Noise When Accelerating a Car?

[MacVera]

Reasons for abnormal noise when accelerating a car: 1. Excessive clearance or damage in internal engine components such as pistons, valves, gears, and camshaft bearings; 2. Loose or insecure connections in areas like door panels, glove compartments, air vents, and center console panels causing friction; 3. Rusty brake discs or noise caused by trapped sand and debris; 4. Loose shock absorbers or connecting components in the suspension system. Engine maintenance methods include: 1. Regularly changing engine oil and oil filters; 2. Periodically using high-efficiency rapid cleaning agents for the lubrication system to clean the crankcase and maintain internal engine cleanliness; 3. Regular maintenance of the PCV system, removing contaminants around the PCV valve to ensure proper crankcase ventilation.

[MaxDella]

Last time I filled up my car, I suddenly heard a buzzing sound from the fuel tank area, like a beehive, which really startled me. It's most likely due to an aging fuel pump—this component sits inside the tank and pumps fuel, and over time, its impeller can wear out. Another possibility is an air leak in the fuel line, causing the pump to draw air and make strange noises. Remember to check the rubber seal on the fuel filler cap; if it's aged and leaking, it can alter the tank's pressure. If the noise happens every time you refuel, you should head to the repair shop ASAP—otherwise, you might end up stranded when the pump fails. That happened to me once, and replacing the pump cost me nearly two thousand yuan.

[JustinDella]

Speaking of abnormal noises during acceleration, my car once experienced a buzzing vibration from the chassis. The mechanic said it was most likely due to a cracked exhaust pipe, where high-temperature exhaust gases escaping caused a whistling sound, especially noticeable during acceleration when the engine load increases. A stuck pressure relief valve inside the fuel tank can also produce a hissing sound, similar to a slow tire leak. You can pop the hood to listen for bearing noises from the pulley, but avoid touching components near the fuel tank. It's advisable to note the type of noise: sharp sounds may indicate sealing issues, while dull vibrations often point to exhaust pipe weld failures. Don't ignore it like I did—the crack expanded, costing me over 800 bucks to fix.

[KendraRose]

The most common cause of abnormal noise near the fuel tank is a fuel pump issue, especially in vehicles with over 80,000 kilometers. Worn fuel pump blades can produce a whining sound like a broken fan, which becomes more noticeable under increased load during acceleration. Additionally, a leaking exhaust pipe gasket due to aging can create a hissing noise. I once mistook it for something scraping under the car, but upon lifting the trunk liner, I found that rodents had chewed through the fuel pump wiring harness, causing a short circuit that led to abnormal solenoid valve noise. A simple fix is to replace and secure the wiring harness with new zip ties. For safety, always turn off the engine and check for gasoline odors whenever abnormal noises are heard.