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HomeTop NewsPossible Causes of Noise Under The Hood And Ways to Eliminate Them

Possible Causes of Noise Under The Hood And Ways to Eliminate Them

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The appearance of strange noises in the engine compartment of a car is a serious cause for concern. Even experienced drivers often do not know how to act in such a situation, and novice drivers generally start to panic. If you want to know more about the causes of noise under the hood, then this article is for you. In any case, you can sell your old or broken car as we buy junk cars in Birmingham, AL, or any other city in the USA.

Noise May Vary

There are several types of noise that car owners face. Let’s look at them, as well as solutions for them, in more detail.


Drivers encounter hissing sounds very often. This indicates the leakage of antifreeze, followed by contact with the heated parts of the vehicle. In contact with hot surfaces, the technical fluid begins to evaporate.

The problem can also be detected on a turned-off engine after a stop since breakdowns appear on the nozzles, which expand under the influence of heat. When the engine stops running, the coolant cannot circulate through the system, and the leak only increases through the expanded areas. The more intense the antifreeze flows out, the stronger the hissing sound.

If you encounter such signs, you need to open the hood and try to find the leak. After that, the malfunction should be eliminated and the supply of coolant should be restored in accordance with the regulations.

Crunch And Creak

If you find crackling sounds in the engine compartment, you should immediately check the gearbox (in most cases, such signs indicate wear on gears or clutch elements). Comprehensive diagnostics and proper vehicle maintenance reduce the risk of such problems. If a crunch appears in the car, do not delay contacting the auto repair shop.

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In the early stages of malfunctions, periodic squealing appears in the engine area, but if you do not respond to the symptom, the squealing will intensify in the near future. In most cases, unpleasant sounds are detected at high speeds. Wear of the servo belt tensioner rollers leads to their occurrence.

If you have had to change alternator belts and tensioners, you can try to solve the problem yourself. In the absence of experience and opportunities for repair, it is better to contact a car repair shop.


This phenomenon is more often observed in rear-wheel drive vehicles due to excessive wear of the differential. According to auto experts, many car owners are aware of such troubles, but often ignore them. As a result, this leads to more serious malfunctions.


When operating a vehicle in rough terrain and on roads with potholes, pits, and other irregularities, the problem of clattering under the hood appears quite often. In this case, this is not always a defect, but a natural reaction of suspension elements and other car parts to overcome obstacles. If the problem is observed on a flat road and does not stop, contact a service station for help.

There are various causes of such breakdowns, but usually, they are caused by wear on the tie rod ends, anti-roll bars, shock absorbers, or ball joints.


Growling noises indicate malfunctions in the power steering pump. Leading automakers refuse such mechanisms, so they are not so common on new models. If your car has power steering, you will need to check it for breakdowns.


The owners of front-wheel drive cars face crackling. Such sounds are heard better at low speeds when cornering. If you find a crackling sound when you try to turn the steering wheel, you may need to replace the CV joints. These components are responsible for the transfer of traction between the wheel axles.

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Whistling And Popping Under The Hood

These are extremely dangerous symptoms, you need to immediately turn off the engine and call a tow truck. Most likely, we are talking about improper combustion of the fuel-air mixture due to serious malfunctions in the internal combustion engine. Under the influence of high pressure, the engine is destroyed, so hurry to contact the service center.

If you encounter whistles and pops in the field, try draining all the fuel and changing it. Recheck. If the sounds are gone, the motor will most likely run normally. If there are no positive changes, you will have to turn to other people or services for help. The operation of a car with such problems is prohibited. Do not be upset, as you can sell the car profitably anyway. We at JunkCarsUs buy junk cars in Birmingham, AL, and other US cities.

Rattles And Knocks

Rattling sounds appear for two reasons: due to significant wear or damage to individual engine components (pistons, bearings, etc.). Faced with knocks and rattling, you need to turn off the engine and find the cause.

Very often, rattling occurs against the background of a low oil level in the engine. If it is below normal, you need to top up the oil. After the level is restored, the motor should be checked. If there is no problem, you can continue driving with occasional stops to check the oil level. If it is quickly consumed, then there is a leak somewhere, and you need to go to the service to fix it.

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Causes of Strange Noises

If you are faced with third-party sounds in the engine compartment of the car, you need to find the cause and proceed to eliminate it:

1. Noise from actuator valves.

Hydraulic lifters are responsible for adjusting the movement of the intake and exhaust valves. As car owners note, the third-party sound decreases with increasing engine speed. The main cause of noise in this part is the wear of the hydraulic compensator or related problems due to soot in the engine compartment. Sometimes low oil pressure leads to this, which is also extremely unpleasant.

2. Timing chain noise. 

In new models of vehicles, the timing chain is much longer than in older ones. The main purpose of this component is to organize the synchronous opening of the valves and the normal operation of the crankshaft and camshaft. Inside the timing are hydraulic tensioners responsible for maintaining sufficient chain levels. Since the systems are subjected to increased loads due to constant movement, the guide chain wears out quickly, resulting in rattling.

Final Thoughts


You can hear various noises from under the hood of the car. In any case, it is recommended to pay attention to it and show the car to specialists. If it turns out that your car needs serious repairs or is beyond repair, you can sell the car. You can contact JunkCarsUs as we buy junk cars in Birmingham, AL, and other cities in the USA.


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