Quick and simple steps to replace snowblower spark plugs

Spark plugs might be small, but they ignite the fuel-air mixture that powers the engine, so if the spark plug is worn out or faulty, you might find yourself stuck in the snow with a machine that won’t start.

The good news is that replacing a spark plug is a simple DIY task that doesn’t take much time or effort. In this guide, we’ll walk you through the quick and easy steps to get your snow blower’s spark plug swapped out and ready to go.

The info in this article might not match your exact appliance model. While we try to give helpful advice for all sorts of DIY repairs, different models can have varying troubleshooting steps, error codes, part replacements, etc. For the most accurate guidance, we recommend checking your manufacturer’s documentation or getting in touch with us if you have any questions.

Why replacing the spark plug matters

The spark plug is key to igniting the fuel-air mix in your snow blower’s engine. Over time, it can wear down, leading to sluggish performance, tougher starts, and wasting fuel. Regular upkeep, like replacing the spark plug, makes sure your snow blower runs smoothly throughout the winter.

When to replace your snow blower’s spark plug

Generally, you should change the spark plug every 100 hours of use or at least once a season. Doing so helps prevent engine troubles and keeps your snow blower working great.

What you’ll need

• New spark plug (check your owner’s manual for the right type)
• Spark plug socket and ratchet
• Spark plug gap gauge
• Clean cloth or compressed air
• Gloves

Read more: Snow blower won’t shift: A troubleshooting guide

Safety precautions   

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind: 

• If working indoors, make sure there is adequate ventilation to prevent the buildup of exhaust fumes. Carbon monoxide poisoning can be a serious risk.
• Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.
• Never attempt to service or repair while it is running or when the engine is still warm. Wait for all moving parts to come to a complete stop.
• Exercise extreme caution when working near blades, augers, or any other moving parts. Keep your hands, fingers, and clothing clear of these areas at all times.
• If the appliance has recently been used, give it plenty of time for any hot parts to cool down before working on it. 
• Empty the gas tank before beginning any work. Refill using fresh fuel. 
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Take your time and don’t rush while working to prevent accidents and personal injuries.
• Work in a well-lit area so you can clearly see and access the interior parts.
• Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.
• Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury. 
• When not in use, store the machine in a safe and dry location.

Read more: Snowblower chute won’t turn: A troubleshooting guide

1. Removal and testing steps

1. The spark plug is usually positioned on the engine, with the disconnected spark plug wire attached to it. If you’re unsure, consult your user manual for its exact location.
2. Use a spark plug socket or a socket wrench to loosen the spark plug. Turn it counterclockwise until you can easily pull it out.
3. Check the spark plug for signs of wear, such as a blackened tip, corrosion, or excessive soot. If the plug is worn or damaged, it’s definitely time for a replacement.

Testing the old spark plug can confirm whether it’s truly faulty or just needs cleaning. While this step isn’t always necessary, it’s helpful for diagnosing the issue.

How to test the removed spark plug:

1. Set the multimeter to measure resistance (ohms).
2. Place one probe on the tip of the spark plug and the other on the metal thread.
3. A functioning spark plug typically shows a resistance value within the range specified in your snow blower’s manual.

If the reading is outside the recommended range or there’s no continuity, the plug is faulty and needs replacement.

2. Check the gap

Before installing the new spark plug, make sure it’s set up correctly for your snow blower. The gap (distance between the center and ground electrodes) must match your machine’s specifications.

1. Use a gap gauge or feeler gauge to measure the distance between the electrodes.
2. Refer to your manual for the correct gap size, usually listed in millimeters or inches.
3. If the gap is too wide, gently press the ground electrode closer using the gauge tool.
4. If it’s too narrow, carefully bend the electrode outward. Avoid excessive force to prevent damage.

Tip: Pre-gapped spark plugs are available, but always double-check the gap before installation to ensure accuracy.

3. Install the new spark plug

With the gap properly set, you’re ready to install the new spark plug. 

1. Align the new spark plug with the hole in the engine.
2. Carefully thread it in by hand to avoid cross-threading, which can damage the threads.
3. Use a spark plug socket or wrench to tighten it snugly. Avoid overtightening, as this can crack the plug or strip the threads.
4. Push the spark plug wire back onto the top of the spark plug until it clicks into place.
5. Turn on the ignition and pull the starter cord or press the electric start button, depending on your model.
6. Check that the engine starts easily and runs without hesitation.

Read more: Snowblower won’t start: A troubleshooting guide

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