The smell of freshly cut grass, the feeling of the sun on your skin, and the satisfaction of a well-maintained lawn – these are all things that can be quickly ruined by a lawn mower that keeps cutting out. It can be frustrating and time-consuming, leaving you wondering what’s wrong with your trusty machine. This article will explore the most common reasons why your lawn mower might be sputtering and dying, providing you with the knowledge and steps to diagnose the problem and get back to mowing in no time. We’ll delve into potential issues with the fuel system, engine, and spark plugs, as well as offer troubleshooting tips to help you pinpoint the culprit.
In short, there are many reasons why your lawn mower might be cutting out. The most common culprits include fuel problems (like a clogged fuel filter or a bad fuel), issues with the engine’s air intake system (like a clogged air filter), spark problems (like a fouled or worn spark plug), and problems with the mower’s electrical system (like a faulty ignition coil). We’ll examine each of these possible problems in detail below.
Fuel System Problems
The fuel system of a lawn mower plays a crucial role in delivering a steady supply of fuel to the engine. If there’s a problem in this system, your lawn mower might suddenly cut out.
1. Clogged Fuel Filter
The fuel filter is a small but essential component that prevents debris and dirt from entering the fuel lines and the engine. If the fuel filter is clogged, it will restrict the flow of fuel to the engine, leading to the mower cutting out.
Here’s how to check your fuel filter:
- Locate the fuel filter: The fuel filter is typically a small, cylindrical component found in the fuel line, usually near the fuel tank or carburetor.
- Inspect the filter: Look for signs of dirt, debris, or discoloration on the filter.
- Replace the filter: If the filter is dirty or clogged, replace it with a new one.
2. Bad Fuel
Fuel can go bad over time, especially if it’s left in the tank for an extended period. Old fuel can gum up the carburetor and fuel lines, causing the lawn mower to sputter and die.
How to troubleshoot fuel problems:
- Drain the fuel tank: Completely drain the old fuel from the tank.
- Clean the fuel lines: Use a fuel line cleaner to clear any debris or blockages.
- Fill the tank with fresh fuel: Use fresh, high-quality gasoline.
3. Clogged Fuel Lines
Even if your fuel filter is clean, the fuel lines themselves can become clogged with debris or sediment. This can restrict fuel flow and cause the engine to cut out.
Here’s how to check your fuel lines:
- Inspect the fuel lines: Look for any visible blockages or kinks.
- Clean or replace the fuel lines: If you find any issues, clean the lines thoroughly or replace them if necessary.
Engine Issues
The engine of your lawn mower is the heart of the machine, and a problem with the engine can lead to the mower cutting out.
1. Clogged Air Filter
The air filter cleans the air that enters the engine, preventing dust and debris from reaching the sensitive parts. A clogged air filter can restrict airflow to the engine, causing it to run poorly and eventually cut out.
How to check your air filter:
- Locate the air filter: The air filter is typically found in a housing near the carburetor.
- Inspect the filter: Look for any visible dirt, dust, or grime.
- Clean or replace the filter: If the filter is dirty, clean it with compressed air or replace it with a new one.
2. Dirty or Damaged Carburetor
The carburetor is responsible for mixing fuel and air to create a combustible mixture for the engine. A dirty carburetor can cause fuel starvation, leading to the mower cutting out.
How to troubleshoot carburetor problems:
- Clean the carburetor: Disassemble the carburetor and clean all the parts with carburetor cleaner.
- Adjust the carburetor: Once cleaned, adjust the carburetor settings according to the manufacturer’s instructions.
3. Spark Plug Issues
The spark plug ignites the fuel-air mixture, causing the engine to run. A faulty spark plug can prevent the engine from firing properly, leading to the mower cutting out.
Here are some common spark plug problems:
- Fouled spark plug: A fouled spark plug is covered in carbon and oil deposits, preventing it from sparking properly.
- Worn spark plug: A worn spark plug may have a gap that is too large, causing it to misfire.
How to troubleshoot spark plug issues:
- Inspect the spark plug: Remove the spark plug and inspect it for any signs of fouling or wear.
- Replace the spark plug: If the spark plug is fouled or worn, replace it with a new one.
4. Ignition Coil
The ignition coil is responsible for generating the high-voltage spark that ignites the fuel-air mixture. If the ignition coil is faulty, it won’t produce the necessary spark, and the engine won’t start or will cut out.
How to check the ignition coil:
- Visual inspection: Look for any signs of damage or corrosion.
- Test the coil: Use a multimeter to test the resistance of the ignition coil.
Electrical System Issues
The electrical system of a lawn mower is responsible for powering the ignition system, starting motor, and other components.
1. Faulty Battery
A faulty battery can cause the lawn mower to not start or to cut out while running. This is especially common in electric lawn mowers.
How to troubleshoot a faulty battery:
- Check the battery terminals: Make sure the battery terminals are clean and secure.
- Test the battery voltage: Use a multimeter to test the battery voltage. If it’s too low, replace the battery.
2. Faulty Ignition Switch
The ignition switch controls the flow of electricity to the ignition system. A faulty ignition switch can prevent the engine from starting or cause it to cut out while running.
How to check the ignition switch:
- Inspect the ignition switch: Look for any signs of damage or corrosion.
- Test the ignition switch: Use a multimeter to test the continuity of the ignition switch.
General Troubleshooting Tips
- Check the fuel level: Make sure the fuel tank is full.
- Inspect the air intake: Make sure the air intake is clear of any obstructions.
- Check the spark plug: Make sure the spark plug is properly installed and in good condition.
- Clean the engine: A dirty engine can lead to overheating and other problems.
When to Call a Professional
If you’ve tried all of these troubleshooting tips and your lawn mower is still cutting out, it’s time to call a professional. A mechanic can diagnose the problem and repair it quickly and efficiently.
Here are some signs that you should call a professional:
- The engine is making unusual noises: If you hear any unusual noises, like knocking, grinding, or rattling, it’s best to get it checked out by a professional.
- The engine is smoking: Excessive smoke from the engine can be a sign of a serious problem, such as a blown head gasket.
- The engine is leaking fluids: Leaking fluids can be a sign of a problem with the engine, cooling system, or fuel system.
Conclusion
A lawn mower that keeps cutting out can be a frustrating problem, but by understanding the most common causes and troubleshooting steps, you can often diagnose and fix the issue yourself. Remember to check the fuel system, the engine, the spark plug, and the electrical system for potential problems. If all else fails, don’t hesitate to call a professional for help. With a little time and effort, you’ll be back to enjoying a beautifully cut lawn in no time.
FAQ
Why is my lawnmower cutting out?
There are several reasons why your lawnmower might be cutting out. The most common culprits are issues with the fuel system, spark plug, or air filter.
First, check if the fuel tank is empty or if the fuel line is clogged. You should also inspect the fuel filter for any blockages. If the fuel system is clean and the tank is full, the problem might be with the spark plug. A dirty or worn-out spark plug can prevent the engine from starting or running smoothly. Finally, a clogged air filter can restrict airflow to the engine, causing it to sputter and die.
How do I troubleshoot a lawnmower that keeps cutting out?
The best way to troubleshoot a lawnmower that keeps cutting out is to start by checking the basics. Make sure the fuel tank is full and that the fuel lines are clear. Next, inspect the spark plug for wear and tear and replace it if necessary. Finally, check the air filter for dirt and debris, and replace it if it is dirty or clogged.
If you have checked all of these things and your lawnmower is still cutting out, you may need to take it to a professional mechanic for further diagnosis.
What are the signs of a bad spark plug?
A bad spark plug can cause a variety of problems, including your lawnmower cutting out. Some signs of a bad spark plug include difficulty starting the engine, sputtering or misfiring, and a decrease in engine power.
If you suspect your spark plug is bad, it’s best to replace it as soon as possible. You can also test the spark plug by removing it and holding it to a metal surface while grounding the wire. If you see a bright blue spark, then the plug is good. If you see a weak spark or no spark at all, then the plug is likely bad.
What happens when the air filter is clogged?
A clogged air filter can restrict airflow to the engine, making it difficult to breathe and causing it to run poorly. This can lead to a variety of problems, including your lawnmower cutting out.
If your air filter is clogged, you should replace it as soon as possible. You can also clean a reusable air filter by tapping it against a hard surface to remove loose dirt and debris. If the filter is still dirty, you can wash it with soap and water, then let it dry completely before reinstalling it.
How do I clean the fuel lines?
Cleaning the fuel lines is a simple process that can help to improve your lawnmower’s performance and prevent it from cutting out. You can clean the fuel lines by using a fuel line cleaner or by running a wire brush through the lines.
To clean the fuel lines using a fuel line cleaner, simply pour the cleaner into the fuel tank and run the engine for a few minutes. The cleaner will dissolve any deposits in the lines and allow the fuel to flow freely. If you choose to use a wire brush, be sure to remove the fuel tank before cleaning the lines. Insert the brush into the line and gently move it back and forth to remove any dirt or debris.
What if the fuel is bad?
If the fuel in your lawnmower is old or has gone bad, it can cause a variety of problems, including your lawnmower cutting out. Old fuel can gum up the carburetor and fuel lines, making it difficult for the engine to run properly.
If you suspect your fuel is bad, the best solution is to drain it and replace it with fresh fuel. You can also add a fuel stabilizer to the tank to prevent fuel from going bad in the future.
Can I fix my lawnmower myself?
You can fix some of the problems that cause a lawnmower to cut out yourself, but more complex issues may require a professional mechanic. Basic troubleshooting, such as checking the fuel tank, spark plug, and air filter, can be done by most homeowners.
However, if the problem persists, it’s best to take your lawnmower to a professional mechanic for diagnosis and repair. A mechanic will be able to identify the root cause of the problem and fix it properly, ensuring that your lawnmower is running safely and efficiently.