Why Car Sounds Like A Helicopter When Accelerating – 17 Reasons

Engine noise is not something out of the ordinary. But higher noise levels than usual may imply serious technical issues.

And once its roaring turns extremely violent – to the point that you even mistake the sounds for an actual helicopter – then you can no longer shrug dismissively and say, “Nah, it’s no big deal!”

But when your car sounds like a helicopter when accelerating, what issues are at play here?

What prompts the automobile to generate such disturbing noises? Our guidelines will explore all possible causes for such a headache.

Why Car Sounds Like A Helicopter When Accelerating?

Why Car Sounds Like A Helicopter When Accelerating

Why does my car sound like a helicopter?

Twisted brake caliper, torn brake rotor, inoperative parking brake, bad brakes, defective wheel bearing, broken fan clutch motors/poor-quality tires, exhaust leak, vacuum leak, faulty catalytic converter, problems with engines, exhaust systems, flywheel, and water pump are just a few to name.

There are a lot of other possibilities when it comes to car making helicopter noise. Our next section will explore in detail why car engines sound like helicopters.

1. Twisted Brake Caliper

Once the brake caliper has been deformed, its rotor would have no choice but to grate incessantly against the disc’s inner surface.

These constant grindings result in crunching helicopter-like sound –  and might even cause the wheels to seize up during brake usage.

These symptoms are pretty obvious to most drivers, as the brakes’ efficacy often experiences a dramatic and noticeable drop.

2. Torn Brake Rotor

Similarly, tears and cracks push the brake rotors to scrape against the disc’s interior compartments. These instances stem from the huge space between it and the caliper as the pad breaks out.

As a result, the brake pads come in close contact with the rotor’s external rears, causing your vehicle to vibrate upon brake operation. In more severe cases, it might even come to a halt.

3. Inoperative Parking Brake

Determining whether the brakes malfunction or not is quite a challenge. Still, one tell-tale signal is in the air brakes, which stay engaged even while your regular brakes do not.

Worse, sometimes the brakes even engage and disengage by themselves, which calls for professional examination from experts.

4. Bad Brakes

Poor brake conditions are signified by noticeable creases on the surface, filled with crude and rust.

Those defects keep the brakes from effective rotor grips, giving the impression that all the sounds are emanating from its engine compartments. No wonder your car sounds like a helicopter!

5. Defective Wheel Bearing 

Failed wheel bearings produce a yelling sound easily heard from within, which explains why your car engine sounds like helicopter when accelerating.

One tire edge enjoys more resistance while the other continues to spin freely. Pay close attention to them on your next drive and identify which part of your vehicle produces helicopter noises.

6. Broken Fan Clutch Motors and Poor-Quality Tires

Defective fan blades will produce sounds like helicopters whenever you turn your car on or off, making the car accelerate or decelerate on its whim.

In the same vein, bad tires generate loud humming noises at faster speeds and only fade away once you slow down.

Such occurrences indicate a lack of proper gripping force, which might put you in danger if not fixed right away.

7. Exhaust Leak

Exhaust leak is also a possible reason. Why so? 

That’s because the exhaust has a separate exit other than tailpipes. But unexpected leakage might cause the black smoke to flow out of the tailpipes instead, meaning all the combustible fuel is discharged here.

All these clogging exhaust pipes generate more helicopter noise from front of car.

8. Vacuum Leak

Clicking sounds also originate from vacuum leaks, though these sounds tend to occur upon acceleration only. Other activities (such as cornering or slowing down) will not suffer from any impacts.

Still, we suggest you not leave this issue untreated for too long. Otherwise, the gasoline shortage from your engine might eventually render the car inoperable.

9. Faulty Catalytic Converter

One feasible factor behind helicopter noises is the failure to convert carbon monoxide into carbon dioxide (CO-CO2), implying a damaged catalytic converter.

How can you identify this issue? The answer is pretty simple: you may see water or oil pooling beneath the car after parking.

10. Engine Problems

The engine might have been malfunctioning if the RPMs undergo huge decreases whenever you push the gas pedal.

We assume insufficient engine fuel is to blame here, causing the vehicle to drive poorly (or even not at all). That explains why your car sounds like helicopter when driving.

Have a professional address the problem immediately or fix it yourself before it is too late.

11. Bad Exhaust Systems

Car accelerations generate tons of airplane noise from the tailpipes, which might allude to a seriously glitching exhaust system.

In such cases, black smoke emits at an alarming speed, probably due to unburned gasoline coursing through the system.

Aside from the smokes and weird noises, you might also take in the intense, unpleasant gasoline odors that permeate the automobile.

12. Poor Motor Mountings

Motor mounts are a crucial automobile compartment that binds your motor firmly in place. Unfortunately, over a short period of time, road frictions cause them to wear out.

Loud banging sounds are some clear signals for these issues, which persist (or worsen) even at lower speeds. Fractures in the rotor mounts are also a transparent indicator.

13. Bad Flywheel

Bad flywheels share quite similar symptoms to exhaust leaks, since both are caused by unburned gasoline discharge into the exhaust pipes.

Thus, it is understandable that black smoke, annoying smells, and helicopter noise in car are also present here. Even during deceleration, they refuse to go away.

14. Transmission Failure

A faulty gearbox transmits more engine power than necessary to the steering wheel, exceeding their preset limits.

The motor amplifies these crackings even further, resulting in helicopter sounds and lagging turbines.

Damaged CV joints are also another possible culprit. Their driveshaft slides off-center, blocking the path between the power source and your wheels.

As a result, the whole transmission process is severely impacted.

Nevertheless, this dilemma is not always easy to notice. Some drivers spot it right away when driving, while others need advice and inspection from experts.

15. Bad Water Pump

Heavy uproars from your vehicle’s engine might be put down to faulty water pumps, which break down due to insufficient coolant circulation.

The indicators might not arrive immediately, so it is hard to detect them at first glance. But over time, you may notice the car’s tendency to boil over or heat up after one or two hours of driving.

16. Ignition Coil Flaws

Remember to always inspect whether the ignition coil is supplied with sufficient power. Or else, the engine will fail to properly function, generating ear-piercing clatter whenever you press your foot on the gas pedals.

No on-time solution only worsens the coil’s conditions. It will shudder every few minutes and even refuse to start in cold weather.

17. Motor Bearing Defects

Motor bearings ensure the car spins are all within control. Substandard ones, on the other hand, cause extra friction on the motor and lead to excessive turbulence.

Also, keep in mind that numerous accidents have occurred to drivers who fail to replace motor bearings on time, since these busted vehicle parts equate to a much higher tendency to slip on the road.

How to Fix Helicopter Sounds?

Below are three methods to fix the bothersome helicopter sounds for your automobiles.

  • Method 1: Renew transmission fluids
  • Method 2: Change to new wheel bearings
  • Method 3: Replace the CV axle

We will break each one into detailed, smaller steps. Do not skip any! 

1. Renew Transmission Fluids

Replacing the transmission fluid will be your best bet here. You might either do everything yourself or count on expert support from a service center.

The whole endeavor might take quite some time if you choose the former, though, so brace yourself for all the hassles to come.

Most vehicles often include a manual with detailed directions for tasks like these. But if yours do not, here are the steps:

Step 1. Unbolt the pan and jack up your car. As the ATF drains out, remember to put a tarp and a pan beneath it.

Step 2. Remove and replace the filter.

Step 3. Get rid of the old gearbox pan gasket to install a new one. Then bolt the pan and fill it with ATF.

Step 4. Start the automobile and keep an eye on potential leaks.

Step 5. Clean up the mess with kitten litter.

2. Change to New Wheel Bearings

Step 1. Park on a level surface to avoid the worst possible outcomes (such as the car rolling away).

Step 2. There are some bearings you are not going to replace. Pick some wheel chocks to secure them in place, giving the car increased stability.

Step 3. Undo the nuts before using a jack to lift this wheel. This move gives you appropriate access to the structural parts of the faulty bearing.

Step 4. Remove the races, which often call for high-performance tools such as mallet, chisel, and grinder. Of course, you should have substitute races prepared at hand. Remember to clean the load frame from the inside out when you finish.

Step 5. Put in new races and wheel bearings with a few hammer hits. Ensure they are aligned and shoved in as far as possible. Also, check whether the sealant rings lie flat against the assembly’s exterior; if they haven’t yet, fix that immediately.

3. Replace The CV Axle

Step 1. Extract The Axle Cotter Pin

Cotter pins keep the outer rim secure on the CV joint. Remove them from the snout using a side cutter (or dikes).

Several automobile models also include a star wheel, which you should remove, too.

Step 2. Take Off The Axle Nut

Three approaches are possible. The first one is to pick an impact wrench – the simplest tool among the three.

Another method requires you to seize the brakes while unscrewing the bar, which prevents needless axle spinning.

How about the last solution? Keep the wheel running while slowly lifting the automobile off the ground with a floor jack.

Loosen the nut when you finish (remember that you will need to reverse this step in the end, once the whole task is completed).

Step 3. Detach The Ball Joint

Disengage the low control arm to pull the strut and remove axle joints from their bearing hubs. Do not forget to extract the low ball joint, too, to make room for these removals.

Certain ball joints also feature a self-locking cotter. Remove that (if any) using a pair of dikes.

Step 4. Install A Replacement CV Axle

With the replacement axle firmly held, let’s reinsert it carefully into the gearbox to avoid destroying the transmission seals. Force it forward to ensure a proper fit.

It might take some time (and a little bit of jiggling) to shove it into the gearbox entirely, so try to be more patient.

This step requires lots of caution; otherwise, improper mounting will dislodge the axle while you are driving, bringing the poor vehicle to a halt.

Step 5. Reinstall the Axle Nut

First, use your bare hands (instead of any instrument) to reinstall the axle nut. This method might be a bit time-consuming, but it will keep cross-threading risks at bay.

Next, screw it back in compliance with the manufacturer’s torque specifications (usually from 121 to 141 foot-pounds). Finally, tighten the wheel before gradually lowering the vehicle back to the ground.

When driving for the first time, pay attention to any usual sounds. If helicopter noises are still clicking, maybe it’s time to recheck all the work you have done or bring the car to a repair shop.


Twisted Brake Caliper

Our article has explained why a car sounds like a helicopter when accelerating and delivers several promising solutions.

Most issues can be handled at home pretty well, but you should turn to professional help if your mechanic skills and expertise are below average.

Otherwise, these dilemmas might get worse.

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