Why Is My Car Making A Rattling Noise When I Turn It On?

Why Is My Car Making A Rattling Noise When I Turn It On? Rattling noise in your car can lead to more serious problems if ignored. Here’s how to identify and fix the problem.

When your vehicle starts making strange noises, you are naturally alarmed. There are some noises that are very distinctive and easy to diagnose, but it isn’t always the case. The cause and solution of a car’s rattling noise can be much more difficult to determine.

The purpose of this guide is to help you identify the source of the rattling noise. This information will help you determine the possible causes and fixes for your problem, although you may still need a professional diagnosis. 

5 Reasons Why Is My Car Making A Rattling Noise When I Turn It On

5 Reasons Why Is My Car Making A Rattling Noise When I Turn It On

1. Low Engine Oil

When your engine makes a rattling noise, you should suspect low engine oil. Due to poor or no lubrication for vinyl engine components, a low oil level can cause rattling sounds.

The oil keeps engine components lubricated and prevents damage caused by friction, but as the level drops, metal-to-metal contact can increase, causing vibrations that produce the telltale rattling noise.

2. Cracked or Broken Serpentine Belt

There is a serpentine belt on every diesel or gasoline car. There are some who have one, some who have two, and some who have three. Your serpentine belt drives your alternator, water pump, and air conditioner compressor. Serpentine belts are often mistaken for timing belts.

In most cases, the timing belt runs the engine’s camshaft and is hidden under protective covers, while the serpentine belt is visible. In the event that the serpentine belt gets cracked or completely broken, it can make a rattling noise because it will become loose and hit vital engine components.

3. Broken Mounting Bracket

A broken mounting bracket could also be causing a rattling noise. Various accessories like the power steering pump compressor and air pump, as well as the engine, are mounted on mounting brackets. When the mounting bracket is broken or worn, the engine will move freely, creating vibrations and rattling noises.

4. Broken Flexplate

Automatic transmissions use flexplates or flex-shocks to connect the crankshaft to the torque converter and improve smooth operation. The flexplate connects the engine to the transmission in any car with an automatic transmission. It absorbs vibrations, but if it weakens or cracks over time, it can start rattling.

5. Engine Knock or ”Pinging”

5 Reasons Why Is My Car Making A Rattling Noise When I Turn It On

When air and fuel are mixed incorrectly or unbalanced inside a cylinder, the fuel burns unevenly, causing shock waves at the wrong times, resulting in a rattling noise and causing damage to the pistons or cylinder walls.

A rattle can be heard when an uncontrolled explosion occurs in a cylinder. This condition is controlled by knock sensors in most cars. In any case, if the fuel octane levels are too low, the problem will persist. Carbon buildup could be the cause of the problem if the problem persists.

Frequently Asked Questions

Que 1: Why Does My Car Make A Noise When I Start It And Then Goes Away?

Ans: The solution could be as simple as replacing the worn-out belts. Alternatively, the tensioner pulley or idler bearings could be failing. It is a simple fix that is often overlooked. It is important to have a mechanic inspect the noises to avoid spending money on parts you may not need.

Que 2: Should I Worry About My Car Rattling?

Ans: The first step to dealing with a rattling noise while driving is not to ignore it. Sounds and vibrations coming from your vehicle could indicate a serious mechanical problem. Find a professional who can determine the source of the noise before any further damage is done.

Also Read: How To Clean Car Cup Holder? Step By Step Guide


If you hear a rattle when your car is idling, don’t just turn up the audio system and ignore it. It could be an early warning sign that something is seriously wrong with your car. A simple and easy fix might be the cause of the rattle.

Whatever the cause, it is worth finding. When your car makes a rattling noise, it is important to determine the cause as soon as possible to prevent expensive damage. Keep visiting Car Walls.

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I'm David, and I love cars - especially writing about them! I'm the owner of Carwalls.org, where I write car reviews and offer advice on car technical issues. My passion for cars started at a young age, when I would help my dad work on our family's vehicles. These days, I spend most of my time test-driving new models and researching the latest automotive technology. I'm always looking for a new challenge, so be sure to check out my website for the latest in car reviews and news. Thanks for reading!


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