Explosive Results: How to Test Ignition Coil Chainsaw Like a Pro

A chainsaw is a powerful tool that can be incredibly useful for a variety of tasks, from cutting firewood to clearing brush. However, like any piece of machinery, it can also experience problems. One common issue is a faulty ignition coil, which can prevent the engine from starting or running properly. Knowing how to test ignition coil chainsaw can save you time and money, allowing you to diagnose and potentially fix the issue yourself. This guide will walk you through the process step-by-step, providing you with the knowledge and confidence to tackle this common chainsaw problem.

Understanding the Ignition Coil

The ignition coil is a vital component in your chainsaw’s ignition system. It’s responsible for generating a high-voltage spark that ignites the fuel-air mixture in the combustion chamber, allowing the engine to run. When the ignition coil malfunctions, the spark can be weak or absent, leading to starting problems, misfires, or even a complete engine failure.

Symptoms of a Faulty Ignition Coil

Before jumping into testing, it’s essential to identify the signs of a faulty ignition coil. Some common symptoms include:

• Difficulty starting: The chainsaw might crank but fail to ignite.
• Misfiring: The engine may sputter, run rough, or stall intermittently.
• No spark: If you can’t get a spark at the spark plug, the ignition coil is likely the culprit.
• Weak spark: A weak spark can also be a sign of a failing ignition coil.

Tools and Materials

To test your chainsaw’s ignition coil, you’ll need a few basic tools and materials:

• Multimeter: A multimeter is an essential tool for diagnosing electrical issues. You’ll need one that can measure both resistance and voltage.
• Spark plug wrench: This tool is used to remove and install the spark plug.
• Spark plug tester: This device allows you to visually inspect the spark from the ignition coil.
• Safety glasses: Always wear safety glasses when working with tools and machinery.
• Gloves: Protect your hands from potential hazards.

Testing the Ignition Coil Resistance

The first step in testing your ignition coil is to check its resistance. This will help you determine if the coil is internally shorted or open.

1. Disconnect the spark plug wire: Carefully detach the spark plug wire from the ignition coil.
2. Set the multimeter to the ohms setting: Select the appropriate resistance range on your multimeter, usually between 0 and 20k ohms.
3. Connect the multimeter leads: Connect one lead of the multimeter to the spark plug wire terminal on the ignition coil and the other lead to the coil’s ground terminal.
4. Read the resistance: The resistance reading should fall within the manufacturer’s specifications. If the reading is outside the specified range, the ignition coil is likely faulty.

Testing the Ignition Coil Output

If the resistance test shows that the ignition coil is working, you’ll need to test its output voltage to confirm that it’s generating the necessary spark.

1. Connect the spark plug: Reinstall the spark plug back into the cylinder head.
2. Connect the spark plug wire: Reconnect the spark plug wire to the ignition coil.
3. Set the multimeter to the AC voltage setting: Select a suitable AC voltage range on your multimeter, usually around 200V.
4. Connect the multimeter leads: Connect one lead of the multimeter to the spark plug wire terminal on the ignition coil and the other lead to a good ground.
5. Crank the engine: While holding the spark plug wire near a grounded metal surface, crank the engine over.
6. Observe the voltage reading: The multimeter should display a significant AC voltage reading, typically around 10,000 volts or more. If the voltage reading is low or absent, the ignition coil is likely faulty.

Troubleshooting and Replacing the Ignition Coil

If your tests indicate a faulty ignition coil, it needs to be replaced. Here’s a quick guide to replacing the ignition coil:

1. Disconnect the spark plug wire: Remove the spark plug wire from the ignition coil.
2. Remove the ignition coil: Locate the ignition coil on your chainsaw, usually near the spark plug. It may be secured with screws or clamps. Carefully remove the coil from its mounting location.
3. Install the new ignition coil: Install the new ignition coil in the same position as the old one, ensuring that it’s properly secured.
4. Reconnect the spark plug wire: Connect the spark plug wire to the new ignition coil.
5. Test the new ignition coil: After installing the new ignition coil, repeat the tests mentioned above to ensure it’s functioning correctly.

Safety Tips for Testing and Replacing the Ignition Coil

• Always disconnect the battery: Before performing any electrical work on your chainsaw, disconnect the battery to prevent electrical shock.
• Wear safety glasses and gloves: Protect your eyes and hands from potential hazards.
• Be careful with the spark plug wire: Avoid touching the spark plug wire terminal while the engine is running.
• Avoid touching exposed terminals: Be cautious when working with electrical components.

Final Thoughts: Preventing Future Ignition Coil Issues

While diagnosing and replacing a faulty ignition coil can be a DIY project, it’s essential to understand the potential causes behind the failure. Here are some tips to prevent future ignition coil issues:

• Use high-quality fuel: Use the recommended fuel mixture for your chainsaw.
• Regularly maintain the air filter: A clean air filter ensures proper airflow to the engine.
• Keep the spark plug clean and gapped correctly: A clean and properly gapped spark plug ensures optimal ignition.
• Avoid running the chainsaw in extreme conditions: Excessive heat or cold can negatively impact the ignition coil.

Frequently Discussed Topics

Q: What is the lifespan of a chainsaw ignition coil?

A: The lifespan of a chainsaw ignition coil varies depending on factors such as usage, maintenance, and environmental conditions. However, they generally last for several years with proper care.

Q: Can I use a different type of ignition coil on my chainsaw?

A: It’s crucial to use a replacement ignition coil that’s specifically designed for your chainsaw model. Using an incompatible coil can lead to performance issues or even damage to the engine.

Q: Can I test the ignition coil without a spark plug tester?

A: While a spark plug tester provides a visual confirmation of the spark, you can test the ignition coil output using a multimeter. However, you’ll need to hold the spark plug wire near a grounded metal surface to observe the spark.

Q: What are some other common chainsaw problems that might mimic ignition coil issues?

A: Other problems that can cause starting or running issues include a faulty spark plug, clogged carburetor, fuel filter blockage, or a dead battery. It’s essential to troubleshoot these components if the ignition coil test is inconclusive.

By following these steps and understanding the basics of chainsaw ignition systems, you’ll be equipped to diagnose and potentially fix a faulty ignition coil yourself. Remember to always prioritize safety and use the appropriate tools and materials. With a little knowledge and effort, you’ll be back to cutting wood in no time!