Updated at: 04-04-2022 - By: micdot

When you accelerate, does your vehicle make a rattling noise that bothers you? See if you can figure out what’s wrong and how to fix it. This author has been carefully screened to ensure that he or she is qualified to write on the subject at hand. On our website, you can find out more.

Is that what you heard?

A rattle could be heard.

If your car starts making rattling noises, it is highly unlikely that a snake is the source of the noises.In what way does the rattling sound of the car’s acceleration originate? The following are the most likely culprits:

Heat Shield Defect

Engine Mounts that have been messed up

There are problems with the valve train.

There Are Transmission Issues

Engine Components that have been overworked

Fortunately, we’ll go through each of these factors in depth in this article. In addition, we’ll talk about how to remedy problems.

Let’s get this party started!

List of Chapters

Does Your Car Rattle When Accelerating? 5 Possible Causes And How To Fix Them

Does Your Car Make A Rattling Noise When Accelerating? [Fix]

Cause #1 – Broken Heat Shield

Heat shields protect your car from the exhaust system’s heat by enclosing certain parts with metal.Due of their proximity to the ground, heat shields are prone to breaking. Exhaust piping, muffler, and exhaust manifold are all common locations. This exposes them not just to debris but also to moisture, increasing the likelihood of corrosion problems.

Yes, when the damage is bad enough, your car may begin to rattle when you apply the gas.They do so because the engine is under additional stress while accelerating. The exhaust is where the majority of your car’s heat shields are located, and the harder it works, the more air is pushed past it.

How To Fix

The good news is that heat shields can be repaired quickly and cheaply if they haven’t been severely damaged. You should expect to pay between $250 and $300 to replace it. Otherwise, a local business should be able to fix it with spot welding.

Cause #2 – Damaged Engine Mounts

As a reminder, the average car engine weighs roughly 300 lbs., and the engine mounts are responsible for keeping it in place. They are comprised of rubber and metal, which means that if they are broken, there’s nothing to stop it from moving around.Metal-on-metal contact can result in a rattling noise as your automobile accelerates because of the additional stress (as well as momentum). More than simply a rattle will likely occur if the situation is left unattended. Exhaust system malfunction, decreased handling and/or drivetrain failure are all possibilities.

How To Fix

Broken or damaged engine mounts aren’t difficult to fix, therefore that’s a positive. A licensed mechanic may be more convenient than a do-it-yourself inspection of your vehicle’s undercarriage. Replacement of the worn or broken mount should cost between $200 and $500.

Cause #3 – Valve Train Issues

Diagnosing Valve Train Noise and Other Symptoms of a Bad Valve Train -  AxleAddict

A valve train problem is most likely the cause of a rattling noise that sounds like glass bottles clinking together.The intake and exhaust valves are controlled by this mechanism. Premature ignition can occur if any of these components are stuck or worn, including the hydraulic lifters.

Carbon rap is a common term for this, and it’s usually caused by unclean oil or a lack of gas in the tank.

How To Fix

If the problem is with the valve train (placed on the engine’s top), the first thing you should do is check the oil. An oil change may be all that’s required if it’s unclean. In your owner’s manual, you’ll see if your engine demands a higher octane fuel. Engine performance will suffer if you put in 89 instead of 95, and it may make a rattling sound.

Cause #4 – Transmission Problems

As with most engine components, if the transmission isn’t getting adequate lubrication, it won’t function properly. In order to keep moving parts from rubbing against each other, transmission fluid acts as a barrier between them. Will cause your automobile to rattle if you don’t have enough of it. The expense of ignoring a transmission that’s low on fluid will gradually increase. You’ll have to rebuild or replace the transmission if the gears wear out due to metal grinding against metal.

How To Fix

Fortunately, if you change your transmission fluid on a regular basis (every 30,000-60,000 miles), you shouldn’t have any problems. You should always check the fluid levels first, even if it’s your tranny. Adding additional will be necessary if the level is low. To learn more about tranny fluid and how much it costs to change it, see our previous post.

Cause #5 – Worn Exhaust Components


There are a number of exhaust system components that can cause your automobile to rattle when you accelerate.There are a few of these:

Pipe connector that has come unfastened or broken

Muffler with rust.

A ruptured exhaust gasket has occurred.

Hangers that have been broken or detached from the exhaust system

Failure of the catalytic converter

Exhaust system malfunction

You could end up damaging your entire system if you ignore them. In addition, they have the potential to reduce both performance and fuel efficiency.

How To Fix

The first step is to identify the problem area in the system. You may inspect the underside of your car for damage, but if you’ve just driven, you’ll need to let it cool down first. It’s also possible to “shake” the system with your hands and listen for any rattling sounds.

If you’re not sure you can handle this repair yourself, you should probably take your vehicle to a professional mechanic. They can also run a pressure test to see whether there is a leak even if no visual concerns are found.

Don’t Lose The Rattle Battle – Instead, Get Rid Of It

Eventually, a rattling noise from a car’s acceleration will become more than a minor inconvenience. Car rattling is caused by a lack of maintenance, as you can see from the list of factors above. As a result, you should always take good care of your vehicle and address any rattling issues as soon as they arise.