Spring has sprung, the sun is shining, and you’re itching to get your lawn in tip-top shape. But when you pull out your trusty lawn mower, you’re met with a disheartening silence – it won’t start! It’s a frustrating experience, especially when you’re eager to tackle the first mow of the season. This article will explore the common reasons why your lawn mower might refuse to fire up after a long winter slumber, providing you with solutions and preventative measures to get your mower roaring back to life.
In short, a lawn mower that won’t start after winter is often due to a combination of factors: the fuel system could be compromised by old gas, the battery could be drained, the spark plug might be fouled, or the engine could be starved for air due to a clogged air filter.
Assessing the Situation: The First Steps
Before diving into specific troubleshooting steps, it’s important to take a methodical approach to diagnose the problem. Here’s a simple checklist to start with:
1. Check the Basics:
- Is the fuel tank empty? This might seem obvious, but it’s worth a quick check.
- Is the fuel shutoff valve open? Make sure the fuel supply is flowing to the engine.
- Is there fresh gasoline in the tank? Old gasoline can go bad and clog the fuel system.
2. Spark Plug Check:
- Remove the spark plug. If it’s excessively fouled with black soot, it needs to be cleaned or replaced.
- Inspect the spark plug wire. Ensure it’s securely attached and not cracked or frayed.
3. Battery Check (for electric or battery-powered mowers):
- Check the battery terminals. Make sure they are clean and free of corrosion.
- Test the battery voltage. If it’s below 12 volts, the battery may need charging or replacing.
Troubleshooting Common Starting Issues
Once you’ve checked the basics, you can begin troubleshooting more specific problems.
Fuel System Issues
1. Old Fuel: A Common Culprit
Gasoline deteriorates over time, losing its volatility and forming gum and varnish that can clog fuel lines and carburetors. This is a common reason why lawn mowers refuse to start after winter.
Solution:
- Drain the old fuel: Completely empty the fuel tank and discard the old gasoline. Never pour it down the drain. Check with your local waste disposal center for proper disposal procedures.
- Fill with fresh fuel: Add fresh, high-octane gasoline to the tank.
- Add fuel stabilizer: Adding fuel stabilizer to your tank can prevent future fuel degradation.
Tip: It’s a good idea to drain your lawn mower’s fuel tank before winter storage.
2. Clogged Fuel Lines and Carburetor
If old fuel has been sitting in your lawn mower, it can clog fuel lines and the carburetor.
Solution:
- Clean the fuel lines: Carefully remove the fuel lines and use a small wire brush or compressed air to clear any blockages.
- Clean the carburetor: If the carburetor is clogged, it may need to be disassembled and cleaned. This is a more advanced task and may require a carburetor cleaning kit.
Tip: Avoid using gasoline-based carburetor cleaners as they can damage rubber parts. Opt for a cleaner specifically designed for carburetor cleaning.
3. Fuel Pump Issues
The fuel pump is responsible for delivering fuel from the tank to the carburetor. A faulty fuel pump can prevent fuel from reaching the engine.
Solution:
- Inspect the fuel pump: Check for any leaks or damage.
- Test the fuel pump: There are ways to test the fuel pump’s operation, but this may require a specialized tool or an understanding of your mower’s system.
Tip: If you suspect a fuel pump problem, it’s best to consult with a qualified mechanic.
Engine Issues
1. Spark Plug Fouling
A fouled spark plug can prevent a spark from igniting the fuel mixture, leading to a no-start condition.
Solution:
- Clean the spark plug: Remove the spark plug and use a wire brush to clean off any carbon deposits.
- Replace the spark plug: If the spark plug is heavily fouled or worn, it’s best to replace it with a new one.
Tip: Use a spark plug wrench to remove and install the spark plug.
2. Clogged Air Filter
A dirty or clogged air filter restricts airflow to the engine, making it difficult to start and run smoothly.
Solution:
- Clean or replace the air filter: Remove the air filter and clean it with compressed air or replace it with a new one.
Tip: Check the air filter regularly and replace it as needed.
3. Faulty Ignition System
The ignition system is responsible for generating the spark that ignites the fuel mixture. A faulty ignition system can cause a no-start condition.
Solution:
- Inspect the ignition coil: Check for cracks, damage, or loose connections.
- Test the ignition coil: There are ways to test the ignition coil’s operation, but this may require specialized equipment.
- Check the ignition wires: Ensure they are securely connected and not damaged.
Tip: If you suspect a problem with the ignition system, it’s best to consult with a qualified mechanic.
Battery Issues (For Electric and Battery-Powered Mowers)
1. Dead Battery
A dead battery is the most common reason why an electric or battery-powered lawn mower won’t start.
Solution:
- Charge the battery: Connect the battery to a charger and allow it to charge fully.
- Replace the battery: If the battery is old or damaged, it may need to be replaced.
Tip: Always check the battery terminals for corrosion and clean them before charging.
2. Battery Terminal Corrosion
Corrosion on battery terminals can prevent proper electrical contact, making it difficult to start the mower.
Solution:
- Clean the battery terminals: Use a wire brush or a battery terminal cleaning solution to remove any corrosion.
Tip: Apply a thin layer of petroleum jelly to the cleaned terminals to prevent future corrosion.
Preventing Future Starting Problems
Taking preventive measures can help ensure your lawn mower starts reliably every spring.
- Store your mower properly: Before storing your lawn mower for the winter, drain the fuel tank and run the engine until it stops to clear the fuel lines. This will prevent the fuel from going bad and clogging the carburetor.
- Change the oil: Change the oil before storing your mower to prevent sludge from forming.
- Clean the mower: Remove any debris or grass clippings from the mower before storing it.
- Cover the mower: Cover the mower with a tarp or waterproof cover to protect it from the elements.
- Inspect the battery (for electric mowers): Charge the battery fully before storing it for the winter and store it in a cool, dry place.
When to Call a Professional
If you’ve tried all the troubleshooting steps above and your lawn mower still won’t start, it’s time to call in a professional. A qualified mechanic can diagnose and repair more complex issues, such as:
- Faulty engine components: The engine could have a problem with a piston, connecting rod, or other internal parts.
- Electrical problems: There could be a problem with the wiring or electrical system that requires professional expertise.
- Carburetor problems: A complex carburetor problem may require specialized tools and knowledge to repair.
By following these tips and taking preventive measures, you can minimize the chances of your lawn mower failing to start after winter and enjoy a hassle-free mowing season. Remember, a little preventative maintenance goes a long way in keeping your lawn mower running smoothly.
FAQ
1. Why does my lawn mower struggle to start after winter?
After a long winter, your lawn mower’s engine can be affected by several factors:
- Fuel Degradation: Gasoline breaks down over time, becoming stale and gumming up the engine.
- Battery Discharge: Even a fully charged battery can lose its charge over time, especially in cold temperatures.
- Spark Plug Issues: Spark plugs can become fouled or corroded during storage, hindering ignition.
- Old Oil: Engine oil can thicken in cold weather, slowing the engine’s startup.
2. How do I troubleshoot a lawn mower that won’t start?
Start with simple checks:
- Fuel: Empty the old gas tank and refill with fresh gasoline.
- Battery: Check the battery terminals for corrosion and clean them. If needed, jump-start the mower or replace the battery.
- Spark Plug: Inspect the spark plug for fouling or corrosion. Clean or replace it if necessary.
- Air Filter: Ensure the air filter is clean and not blocked.
3. What kind of gas should I use in my lawn mower?
Use fresh, unleaded gasoline with an octane rating of 87 or higher. Avoid using gasoline with ethanol, as it can attract moisture and cause problems over time.
4. Is it necessary to add fuel stabilizer to my lawn mower gas?
Yes, fuel stabilizer helps prevent the gasoline from breaking down and forming deposits in the engine. It’s recommended to add stabilizer to the gas tank before storing your lawn mower for the winter.
5. Should I change the oil in my lawn mower after winter?
Yes, it’s good practice to change the oil in your lawn mower before starting it up for the first time after winter. Old oil can be thick and not flow properly, leading to engine problems.
6. What can I do to prevent lawn mower problems in the future?
Proper maintenance is key.
- Before storage: Clean the mower thoroughly, drain the old gas, add fuel stabilizer, and change the oil.
- During storage: Store the mower in a dry, clean place.
- Regular maintenance: Check the battery, spark plug, air filter, and oil regularly.
7. When should I bring my lawn mower to a mechanic?
If you’ve tried troubleshooting the basic issues and your lawn mower still won’t start, it’s best to bring it to a qualified mechanic. They can diagnose more complex problems and perform necessary repairs.