If you’re having issues starting your lawnmower you need to check your spark park because bad spark plugs are the primary cause of such an issue. And if you don’t know how to check them, worry not! We’re going to give you an ultimate guide on how to check if lawn mower spark plug is firing or not.
The spark plug is a vital component of the engine that provides ignition to the combustion chamber of the engine by mixing an accurate ratio of fuel and air through an electric spark.
In this article, we will provide you with a proper guide to check the spark plug fire and will give tips to maintain it.
Table of Contents
How To Check If Lawn Mower Spark Plug Is Firing
This guide will provide you with the instructions about:
- with a spark plug tester
- with a screwdriver
- without any tool
1. How To Check If Lawn Mower Spark Plug Is Firing With A Spark Plug Tester
A spark plug tester is a convenient and secure way to check plug ignition spark. You can consider an inductive ignition tester one of the most efficient tools to identify the issues regarding spark plug.
The first turn of the plug tester powers the battery while the other one connects to the ignition coil and the battery by disconnecting the plug from the engine.
- Turn the engine off and make sure to disengage all the electric supplies.
- Remove the engine cover by lifting it.
- Locate the exact location of the spark plug in the engine to disconnect it.
- Pull the ignition coil to remove it from the spark plug and ground the plug by attaching it with the metal surface of the engine.
- Replace spark plug with the ignition tester and make sure to ground the tester by connecting it with the metal covering.
- Connect the tester in between the spark plug and the ignition coil by connecting its one end with the ignition coil and the other one with the spark plug.
- Turn on the ignition by starting the engine.
- If you can see the fire or a spark in the tester while starting the engine, then you have no issues with the spark plug, and you are getting a spark.
- If the tester is out of fire or spark, then you need a spark plug replacement.
2. How To Check If Lawn Mower Spark Plug Is Firing With A Screwdriver
A screwdriver is a quite quick way to test if the spark plug is firing or not. It’s how you can check for the fire spark using a screwdriver or screwdriver test light;
- Remove the engine lid and locate the spark plug.
- Check for the ignition coil and pop it off from the spark plug.
- Stick a screwdriver inside the ignition coil.
- Then bring this coil and screwdriver close to the engine while keeping your engine ground.
- Get close about half of a quarter inch and crank the engine.
- If your ignition system is working well, then you should feel a zapping over the screwdriver.
- If you are not feeling anything, then you need to replace the spark plug.
3. How To Check If Lawn Mower Spark Plug Is Firing Without Any Tool
Another alternative to check the spark plug fire if you have a situation of no tools, then you can go with this method to test the spark.
This is how it works;
- You need to remove the spark plug from the engine.
- Reconnect it with the ignition coil or the spark plug coil.
- Ground the spark plug by attaching the threaded part of the plug with the metal surface of the engine.
- Make sure to unplug the fuel pump connection and supply from the engine.
- Start the engine to check the spark plug firing.
- If the plug is functioning correctly, then you will be able to see a spark at the tip of the plug. Otherwise, you have a damaged or failed spark plug.
Strength Of The Spark
The color of the spark or fire determines the spark strength.
Red, Yellow, Or Orange Spark – Weak Spark
- A red, yellow, or orange-colored spark is considerably weak.
- It may not be capable of sparking under the cylindrical pressure.
Blue, Purple, Or White Spark – Strong Spark
- A blue, purple, or white spark is the best and powerful spark.
- It is strong enough to support the efficiently working engine within the cylindrical pressure.
Important Instructions – How To Check If Lawn Mower Spark Plug Is Firing
- Keep your hands off of the coil and the tester while checking for the spark.
- Spark plug fire testing with a screwdriver is not secure and safe.
- Screwdriver is a dirty and highly not recommended method of spark testing.
- Keep your hands off from the engine and machine while starting the engine to prevent any injury because of high voltage.
- Make sure to have a backup battery source while checking for the firing spark plug.
- You can use a soft wire brush to clean the spark plug.
- Avoid using blaster for spark plug cleaning purposes.
- Make sure to check and replace the spark plug as needed after some duration to keep lawnmower efficient.
Spark plug cleaning and maintenance is an essential part of engine maintenance. It keeps your lawnmower efficient, reliable, and long-lasting.
Hopefully, by following this guide, you will able to check, maintain, and can replace the spark plug at home without any issues. And now you will be able to test that How To Check If Lawn Mower Spark Plug Is Firing or not at home.