This is due to the pressure from the drive belt, causing the bearings to grind together. It''s also audible on the passenger side, but not as much. In another circumstance, when your automobile is running at low speed the noise keeping coming out of car engine. Your car makes a humming noise when accelerating. Car Grinding Noise Under the Hood. The left (driver''s side) of my car is making a rattling noise, which speeds up when I speed up and slows down when I slow down, etc. The rattling noise appears when you start speeding up from 0 to maybe 30 or 40 mph and then disappear after car speed surpasses 40 mph. There is nothing hanging below the car, and the tyres are fully inflated. Categories Engine Mechanical. It only occurs at low speeds, 10-15mph, but not at speeds higher than that. Here’s a look at car rattling noises from both inside and outside of your vehicle and what they might represent. Fortunately, most car noise can be easily identified, and you can often resolve the problem on your own. A quiet car makes for a happy driver, but once a rattle or some other odd noise emerges, your peace of mind may evaporate. Your brakes are make a metallic scraping noise: If you hear this can mean the lining of your brakes or your brake pads are worn, and need to be replaced. So what’s about car makes noise when accelerating at low speed on the road? Alternatively, this sound could also indicate worn-out shock absorbers. 9. While driving, you hear a low-pitched hum. But when your engine is idling, you may hear a scraping noise from the front of your car. A “rattle“ sound on light bumps (cracks in road): This is consistent with anti roll bar drop links that are worn out or that have snapped. The thudding noise is usually paired with a bumpier ride, so you might also notice that your car isn’t driving as smooth as it used to. A loud scraping and grinding noise coming from the front right of the car. In more extreme cases, your timing could be off causing rough idle, check engine lights, or limp mode. However, that does not mean that there is no problem. If the rattle is underneath your car, that could mean a loose exhaust system component or a broken catalytic converter, which would both require a mechanic’s attention. If this part goes bad, you may experience rattling or chain noise, especially on startup. When the water pump’s bearings are failing, it will make a loud rattling sound. The car drives normally at normal speeds, but it sounds shocking at low speeds. Never put off brake repair. You might not notice your car making noise when driving. You should also notice problems with your car’s temperature, as a lack of pressure from the pump will cause your vehicle to overheat.. Rattles coming from inside the car If something under the bonnet is rattling, it could be anything from problems with oil level to a bad fan clutch, so if the noise persists check the car into a garage. The rotating parts all attached to the front of your engine have bearings to allow them to move smoothly. 3. Sounds like a chain dragging, but nothing is hanging from the bottom of my car. Notably, this sound often goes away when a vehicle reaches higher speeds. When you make a turn, the noise gets louder; but if you turn the other way, it disappears. Try opening the windows and listen to the sounds your car makes as you idle, turn corners, accelerate, brake, turn on and off different equipment like the air conditioning or headlights. As you accelerate, the noise gets louder—maybe it sounds like an airplane taking off—but after a certain speed the volume is consistent. Passenger side, but nothing is hanging from the front of your vehicle and what might... 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