How to Fix a Spark Plug Gap That Is Too Wide

Fixing a spark plug gap that is too wide is essential for maintaining your engine’s performance and efficiency. A properly gapped spark plug ensures optimal combustion, leading to better fuel economy and smoother engine operation. In this guide, we’ll walk you through the steps to correct a wide spark plug gap and provide tips for ensuring your engine runs smoothly.

What Is a Spark Plug Gap and Why Is It Important?

The spark plug gap is the distance between the center and ground electrodes of a spark plug. This gap is crucial because it determines the spark’s ability to ignite the fuel-air mixture in the engine’s combustion chamber. A gap that is too wide can lead to misfires, reduced fuel efficiency, and increased emissions.

How to Measure the Spark Plug Gap?

Before you can fix the gap, you need to measure it accurately. Here’s how:

1. Remove the Spark Plug: Use a spark plug socket to carefully remove the plug from the engine.
2. Use a Feeler Gauge: Insert a feeler gauge between the electrodes. The correct gap size is usually specified in your vehicle’s manual.
3. Check the Measurement: Ensure the gauge slides through with slight resistance. If it doesn’t, the gap may be too wide or too narrow.

How to Adjust a Wide Spark Plug Gap?

If your spark plug gap is too wide, follow these steps to adjust it:

1. Use a Gap Tool: A spark plug gap tool is essential for adjusting the gap. It typically includes a wire loop and a flat blade.
2. Bend the Side Electrode: Gently bend the side electrode inward using the tool. Be careful not to damage the electrode or the ceramic insulator.
3. Recheck the Gap: After adjusting, measure the gap again with the feeler gauge to ensure it’s within the recommended range.
4. Repeat if Necessary: If the gap is still too wide, repeat the process until the correct measurement is achieved.

What Tools Do You Need to Fix a Spark Plug Gap?

Having the right tools makes the process straightforward. Here’s what you’ll need:

• Spark Plug Socket: For removing the spark plug.
• Feeler Gauge: To measure the gap accurately.
• Spark Plug Gap Tool: For adjusting the gap.

Common Mistakes When Adjusting Spark Plug Gaps

Avoid these common mistakes to ensure a successful adjustment:

• Forcing the Electrodes: Applying too much force can damage the electrode or insulator.
• Incorrect Measurement: Always double-check your measurements to avoid misfires.
• Using Improper Tools: Ensure you use tools specifically designed for spark plug maintenance.

Practical Example: Adjusting a Spark Plug Gap

Imagine you own a 2015 Honda Civic, and the recommended spark plug gap is 0.044 inches. You measure and find that the gap is 0.050 inches:

1. Remove the spark plug using the socket.
2. Measure the gap with the feeler gauge.
3. Use the gap tool to gently bend the side electrode inward.
4. Recheck with the feeler gauge until the gap is 0.044 inches.

People Also Ask

What Happens if the Spark Plug Gap Is Too Wide?

A gap that is too wide can cause misfires, rough idling, and poor fuel economy. The spark may not be strong enough to ignite the fuel-air mixture, leading to inefficient combustion.

Can I Use Any Feeler Gauge for Measuring Spark Plug Gaps?

Yes, you can use any feeler gauge, but ensure it includes the specific measurements required for your spark plug. A gauge with incremental markings is ideal for precision.

How Often Should I Check My Spark Plug Gaps?

It’s advisable to check your spark plug gaps every time you perform a tune-up or replace the plugs. Regular checks ensure optimal engine performance and prevent potential issues.

What Is the Ideal Spark Plug Gap?

The ideal spark plug gap varies by vehicle. Refer to your vehicle’s manual or the spark plug manufacturer’s specifications for the correct gap size.

Can Incorrect Spark Plug Gaps Damage the Engine?

While incorrect gaps won’t directly damage the engine, they can lead to poor performance, increased emissions, and potential long-term issues if not corrected.

Summary

Fixing a spark plug gap that is too wide is a simple yet crucial task for maintaining your vehicle’s performance. By ensuring the gap is within the recommended range, you can improve fuel efficiency, reduce emissions, and prevent engine misfires. Regular maintenance and attention to detail can extend your engine’s lifespan and ensure a smoother driving experience.

For more tips on vehicle maintenance, check out our articles on engine tune-ups and fuel efficiency improvement.