The peaceful hum of your lawnmower, a symphony of freshly cut grass, suddenly turns into a sputtering death rattle. You’re left staring at a silent, immobile machine, your manicured lawn dreams quickly turning into a nightmare. This frustrating scenario is a common problem for many lawnmower owners, but don’t fret! This article will dissect the common culprits behind your sputtering lawnmower, provide clear explanations of why it’s happening, and offer practical troubleshooting tips to get you back to mowing in no time.
In short, a sputtering lawnmower that dies can be caused by a variety of factors, ranging from a simple fuel issue to a more complex engine problem. The most common culprits include:
- Fuel Problems: Dirty or stale fuel, a clogged fuel filter, or a faulty fuel pump can prevent the engine from receiving the necessary fuel to run smoothly.
- Ignition Issues: A faulty spark plug, spark plug wire, or ignition coil can disrupt the spark needed to ignite the fuel-air mixture.
- Air Intake Problems: A clogged air filter, a damaged carburetor, or a loose air intake hose can hinder the engine’s ability to draw in the proper amount of air.
- Engine Problems: A worn-out engine, a broken valve, or a damaged piston can lead to a loss of power and eventually cause the engine to stall.
Let’s delve deeper into each of these potential causes and explore their solutions.
Fuel-Related Issues: The Root of the Problem
Fuel problems are often the primary suspects when a lawnmower starts to sputter and die. Here’s a closer look at the common culprits:
1. Old or Dirty Fuel: A Common Culprit
Fuel doesn’t stay fresh forever. Over time, gasoline can deteriorate, forming deposits and gum that can clog fuel lines and prevent the engine from receiving the fuel it needs. This is particularly true if the fuel has been sitting in the tank for an extended period, especially during the off-season.
Solution:
- Drain and Replace: The simplest solution is to drain the old fuel and replace it with fresh, high-octane gasoline. Always use fuel stabilizer to prevent fuel from going bad in the future.
- Clean the Fuel Lines: If your lawnmower hasn’t been used in a while, it’s a good idea to clean the fuel lines to remove any accumulated deposits.
- Prevent Fuel Problems: Always use fresh gasoline, store your lawnmower with a full tank to reduce condensation, and use fuel stabilizer to prevent fuel from going bad.
2. Clogged Fuel Filter: A Silent Saboteur
A clogged fuel filter can significantly restrict fuel flow to the engine. This can lead to sputtering and eventually cause the engine to die, particularly when the lawnmower is under load.
Solution:
- Inspect and Replace: The fuel filter is usually located near the fuel tank. Visually inspect the filter for any visible blockage or discoloration. If it appears clogged, replace it with a new one.
- Clean the Filter: Some fuel filters can be cleaned. Consult your lawnmower’s manual for specific instructions.
3. Faulty Fuel Pump: A Hidden Troublemaker
A faulty fuel pump is less common, but it can still be a major problem. The fuel pump is responsible for delivering fuel from the tank to the carburetor. If it fails, the engine won’t receive any fuel and will quickly sputter to a stop.
Solution:
- Inspect the Fuel Pump: If you suspect a faulty fuel pump, inspect it for any signs of damage or leaks. You can also test the pump’s output with a fuel pressure gauge.
- Replace the Fuel Pump: If the fuel pump is faulty, it will need to be replaced. This can be a more complex repair and may require professional assistance.
Ignition Problems: Sparking Trouble
The ignition system is responsible for creating the spark that ignites the fuel-air mixture in the engine. If there’s an issue with the ignition system, the lawnmower will struggle to start or may sputter and die.
1. Faulty Spark Plug: A Common Culprit
A spark plug is a vital component of the ignition system, responsible for delivering a spark to ignite the fuel-air mixture. Over time, spark plugs can wear out, become fouled with carbon deposits, or experience a gap issue.
Solution:
- Inspect and Replace: Remove the spark plug and inspect it for signs of wear, fouling, or a damaged electrode. If the spark plug appears worn, fouled, or damaged, replace it with a new one.
- Check the Spark Plug Gap: The spark plug gap should be within the specified range listed in your lawnmower’s manual. If the gap is incorrect, it can be adjusted using a spark plug gap tool.
- Clean the Spark Plug: If the spark plug is fouled, you can attempt to clean it using a wire brush or sandpaper. However, if the spark plug is severely fouled, it’s best to replace it.
2. Damaged Spark Plug Wire: A Silent Saboteur
The spark plug wire connects the spark plug to the ignition coil, transmitting the electrical current needed to create the spark. If the spark plug wire is damaged or corroded, it can prevent the spark from reaching the spark plug.
Solution:
- Inspect the Spark Plug Wire: Inspect the spark plug wire for signs of damage, cracks, or corrosion. If the wire appears damaged, replace it with a new one.
- Check the Spark Plug Wire Connections: Ensure that the spark plug wire is securely connected to the spark plug and the ignition coil. Loose connections can cause intermittent problems.
3. Faulty Ignition Coil: A Hidden Troublemaker
The ignition coil is responsible for generating the high-voltage current that travels to the spark plug to create the spark. If the ignition coil fails, the lawnmower will not start or will sputter and die.
Solution:
- Test the Ignition Coil: You can test the ignition coil using a multimeter. If the ignition coil fails the test, it needs to be replaced.
- Replace the Ignition Coil: Replace the ignition coil with a new one. This can be a more complex repair and may require professional assistance.
Air Intake Problems: A Need for Breath
The engine needs a constant supply of air to mix with fuel and create a combustible mixture. If the air intake is restricted or blocked, the engine will struggle to run smoothly and may sputter and die.
1. Clogged Air Filter: A Common Culprit
The air filter is designed to prevent dirt, dust, and debris from entering the engine. Over time, the air filter can become clogged, restricting airflow and reducing engine performance.
Solution:
- Inspect and Clean: Inspect the air filter for any visible debris or discoloration. If the air filter is dirty, clean it by gently tapping it against a hard surface or using compressed air. If the air filter is heavily soiled or damaged, replace it with a new one.
- Replace the Air Filter: If the air filter is beyond cleaning, replace it with a new one. Ensure that the air filter is properly installed and fits securely.
2. Damaged Carburetor: A Hidden Troublemaker
The carburetor is responsible for mixing air and fuel in the correct proportions. If the carburetor is damaged or clogged, it can affect the fuel-air mixture, leading to sputtering and stalling.
Solution:
- Clean the Carburetor: Clean the carburetor using a carburetor cleaning kit. This involves removing the carburetor from the engine and disassembling it to clean all the internal parts.
- Rebuild or Replace the Carburetor: If the carburetor is severely damaged, you may need to rebuild it or replace it with a new one.
3. Loose Air Intake Hose: A Simple Fix
The air intake hose connects the air filter to the carburetor. If the hose is loose or damaged, it can create an air leak, which can disrupt the fuel-air mixture and lead to sputtering and stalling.
Solution:
- Inspect the Air Intake Hose: Inspect the air intake hose for any signs of damage, cracks, or loose connections.
- Secure the Air Intake Hose: If the hose is loose, secure it to the air filter and carburetor. If the hose is damaged, replace it with a new one.
Engine Problems: The Heart of the Matter
While fuel and ignition issues are the most common culprits for a sputtering lawnmower, engine problems can also play a role.
1. Worn-Out Engine: The End of the Road
Over time, the engine parts can wear out due to normal use and tear. This wear and tear can lead to reduced engine performance and ultimately cause the engine to sputter and die.
Solution:
- Rebuild or Replace the Engine: If the engine is severely worn out, you may need to rebuild it or replace it with a new one. This can be a major repair and may require professional assistance.
2. Broken Valve: A Serious Issue
The valves in the engine are responsible for controlling the flow of air and exhaust gases. If a valve breaks or becomes damaged, it can prevent the engine from operating properly, leading to sputtering and stalling.
Solution:
- Repair or Replace the Valve: If a valve is broken or damaged, it will need to be repaired or replaced. This is a complex repair that requires specialized tools and expertise and should be performed by a qualified mechanic.
3. Damaged Piston: A Major Problem
The piston is responsible for transferring power from the combustion process to the crankshaft. If the piston is damaged, it can prevent the engine from operating properly, leading to sputtering and stalling.
Solution:
- Repair or Replace the Piston: If the piston is damaged, it will need to be repaired or replaced. This is a major repair that requires specialized tools and expertise and should be performed by a qualified mechanic.
Troubleshooting Tips: A Practical Approach
Now that you understand the potential causes, let’s explore some practical troubleshooting steps you can take to diagnose and fix the problem:
- Check the Fuel: Start by checking the fuel level in the tank and ensuring that it’s fresh and clean. If the fuel is old or dirty, drain it and replace it with fresh, high-octane gasoline.
- Inspect the Air Filter: Check the air filter for debris or discoloration. If it’s dirty, clean or replace it.
- Inspect the Spark Plug: Remove the spark plug and inspect it for signs of wear, fouling, or damage. If it’s worn or fouled, replace it.
- Check the Spark Plug Wire: Inspect the spark plug wire for damage, cracks, or corrosion. If it appears damaged, replace it.
- Check the Air Intake Hose: Ensure that the air intake hose is securely connected to the air filter and carburetor. If it’s loose or damaged, replace it.
- Test the Spark: You can test the spark by grounding the spark plug to a metal part of the engine and cranking the engine. If there’s a strong spark, the ignition system is likely working.
- Check the Carburetor: If you suspect a carburetor problem, clean or rebuild it.
Seeking Professional Help: When to Call an Expert
While some basic troubleshooting can be done at home, certain issues require professional expertise. If you’re unable to diagnose or fix the problem yourself, consider seeking help from a qualified mechanic. Here are some signs that you should call a professional:
- The problem persists after basic troubleshooting.
- You suspect a major engine problem.
- You’re not comfortable working on your lawnmower.
By following these tips and seeking professional help when needed, you can identify and resolve the cause of your sputtering lawnmower and get back to enjoying a well-manicured lawn.
FAQ
Why is my lawnmower sputtering then dying?
This is a common problem that can be caused by a number of factors, but the most likely culprits are fuel-related. The first thing to check is the fuel itself. Old, stale gasoline can cause sputtering and stalling, so it’s a good idea to drain and replace it if it’s been sitting for a while. You should also check the fuel filter to make sure it’s clean and not clogged. If the fuel is fresh and the filter is clean, the problem may lie with the carburetor. The carburetor can become clogged with dirt or debris, or the fuel lines can become blocked. Cleaning or replacing the carburetor may solve the problem.
Another possibility is a faulty spark plug. A worn-out or dirty spark plug can prevent the engine from starting or running smoothly. If the spark plug is the problem, you can replace it with a new one. Finally, make sure your lawnmower is getting enough air. A clogged air filter can restrict airflow to the engine, causing it to sputter and die. Cleaning or replacing the air filter may solve the problem. If none of these solutions work, you may need to take your lawnmower to a professional for repair.
What should I do if my lawnmower sputters then dies?
The first step is to try to identify the cause of the problem. Look for signs of fuel issues, such as a dirty fuel filter or old gasoline. Also, check the spark plug and air filter to see if they are clean and functioning properly. If you’re not sure what the problem is, it’s always a good idea to consult with a qualified mechanic.
If you’re comfortable working on your lawnmower, you can try to fix the problem yourself. Start by checking the fuel system, then move on to the spark plug and air filter. If you’re still having trouble, you can take your lawnmower to a repair shop.
How do I clean a lawnmower carburetor?
Cleaning a lawnmower carburetor is a relatively simple task that can be done with a few basic tools. You’ll need a carburetor cleaner, a small brush, and some rags. First, disconnect the fuel line from the carburetor and remove the carburetor from the engine. Then, spray the carburetor cleaner into the carburetor and let it soak for a few minutes. Use the brush to scrub the inside of the carburetor, making sure to remove any dirt or debris. Once the carburetor is clean, reassemble it and reconnect the fuel line.
If you’re not comfortable cleaning the carburetor yourself, you can take it to a repair shop. However, if you’re willing to put in a little effort, you can save money by cleaning it yourself.
How often should I replace my lawnmower spark plug?
The frequency of spark plug replacement depends on a variety of factors, such as the type of engine, the quality of the spark plug, and the frequency of use. However, it’s generally recommended to replace the spark plug every 100 hours of operation or once a year.
If you’re not sure when your spark plug was last replaced, it’s a good idea to err on the side of caution and replace it. A new spark plug will help your lawnmower run smoothly and efficiently.
How do I clean my lawnmower air filter?
Cleaning your lawnmower air filter is essential for maintaining the performance of your engine. A dirty air filter can restrict airflow to the engine, causing it to sputter and die. To clean the air filter, first remove it from the engine. Then, use a vacuum cleaner with a brush attachment to remove any dirt or debris from the filter. If the filter is heavily soiled, you can wash it with soapy water and let it air dry completely before reinstalling it.
If your air filter is damaged or beyond cleaning, you should replace it with a new one.
Can I use gasoline from a gas can that has been sitting around?
While it may be tempting to use up old gasoline, it is not recommended. Old gasoline can cause problems with your lawnmower’s engine, including sputtering, stalling, and even damage to the carburetor. It’s best to use fresh gasoline that has been stored properly. If you have old gasoline, you can dispose of it properly by taking it to a hazardous waste facility.
You can also use a fuel stabilizer to help extend the shelf life of gasoline. Fuel stabilizers help to prevent the breakdown of gasoline, which can occur over time.
What are some tips for preventing my lawnmower from sputtering and dying?
One of the best things you can do is to use fresh, high-quality gasoline. You should also regularly maintain your lawnmower by cleaning the air filter, spark plug, and carburetor. Finally, be sure to store your lawnmower properly in a dry, well-ventilated area when not in use.
By following these tips, you can help to prevent your lawnmower from sputtering and dying and keep it running smoothly for years to come.