My lawnmower made a loud pop and won’t start (What should I do?)

Lawnmowers are important devices that most people use to maintain their gardens, especially when making the grass neat and smart. Usually, they have an engine that enables them to run more effectively and require power to make the blades trim the grass in the garden or outside the house. Also, the machines reduce the labor necessary to neaten the compound and garden.

Despite being effective, the lawnmower machine may produce pop noise when in use. Also, the device may fail to function as usual or fail to start after powering it on. The two issues are common and affect many homeowner users. The issues are fixable as long as you follow the recommended process and the manufacturer’s manual guide. Therefore, don’t worry if your machine starts misbehaving when in use or not in use.

Luckily, the article below describes the reasons why the lawnmower may fail to start after turning on and the reasons why it may emit a loud noise when in use. Also, it shows the best steps to follow when trying to fix the two issues, including the FAQs concerning the same. Therefore, ensure you review the article below carefully if you have issues with your device, and don’t forget to seek help if the issue persists.

Reasons why the lawnmower may backfire when turning on and make a popping noise

lawn mower made a loud pop and wont start

Several reasons can lead to the machine failing to turn on when trying to use it. Review the information below and understand the common causes of the issue.

1. High engine temperatures

High temperatures, more than the normal ones, usually interfere with the correct functioning of the machine. When the temperatures are high, the engine fails to function as usual; it starts and then comes to a sudden stop. In such a situation, the best way to fix it is to regulate the temperature to the normal one to bring the machine’s internal parts to correct functioning.

2. High engine speed

If you run the engine at high speed, the machine starts and comes to an instant stop. High-speed results in overworking the engine and the internal parts of the lawnmower, thus reducing the machine’s performance. Therefore, it is essential to use the recommended speed to run the machine to avoid inconveniences.

3. Loose carburetor regulations

If the machine carburetor has loose adjustments, the machine will automatically fail to function as usual and start to emit noise when in use. The noise is usually irritating and requires instant fixation to bring it to correct functioning.

Also, a loose carburetor may result in the machine failing to start even after connecting it to the power supply source. Therefore, ensure the carburetor is tight, but if the issue persists, seek help.

4. No power supply

If the device has no charge, it will automatically fail to start eve after switching on. First, charge the machine and try turning it on to see if the issue persists. If not, check the condition of the socket and ensure it is functioning correctly. To get more accurate results, try using another socket. Also, ensure there is a continuous power supply if there is an electricity blackout.

If the issue is not with power limitation or a faulty socket, check the machine’s charger. The charger may fail to transmit power to the machine resulting in it failing to turn off. Try using another charger that suits your machine and ensure it is functioning correctly. Connect it to the power supply source and test to see if it turns on and if not, seek help from an expert.

5. Presence of gasoline

Gasoline in the machine affects the normal functioning of the machine as it fills the engine, hindering it from rotating freely. As a result, a loud noise is emitted, which most of the time is irritating. Try eliminating the gasoline and test the machine to see if it is functioning as required.

6. Faulty engine

The common cause of the machine failing to turn on and emitting noise is a faulty engine. If the engine fails to spin freely, there is loud and unwanted noise emitted.  Also, a faulty engine prevents the machine from turning on. Check the engine and identify any issues relating to it. Fix the issues and test to see if it is functioning correctly.

7. Too much air in the mix

It might result in an excessive amount of air in the blend, resulting in a lean blend. Incomplete burning due to the whiffing, the lean blend is driven into the exhaust pipe, where it bursts into flames with the audible bursting noise. It appears to be a lengthy procedure, but it happens in a split second due to the machine’s perfect timing.

8. Accumulation of rust

Rust prevents the engine from spinning freely, resulting in the emission of unwanted noise. Attempt to eliminate corrosion and metal residues from the gas tank and other mechanical components. Corrosion in the gas tank can get into the engine and cause it to wear faster.

9. Poor maintenance of the machine

Conduct regular inspections and repair the motor, carburetor, and fuel line.

Steps on how to fix the lawnmower failing to turn on

Examine the fuel’s effectiveness:

failing to turn on can happen if the gas you’re using isn’t up to par. Your motor may explode if you use gas that contains a lot of alcohol. Fuel with a higher percentage of alcohol mixes is less suitable for tiny motors. To maintain your lawnmower’s motor safety and functioning properly, use fuel with gentle alcohol mixes. Take the faulty gas from the tank and replace the more appropriate type.

Set the carburetor: 

 Carburetors are prone to clogging and limitations, frequently resulting from outdated or poor fuel quality. If you want to maintain your motor going efficiently, you should set your carburetor regularly. Screws up and stalling can occur if the carburetor is not tuned properly.

It may cause problems if the carburetor modification is done too low. When beginning, most failing to turn on occur thru the carburetor. Failing to turn on occurs when the carburetor is not properly set. It occurs when there is a problem with the cylinders or the master cylinder. Wipe the carburetor with a carburetor cleaning or dismantle and wash it. After it’s tidy, make the necessary adjustments.

Ensure basic temperatures and pressures

failing to turn on is also influenced by motor temperatures. Failing to turn on can occur if the motor level is too hot. Examine your motor’s temperature. It must have an ordinary working temperature but not feel like a heat source if it is just running. A limited fuel pressure might be the reason for the motor speed heat.

As an outcome, the fuel-to-air balance is off, and there is too much air in the fuel tank. The motor will be unable to generate additional power to burn the gasoline. Gasoline injectors and older fuel lines are also affected by low fuel injection.

Inspect the lawnmower duration: 

Tuning involves adjusting the motor’s timing, which, if not done correctly, might cause a starter motor to ignite at the incorrect moment. It may backfire. The ratio between the motor and the cylinders can alter over time, necessitating precise adjustment. Gasoline filters that have become faulty may potentially prevent the engine from turning on.

How to fix a lawn mower’s loud noise?

Steps on how to fix the lawnmower failing to turn on.

To fix the loud noise in the lawnmower, use the steps below;

1. Check the engine fuel and change it if dirty. Also, change the air filters and ensure to use the correct fuel for your machine.

2. Repair the muffler and let it cool for some time. Also, install the new muffler if it is faulty beyond repair.

3. Remove any debris clogging the machine, preventing it from functioning as usual. Use the recommended tool to clean, such as a thin brush or a vacuum cleaner to suck all dirt.

4. Tighten the loose blade present in the machine. When fixing the blade, take precautions such as handling the blades to prevent them from breaking or becoming blunt.

5. Test the machine, but if the issue persists, seek help from an expert to help you detect the issue and fix it accordingly.

Frequently asked questions;

What makes a lawnmower engine fail to turn on?

Backfiring of the machine is a result of unburned fuel in the emissions combusting or exploding. Backfires can be a result of blocked pipes or malfunctioning fuel pumps, among other things.

Is a lawnmower engine harmed by end up backfiring?

Yes, a lawnmower may fail to function by turning off. It has an impact on both the motor and the catalytic converter. Going backfire can cause engine problems because it causes short spurts of fire in the wrong spot.


Backfiring and loud noises are frequent lawn mower issues, but they are not hard to resolve regardless of the reason. Loud noise can happen anytime, such as when you start the motor, when you remove your foot from the gas pedal, or when the motor is off. In this blog post, we’ve identified the most prevalent reasons for failing to turn on and how to repair them.

Finally, backfires and loud noise can occur purely due to the muffler’s structure and the responsiveness of the microchannel. There is no solution in these circumstances other than changing the exhaust. Maintaining your lawn mower will help it last longer and reduce the risk of a backfire.

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