Quick notes
- This blog post will provide a comprehensive guide on how to test an ignition coil on a chainsaw, empowering you to diagnose and resolve ignition issues effectively.
- An ignition coil is an essential component of a chainsaw’s ignition system, responsible for generating the high-voltage spark required to ignite the air-fuel mixture in the engine.
- Connect the red probe of the multimeter to the terminal on the ignition coil where the spark plug wire connects.
If your chainsaw is experiencing ignition problems, it’s crucial to determine the root cause to ensure a swift repair. One of the most common culprits is a faulty ignition coil. This blog post will provide a comprehensive guide on how to test an ignition coil on a chainsaw, empowering you to diagnose and resolve ignition issues effectively.
What is an Ignition Coil?
An ignition coil is an essential component of a chainsaw’s ignition system, responsible for generating the high-voltage spark required to ignite the air-fuel mixture in the engine. It consists of two coils: the primary coil, which receives low-voltage from the battery, and the secondary coil, which produces the high-voltage spark.
Symptoms of a Faulty Ignition Coil
Several signs can indicate a faulty ignition coil in a chainsaw:
- Engine fails to start or stalls intermittently
- Weak or no spark at the spark plug
- Loss of power or reduced engine performance
- Engine backfires or runs erratically
Safety Precautions
Before testing the ignition coil, always follow these safety precautions:
- Wear appropriate safety gear, including gloves and eye protection.
- Disconnect the spark plug wire from the spark plug to prevent electrical shock.
- Allow the engine to cool down before testing.
- Keep flammable materials away from the work area.
Tools Required
To test the ignition coil, you will need:
- Multimeter
- Spark plug wrench
- Screwdriver
Step-by-Step Testing Procedure
1. Remove the Spark Plug
Using a spark plug wrench, carefully remove the spark plug from the engine. Inspect the spark plug for signs of damage or excessive wear.
2. Connect the Multimeter
Set the multimeter to the ohms (Ω) setting. Connect the red probe of the multimeter to the terminal on the ignition coil where the spark plug wire connects. Connect the black probe to the engine’s ground.
3. Measure Primary Coil Resistance
Check the multimeter reading. The primary coil resistance should typically range from 0.1 to 1.5 ohms. If the resistance is significantly higher or lower than these values, it indicates a faulty primary coil.
4. Disconnect the Ignition Coil
Disconnect the ignition coil from the engine by removing the mounting screws. Note the orientation of the wires for reassembly.
5. Measure Secondary Coil Resistance
Set the multimeter to the kilohms (kΩ) setting. Connect the red probe to the terminal on the ignition coil where the secondary wire connects. Connect the black probe to the ignition coil body.
6. Check Secondary Coil Resistance
The secondary coil resistance should typically range from 7 to 15 kΩ. If the resistance is significantly higher or lower than these values, it indicates a faulty secondary coil.
7. Test for Spark
Reattach the spark plug wire to the spark plug. Hold the spark plug against the engine block using insulated pliers. Pull the starter cord or press the starter button. Observe the spark plug gap for a strong, blue spark. If there is no spark or a weak spark, it indicates a faulty ignition coil.
Troubleshooting
If the test results indicate a faulty ignition coil, you may need to replace it. Before doing so, check the following:
- Ensure that the spark plug is properly gapped and in good condition.
- Inspect the spark plug wire for damage or loose connections.
- Check the flywheel key for wear or damage.
How to Replace an Ignition Coil
If the ignition coil needs to be replaced, follow these steps:
- Disconnect the spark plug wire and remove the mounting screws.
- Disconnect the ignition coil from the engine.
- Install the new ignition coil and tighten the mounting screws.
- Reconnect the spark plug wire.
Wrapping Up
Testing the ignition coil on a chainsaw is a relatively simple procedure that can help you diagnose ignition problems effectively. By following the steps outlined in this guide, you can accurately determine whether the ignition coil is faulty and take the necessary steps to repair or replace it. Remember to always prioritize safety and consult a professional if you encounter any difficulties during the testing or repair process.
Frequently Asked Questions
1. What are the signs of a faulty ignition coil in a chainsaw?
Symptoms of a faulty ignition coil include engine failure to start, weak or no spark at the spark plug, loss of power, and engine backfires.
2. Can I test the ignition coil without a multimeter?
Yes, you can test the ignition coil using a spark tester. However, a multimeter provides more accurate measurements and can detect both primary and secondary coil faults.
3. How often should I replace the ignition coil in my chainsaw?
The lifespan of an ignition coil varies depending on usage and maintenance. It is recommended to replace it every 2-3 years or when it shows signs of failure.
