How to test ignition coil on leaf blower?

Having a leaf blower in your home is always of great use. They have multiple uses rather than cleaning leaves. We might have faced the issue when suddenly our leaf blower stops working. The major reason behind this would be an ignition coil related issue. When your blower suddenly misbehaves or stops working it’s better to check the ignition coil which would certainly give you some idea. Here we are going to have a look at how we can test a leaf blower. 

What is an ignition coil in a leaf blower?

An ignition coil is a small component in the engine of a leaf blower. It connects the spark plug with the flywheel that rotates when the leaf blower is turned on through a starter cord. All three components (flywheel, spark plug, and ignition coil) are found in the engine. The starter is located on the outside part of a leaf blower. For the electric one, the starter is like a switch button, while for the Gas Powered Backpack Leaf Blower, it is a cord that is pulled to power on the leaf blower.

The ignition coil in a leaf blower is usually covered near the motor system but can be seen clearly once the cover is taken off the motor. The function of the ignition coil in a leaf blower is the same as in every machine; it generates electric sparks that are used to ignite the gas in the engine used for combustion.

How does an ignition coil work?

The ignition coil consists of an insulated wire that leads from the tip of the spark plug to a metal armature at the other end, which is mounted to the engine frame near the flywheel. The armature essentially consists of two hidden coils of copper wire that generate electricity when magnets along the outer edge of the flywheel whiz by the coils at high speed. When you pull the cord on a manual start, you are generating the initial electrical current that can jump the gap in the spark plug and start the engine turning. On an electric start motor, a battery-operated starter spins the flywheel. Either way, once the engine is started, the flywheel keeps turning, creating a self-perpetuated ignition cycle. This is the basic working principle of the ignition coil could be like this.

Why should you test the ignition coil on a leaf blower?

We may all have the doubt on why we should bother in testing the ignition coil. The answer is simple, testing the ignition coil works just like troubleshooting. We could find out what all problems are there for the leaf blower without much effort. And if the test shows that the ignition coil is working correctly, but the leaf blower still does not start, then you should focus on other parts as well. 

How to test the ignition coil?

Testing an ignition coil has different methods. The ignition coil itself is a step-up transformer containing a primary and secondary coil. These coils boost magneto voltage high enough to ignite the fuel/air mixture in the cylinder by jumping the gap between the spark plug electrodes. We can check the steps to test the ignition coil.

Remove the spark plug– The primary step in testing an ignition coil is removing the spark plug lead. This could be done by pulling the rubber boot attached to the plug.

Press the alligator clip to spark plug- The ignition tester consists of an alligator plug. We should apparently clamp the alligator clip on the ignition tester to the spark plug and insert the other end of the tester into the connector inside the rubber boot.

Pull the starter rope- Once the attachment is completed, the starter rope should be pulled. Caution must be there while doing this as staying close to the ignition tester could cause shock.

Pay attention to the window– Pay close attention to the transparent window of the ignition tester while pulling the starter rope. If you see a bright blue spark jump across the terminals in the tester window and the engine starts, both the ignition coil and spark plug are in working order. If not, go to the next step.

Remove the clip attached to spark plug-  Then next step is to remove the alligator clip from the spark plug and clamp it onto a bolt on the leaf blower’s cylinder head. Pull the starter rope; if you see a bright blue spark jump across the tester window, the spark plug is defective and must be replaced. If there is still no spark, either the coil itself has burned out, or the plug lead is defective.

Replace the plug and Retest- This is the final step in testing the ignition coil on a leaf blower. The plug should be replaced and we should retest it once again.  If you do not see a spark jump the gap, the coil is defective and must be replaced. With all that done, you can now start your leaf blower and see if it is working. Given that you have followed all these steps diligently, your leaf blower should start and run smoothly.


Hope now everyone is aware of how to test the ignition coil. There may be other procedures in testing the ignition coil, but we found this method quite simple and effective. To keep your leaf blower in a proper working condition it’s better to have occasional testing. This helps to find the faults associated with the coil and helps to keep the leaf blower safe. In the beginning, you may find it quite difficult, but soon you will catch up with it. Do let us know your reviews!