How to Check a Lawn Mower Coil for Spark – A Comprehensive Guide
As a lawn care enthusiast, I know how frustrating it can be when your trusty lawn mower refuses to start. One common culprit? A faulty ignition coil. But don’t worry, checking the coil for a spark is a relatively straightforward process that you can do yourself. In this comprehensive guide, I’ll walk you through the steps to diagnose and troubleshoot your lawn mower’s ignition coil, so you can get back to a perfectly manicured lawn in no time.
Understanding the Role of the Ignition Coil
The ignition coil is a critical component in the ignition system of your lawn mower. Its primary function is to provide the high-voltage spark that ignites the fuel-air mixture in the engine’s cylinders, allowing the engine to start and run. When the coil is working properly, it takes the low-voltage current from the battery or magneto and transforms it into the high-voltage spark needed to fire the spark plugs.
Symptoms of a Faulty Ignition Coil
Before we dive into the steps to check the coil, it’s important to understand the common signs that your lawn mower’s ignition coil may be on its way out. Some telltale symptoms include:
- Engine won’t start or is difficult to start
- Engine runs rough or stalls unexpectedly
- Engine lacks power or runs at lower RPMs
- Lawn mower emits a clicking or popping noise
If you’ve noticed any of these issues with your lawn mower, it’s a good idea to check the ignition coil for proper functioning.
Tools Needed to Check the Lawn Mower Coil
Before you get started, make sure you have the following tools on hand:
- Multimeter or spark tester
- Screwdrivers (flathead and Phillips head)
- Wrench or socket set
- Safety glasses
Step-by-Step Guide to Checking the Lawn Mower Coil
1. Locate the Ignition Coil
The first step is to locate the ignition coil on your lawn mower. It’s typically located near the engine, often mounted on the side or top of the engine block. Refer to your lawn mower’s owner’s manual if you’re unsure of its exact location.
2. Disconnect the Spark Plug Wire
Once you’ve found the ignition coil, disconnect the spark plug wire from the spark plug. This will allow you to safely test the coil without the risk of electrical shock.
3. Inspect the Coil for Visible Damage
Visually inspect the ignition coil for any signs of physical damage, such as cracks, burns, or loose connections. If you notice any obvious issues, it’s likely time to replace the coil.
4. Test the Coil for Spark
Now, it’s time to test the coil for a spark. There are a few ways to do this:
Using a Multimeter
Set your multimeter to the “Ohms” setting and touch the two probes to the terminals on the ignition coil. You should see a reading of between 3 and 30 ohms, which indicates a properly functioning coil. If the reading is outside of this range or the multimeter shows an open circuit, the coil is likely faulty and needs to be replaced.
Using a Spark Tester
Attach the spark tester to the spark plug wire and hold the tester close to a metal part of the engine. Crank the engine and watch for a bright blue spark. If you don’t see a spark, the coil is likely the problem and should be replaced.
5. Check the Coil’s Connections
If the coil appears to be functioning properly, the next step is to check the connections. Ensure that the wires leading to the coil are securely connected and not damaged. Also, check the ground connection to make sure it’s clean and tight.
Conclusion
Checking your lawn mower’s ignition coil for spark is a straightforward task that can save you time and money. By following the steps outlined in this guide, you’ll be able to diagnose and troubleshoot any issues with your coil, getting your lawn mower back in working order in no time. Remember, safety should always be your top priority, so be sure to wear protective gear and follow all manufacturer instructions. Happy mowing!
FAQs
1. How often should I check my lawn mower’s ignition coil?
As a general rule, it’s a good idea to check the ignition coil as part of your regular lawn mower maintenance routine, typically at the start of each mowing season. However, if you notice any issues with your lawn mower’s performance, it’s a good idea to check the coil as soon as possible.
2. Can a bad ignition coil cause a lawn mower to not start?
Yes, a faulty ignition coil is one of the most common reasons a lawn mower won’t start. If the coil is not generating a strong enough spark, the engine won’t be able to ignite the fuel-air mixture and start running.
3. How much does it cost to replace a lawn mower ignition coil?
The cost to replace a lawn mower ignition coil can vary depending on the make and model of your lawn mower, but you can generally expect to pay between $30 and $100 for a new coil. It’s a relatively inexpensive repair, especially compared to the cost of a new lawn mower.
4. Can I test a lawn mower ignition coil without removing it?
Yes, you can often test the ignition coil without having to remove it from the lawn mower. As long as you can access the spark plug wire and a metal ground on the engine, you can use a spark tester to check for a proper spark.
5. How do I know if my lawn mower ignition coil is bad?
The most common signs of a bad ignition coil include a lawn mower that’s difficult to start, runs rough, lacks power, or stalls unexpectedly. If you notice any of these issues, it’s a good idea to test the coil as outlined in this guide.
