The rumble of your lawnmower is a familiar summer sound. But what happens when that rumble turns into a sputtering, coughing, or complete silence? A faulty ignition coil could be the culprit!
This article will guide you through the common symptoms of a bad ignition coil, explain how this vital component works, and provide tips on testing it yourself. We’ll also explore the potential consequences of ignoring a failing coil and offer advice on replacing it when necessary.
Understanding the Ignition Coil
The ignition coil acts as the heart of your lawnmower’s ignition system. It’s responsible for transforming the low voltage electricity from your battery into high voltage electricity needed to spark the spark plug and ignite the fuel-air mixture in the combustion chamber.
Common Signs of a Bad Ignition Coil
A malfunctioning ignition coil can lead to various frustrating symptoms. Here’s what to look for:
H2: The Engine Won’t Start
This is the most obvious sign of a bad ignition coil. Without the high-voltage spark to ignite the fuel, your lawnmower won’t even attempt to start.
H3: Spark Plug Testing
To confirm if the coil is the problem, you can test the spark plug. Remove the spark plug and connect a spark plug tester to it. Ground the tester to the engine block. Crank the engine and observe the tester. If there’s no spark, the ignition coil might be faulty.
H2: Engine Misfiring or Running Roughly
A weak or intermittent spark from a failing coil can lead to engine misfiring. This causes the engine to run roughly, jerk, or sputter, leading to a decrease in power and potentially damaging the engine.
H3: Checking for Spark
You can observe the spark plug while the engine is running. If the spark appears weak, intermittent, or missing entirely, it could indicate a faulty ignition coil.
H2: The Engine Dies While Running
If your lawnmower suddenly stalls or shuts off while you’re mowing, a faulty ignition coil could be to blame. The coil might be failing intermittently, causing the engine to lose power and stop running.
H3: Diagnosing the Issue
Consider checking other parts of the ignition system before concluding it’s the coil, such as the spark plug, spark plug wires, and kill switch.
H2: Why Does an Ignition Coil Fail?
Ignition coils are typically durable components, but they can fail over time due to:
H3: Wear and Tear
Years of exposure to heat, vibration, and moisture can degrade the coil’s internal components, causing it to malfunction.
H3: Electrical Problems
Voltage spikes or fluctuations in the electrical system can damage the coil’s windings, leading to a failure.
H2: Consequences of Ignoring a Bad Ignition Coil
Ignoring a bad ignition coil can lead to further problems:
H3: Reduced Engine Performance: Misfiring or a complete lack of ignition will significantly reduce engine power and efficiency.
H3: Engine Damage: Prolonged misfiring can damage the engine’s valves and pistons due to incomplete combustion and excessive heat.
H3: Environmental Issues: Unburnt fuel can lead to increased emissions, harming the environment.
H2: Replacing the Ignition Coil
Replacing a bad ignition coil is generally a straightforward process, although the complexity can vary depending on the mower model.
H3: Steps Involved
- Disconnect the Battery: To avoid electrical shocks, disconnect the battery’s negative terminal.
- Locate the Ignition Coil: The coil is typically mounted near the spark plug and is easily identifiable by its black rubber boot connected to the spark plug wire.
- Disconnect the Wires: Disconnect the wire from the coil and remove the spark plug wire from the spark plug.
- Remove the Coil: Depending on the model, the coil may be held in place with screws or clips. Carefully remove the coil.
- Install the New Coil: Ensure the new coil is compatible with your lawnmower model. Install it in the same position as the old one, securing it with the original hardware.
- Reconnect the Wires: Reattach the wire to the coil and connect the spark plug wire to the spark plug.
- Reconnect the Battery: Reconnect the battery terminal.
H2: Troubleshooting Tips
- Check the Ignition Switch: Ensure the ignition switch is functioning correctly.
- Inspect the Spark Plug Wires: Look for cracks, cuts, or corrosion in the spark plug wires.
- Test the Fuel System: Verify that fuel is reaching the carburetor.
H2: Conclusion
A faulty ignition coil can bring your lawnmower to a standstill, but understanding the symptoms and knowing how to test the coil can help you diagnose the problem and get back to enjoying your manicured lawn. If you’re unsure about replacing the coil yourself, consult a qualified mechanic. Remember, maintaining your lawnmower’s ignition system is essential for its performance and longevity.
FAQ
1. What is a lawn mower coil?
A lawn mower coil is a vital component of your lawn mower’s ignition system. It transforms low-voltage current from the battery into high-voltage current, which is necessary to create a spark plug. This spark plug ignites the fuel-air mixture in the engine, allowing it to run. Without a functioning coil, your lawn mower won’t start.
Imagine your lawn mower as a car; the coil is the spark plug’s power source, enabling it to ignite the fuel and make the engine roar to life.
2. What are the signs of a failing lawn mower coil?
Several signs can indicate a failing lawn mower coil. The most common is difficulty starting the lawn mower, which might involve the engine turning over but not catching. You may also notice inconsistent engine performance, such as sputtering or dying. Another telltale sign is a lack of spark at the spark plug, even if the engine is turning over.
If your lawn mower is exhibiting any of these symptoms, it’s a good idea to check the coil. If it is the culprit, replacing it can fix the problem and get you back to mowing your lawn smoothly.
3. How do I test my lawn mower coil?
Testing your lawn mower coil requires a basic understanding of electrical circuits and some simple tools. You’ll need a multimeter, a screwdriver, and a spark plug wire. Disconnect the spark plug wire from the spark plug and then connect the multimeter to the coil’s terminals. With the ignition switch turned on, the multimeter should read a certain resistance value. If the reading is outside of the manufacturer’s specifications, your coil is likely faulty.
If you’re uncomfortable with electrical testing, it’s always best to seek professional help from a qualified mechanic.
4. How do I replace a lawn mower coil?
Replacing a lawn mower coil is a relatively straightforward process. First, disconnect the spark plug wire from the coil and the battery. Then, locate the coil, usually near the engine block or on the engine cover. Unplug the electrical connections to the coil and use a wrench to remove the mounting bolts. Install the new coil by reversing these steps, ensuring that the electrical connections are secure.
Always refer to your lawn mower’s manual for specific instructions and warnings related to your model.
5. How long does a lawn mower coil typically last?
The lifespan of a lawn mower coil varies depending on factors such as usage, maintenance, and environmental conditions. However, a well-maintained coil can last for several years, sometimes even a decade or more.
Proper maintenance, including cleaning the coil and its surrounding area, can extend its life. Exposure to moisture, extreme temperatures, or vibrations can negatively impact the coil’s lifespan.
6. Can I replace a lawn mower coil myself?
Replacing a lawn mower coil is a task that many DIYers can handle. However, it requires some basic electrical knowledge and mechanical skills. If you’re unsure about your capabilities, it’s always best to consult a qualified mechanic.
For most models, the replacement process is fairly simple. However, certain models might have more complex installations or require specialized tools. If you’re unsure about your ability, seeking professional help is always the safest option.
7. Where can I buy a new lawn mower coil?
You can find new lawn mower coils at many places, including online retailers like Amazon, specialty hardware stores, and auto parts stores. When purchasing a new coil, ensure it is compatible with your lawn mower model. The coil’s specifications, such as resistance values, should match those of your current coil.
It’s crucial to purchase a genuine replacement coil or one manufactured by a reputable brand to ensure proper performance and longevity.