The warm weather is finally here, and you’re itching to get out in the yard and give your lawn that fresh, manicured look. But when you go to pull the cord on your lawn mower, it sputters and coughs, refusing to come to life. You’ve got a lawn mower that’s been sitting all winter, and now you’re wondering how to get it running again. This article will guide you through the process, from basic troubleshooting to more advanced techniques, and help you get your lawn mower roaring back to life.
Overview
Starting a lawn mower that’s been sitting for a while can be a bit of a challenge, but it’s not impossible. The key is to understand the common issues that arise when engines sit idle for prolonged periods and to approach the process systematically.
Check the Basics: Fuel, Battery, and Spark Plug
Before diving into more complex troubleshooting, start with the basics. These simple checks can often solve the problem quickly:
1. Fuel:
- Old Fuel: Old gasoline can gum up the carburetor and prevent the engine from starting. If your mower has been sitting for a few months, it’s best to drain the old fuel and replace it with fresh gasoline.
- Fuel Line: Ensure the fuel line is not clogged or kinked, preventing fuel from reaching the carburetor.
2. Battery (for electric start mowers):
- Charge: If your mower has an electric start, make sure the battery is charged. If it’s been sitting for a long time, it might be completely drained. Use a battery charger to bring it back to life.
- Connections: Check the battery terminals for corrosion and ensure they are securely connected.
3. Spark Plug:
- Condition: A spark plug that’s fouled or corroded can hinder ignition. Remove the spark plug, check its condition, and replace it if it’s worn or damaged.
- Gap: Ensure the spark plug gap is set correctly, as per the manufacturer’s specifications.
Preparing the Engine for Starting
If the basic checks haven’t yielded success, it’s time to prepare the engine for starting. Here’s what to do:
1. Clean the Air Filter
- Dirt and Debris: A dirty air filter restricts airflow, making it difficult for the engine to start.
- Cleaning: Remove the air filter and clean it with compressed air or a brush, depending on the filter type. If it’s too dirty or damaged, replace it.
2. Inspect and Clean the Spark Arrestor
- Function: The spark arrestor prevents hot sparks from escaping the engine and igniting dry grass or other debris.
- Inspection: Ensure the spark arrestor is not clogged with debris.
- Cleaning: Clean the spark arrestor with a wire brush or a small piece of metal to remove any obstructions.
3. Prime the Carburetor
- Purpose: Priming helps introduce fuel into the carburetor, making it easier for the engine to start.
- Procedure: Use the primer bulb (if your mower has one) to pump fuel into the carburetor. Follow the instructions specific to your mower model.
4. Add Starting Fluid (With Caution!)
- Last Resort: Only use starting fluid as a last resort, as it can damage the engine if used frequently.
- Application: Spray a small amount of starting fluid into the air intake while the engine is cranking. Be careful not to use too much, as it can cause backfires.
Attempt to Start the Engine
Now that the mower is prepared, you’re ready to start the engine:
1. Use the Right Starting Procedure
- Manual Start: For manual start mowers, ensure the choke is in the correct position (usually partially engaged for a cold engine).
- Electric Start: If you have an electric start mower, engage the starter switch and hold it for a few seconds.
2. Don’t Give Up Easily
- Persistence: It may take a few attempts for the engine to start. Keep trying, adjusting the choke or throttle if needed.
- Listen for Clues: Pay attention to the engine sounds. A sputtering sound usually means there’s an issue with fuel delivery or ignition.
Troubleshooting: Why Won’t My Lawn Mower Start?
If the lawn mower still won’t start, it’s time to investigate further. Here are some common culprits:
1. Carburetor Problems
- Symptoms: The engine may sputter, cough, or run poorly.
- Causes: A dirty carburetor, clogged fuel jets, or a faulty carburetor diaphragm are common culprits.
- Solutions: You may need to clean or rebuild the carburetor. In some cases, the carburetor might need to be replaced.
2. Fuel System Issues
- Symptoms: The engine may not start at all or run for a short time before dying.
- Causes: A clogged fuel filter, a leaky fuel line, or a faulty fuel pump can restrict fuel flow to the engine.
- Solutions: Check the fuel filter, inspect the fuel lines for leaks or kinks, and check the fuel pump for functionality.
3. Ignition System Problems
- Symptoms: The engine may not spark at all or have a weak spark.
- Causes: A faulty spark plug, a worn or damaged spark plug wire, a failing ignition coil, or a malfunctioning ignition module can all cause ignition problems.
- Solutions: Replace the spark plug and inspect the wires for damage. If the spark is still weak, check the ignition coil and module.
4. Engine Compression Problems
- Symptoms: The engine may crank but not start.
- Causes: Low engine compression can occur due to worn piston rings, valve problems, or a damaged cylinder head.
- Solutions: Compression problems usually require a professional mechanic to diagnose and repair.
Maintenance Tips for a Smooth-Running Lawn Mower
Preventing problems is always easier than fixing them. Here are some maintenance tips to keep your lawn mower running smoothly:
- Regular Oil Changes: Change the engine oil every season or according to the manufacturer’s recommendation.
- Clean Air Filter: Replace or clean the air filter regularly, especially after mowing in dusty conditions.
- Fuel Stabilizer: Add fuel stabilizer to the gas tank before storing your mower for the winter to prevent fuel from degrading.
- Winter Storage: Properly store your mower in a dry place, preferably covered, to prevent rust and corrosion.
Don’t Forget Safety
- Proper Attire: Always wear safety glasses and closed-toe shoes when working on your lawn mower.
- Ventilation: Work in a well-ventilated area and avoid working on the mower in enclosed spaces.
- Fire Hazard: Be aware of fire hazards, especially when working with gasoline or using starting fluid.
Conclusion
Starting a lawn mower that has been sitting can be a bit of a challenge, but with a systematic approach and a few basic troubleshooting steps, you can get it running again in no time. Remember to prioritize safety, inspect the basics, and be patient – you’ll have your mower humming along in no time! If you’re unsure about any part of the process, always consult your lawn mower’s manual or a qualified mechanic.
Frequently Asked Questions
1. What are the most common reasons a lawn mower won’t start after sitting?
The most common reasons a lawn mower won’t start after sitting are related to fuel issues. Old gasoline can gum up the carburetor and fuel lines, preventing fuel from reaching the engine. Another common reason is a dead battery, especially if the lawn mower is battery-powered. Sometimes, simply replacing the spark plug can solve the problem.
Beyond fuel and battery issues, problems with the air filter, spark plug wires, or the starter itself could also prevent your lawn mower from starting. Inspecting these parts and troubleshooting them is crucial when dealing with a lawn mower that has been sitting for a while.
2. How do I check the fuel in my lawn mower?
Check the fuel tank for any signs of rust or debris. If there is any present, you should drain and clean the tank before adding fresh fuel. If the fuel is old, it’s best to drain it and replace it with fresh, high-octane gasoline. This will help prevent any issues caused by stale fuel.
Before adding fresh fuel, you should check for any leaks in the fuel lines and fuel cap. If you find any leaks, they should be repaired before running the lawn mower.
3. What kind of fuel should I use in my lawn mower?
It’s recommended to use high-octane gasoline in your lawn mower. This type of gasoline burns cleaner and has a longer shelf life compared to regular gasoline. Make sure to avoid using gas with ethanol as it can damage the fuel system over time.
When adding fuel, be careful not to overfill the tank. Overfilling can lead to spills and potential fire hazards. Always add fuel in a well-ventilated area and never when the engine is running.
4. How do I check the battery?
If your lawn mower is battery-powered, check the battery terminals for corrosion. Clean any corrosion with a wire brush or a battery terminal cleaner. You can also test the battery with a multimeter to see if it holds a charge.
If the battery is dead or weak, you’ll need to replace it. When buying a new battery, make sure to get one that is compatible with your lawn mower model.
5. How do I clean the air filter?
The air filter helps keep dirt and debris out of the engine. If the air filter is dirty or clogged, it can restrict airflow and prevent the engine from starting. To clean the air filter, you can use a vacuum cleaner with a brush attachment to remove any loose dirt.
For a more thorough cleaning, you can wash the air filter with soap and water. Make sure to let the filter dry completely before putting it back in the mower.
6. How do I clean the spark plug?
The spark plug ignites the fuel mixture in the engine. If the spark plug is dirty or corroded, it can prevent the engine from starting. To clean the spark plug, you can use a wire brush or a spark plug cleaning tool.
Once the spark plug is clean, you can test it using a spark plug tester. If the spark plug is faulty, you’ll need to replace it.
7. What if my lawn mower still won’t start?
If your lawn mower still won’t start after trying the above steps, you may need to take it to a qualified mechanic for further diagnosis and repair. They can inspect the engine and other components to identify the cause of the problem.
However, before taking your lawn mower to a mechanic, try checking for any loose connections or broken wires. Sometimes, simply tightening loose connections or replacing a broken wire can fix the problem. Also, make sure you are using the correct type of oil for your lawn mower.