Discover the Secret to a Smooth Ride: How to Test Husqvarna Ignition Coil

If your Husqvarna lawnmower, chainsaw, or other equipment isn’t firing up, a faulty ignition coil could be the culprit. Learning how to test a Husqvarna ignition coil is a valuable skill for any DIY mechanic, saving you time and money in the long run. This guide will walk you through the process, step-by-step, so you can diagnose the problem and get your equipment back in action.

Understanding the Ignition Coil’s Role

The ignition coil is a vital component in your Husqvarna’s ignition system. It’s responsible for transforming the low-voltage electrical signal from the ignition module into a high-voltage spark that ignites the fuel-air mixture in the combustion chamber. Without a functioning ignition coil, your engine won‘t even attempt to start.

Common Signs of a Faulty Ignition Coil

Before diving into testing, it’s helpful to recognize the common symptoms of a failing ignition coil:

• No spark: The most obvious sign is the lack of a spark at the spark plug.
• Engine misfires: If the spark is weak or intermittent, you’ll likely experience misfires, causing the engine to run rough or stall.
• Difficulty starting: A faulty ignition coil can make it difficult to start the engine, requiring multiple attempts or extended cranking.
• Engine dies suddenly: If the ignition coil fails completely, the engine will suddenly stop running.

Gathering the Necessary Tools

Testing an ignition coil requires a few basic tools:

• Multimeter: A digital multimeter is essential for measuring voltage and resistance.
• Spark plug wrench: You’ll need this to remove and inspect the spark plug.
• Wire connectors: These are helpful for making temporary connections during testing.
• Safety glasses: Always protect your eyes when working with electrical components.

Step-by-Step Instructions for Testing the Ignition Coil

Now let’s walk through the testing process:

1. Disconnect the Ignition Coil: Locate the ignition coil on your Husqvarna equipment. It’s usually a black cylindrical component with a wire lead connected to the spark plug. Disconnect the wire lead by gently pulling it off the coil terminal.
2. Check for Continuity: Set your multimeter to the resistance setting (usually ohms). Connect one multimeter lead to the coil’s primary terminal (usually the larger terminal) and the other lead to the coil’s secondary terminal (usually the smaller terminal). The multimeter should show a resistance reading within the manufacturer’s specified range. If the reading is infinite or outside the range, the coil is likely faulty.
3. Check for Ground Continuity: Set your multimeter to the resistance setting again. Connect one lead to the coil’s ground terminal (usually a metal tab or bracket) and the other lead to a known good ground point on the engine. You should get a very low resistance reading, close to zero ohms. If the reading is high, there’s a problem with the ground connection, which can also affect spark generation.
4. Test Spark Output (Optional): If you have a spark tester, you can further confirm the coil’s functionality. Connect the spark tester to the spark plug wire and crank the engine. A strong blue spark should jump across the tester’s gap. If there’s no spark, the ignition coil is likely faulty.

Troubleshooting Common Issues

If your testing reveals issues with the ignition coil, here are some possible causes and solutions:

• Burnt or Corroded Terminals: Inspect the terminals on the ignition coil for signs of burning or corrosion. Clean them with a wire brush or sandpaper to improve conductivity.
• Loose Connections: Ensure all connections to the ignition coil are secure and tight. Loose connections can disrupt the flow of electricity.
• Damaged Wiring: Check the wiring leading to and from the ignition coil for any breaks, frays, or exposed wires. Repair or replace damaged wiring as needed.

Beyond the Ignition Coil: Other Potential Causes

While the ignition coil is a common culprit for starting problems, remember that other issues can also contribute to a no-spark condition:

• Faulty Spark Plug: Inspect the spark plug for wear, damage, or fouling. Replace it if necessary.
• Defective Ignition Module: The ignition module controls the timing and duration of the spark. If it’s faulty, it can prevent the ignition coil from receiving the proper signal.
• Broken or Corroded Wires: Check all wiring in the ignition system for breaks, corrosion, or loose connections.
• Low Battery: A weak battery can’t provide enough power to the ignition system.

Final Thoughts: Getting Your Husqvarna Back in Action

Testing an ignition coil is a straightforward process that can save you from unnecessary repairs. By following these steps and troubleshooting any issues you encounter, you’ll be well on your way to diagnosing and fixing the problem. Remember, if you’re unsure about any part of the process, consult a qualified mechanic for assistance.

Popular Questions

Q: What is the typical lifespan of an ignition coil?

A: Ignition coils generally last for several years, but factors like engine wear, environmental conditions, and usage patterns can affect their lifespan.

Q: Can I use a generic ignition coil for my Husqvarna equipment?

A: It’s best to use a genuine Husqvarna replacement coil or a compatible coil from a reputable aftermarket supplier. Using a generic coil might not provide the correct specifications or performance.

Q: What if I find a short circuit in the ignition coil wiring?

A: If you find a short circuit, it’s crucial to isolate and repair it before attempting to start the engine. Short circuits can damage electrical components or even cause a fire.

Q: Can I test the ignition coil while it’s still connected to the engine?

A: While it’s possible to test the coil while it’s connected, it’s generally safer and easier to disconnect it for testing. This ensures accurate results and prevents potential damage to other components.