2004 Honda Civic Spark Plug Gap

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Maintaining your 2004 Honda Civic is crucial to keep it running at its best and avoid costly repairs down the road. The replacement of spark plugs is one of the crucial maintenance procedures that should be carried out on a regular basis. The air-fuel mixture in the engine that drives your car is ignited by the spark plugs.

In this article, we will discuss the importance of spark plugs, the tools and materials required, and step-by-step instructions on how to replace the spark plug in a 2004 Honda Civic with a 1.7-litre VTEC engine.

But before doing anything, I want to answer the main question, 2004 Honda Civic Spark Plug Gap, the reason you are here.

So, what is the 2004 Honda Civic Spark Plug Gap? For a 2004 Honda Civic, the spark plug gap is 0.044 inches (1.1 mm). It is crucial to consult the owner’s manual for detailed instructions tailored to your unique engine.

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What Are Spark Plugs and Why Do They Need to Be Replaced?

Spark plugs are microscopic engine components that are housed in the cylinder head. They are responsible for igniting the air-fuel mixture in the combustion chamber using a spark.

Spark plugs can become worn and dusty over time, resulting in misfires, poor fuel economy, and diminished engine performance.

The spark plugs should be replaced every 30,000 to 100,000 miles, depending on the manufacturer’s recommendation.

Tools and Materials:

To replace the spark plugs in a 2004 Honda Civic with a 1.7-litre VTEC engine, you will need the following tools and materials:

  • New spark
  • plugs
  • Flatblade
  • screwdriver
  • 10mm socket
  • or wrench
  • 5/8 spark
  • plug socket with a ratchet and extension
  • Torque wrench
  • Spark plug
  • gap tool (optional)


To replace the spark plugs in your car, follow these steps:

  • Open the hood of your car and use a flat-blade screwdriver to remove the top trim panel.
  • Locate the ignition coils on the top of the engine, they should be visible with four in total.
  • Use a 10mm socket or wrench to loosen the nuts holding the ignition coils in place and carefully remove the coils. Disconnect the harness connections.
  • With the ignition coils out of the way, you will have access to the spark plugs. Use a 5/8 spark plug socket with a ratchet and extension to remove the old plugs.
  • Check the gap on the new plugs with a spark plug gap tool to make sure it is set between 1 and 1.1mm.
  • Carefully install the new plugs into the engine, making sure not to cross-thread them.
  • Use a torque wrench to tighten the new plugs to 13 foot-pounds.
  • Repeat the process for the remaining three plugs.
  • Reinstall the ignition coils, reconnect the harness connections, and replace the top trim panel.
  • Start your car and check for any issues.

Note: Always refer to your owner’s manual for the specific instructions for your vehicle. It is also important to note that the mileage intervals for replacing spark plugs may vary depending on your driving habits and conditions. Consult with your mechanic or the manufacturer’s recommendations for the best interval for you.

Take Away

Replacing the spark plugs in a 2004 Honda Civic with a 1.7-liter VTEC engine is a straightforward process that can be done with a few basic tools. You can make sure that your car works at its peak performance and avert any potential troubles by according to these recommendations and applying the proper torque. However, it is preferable to seek advice from a qualified mechanic if you feel uneasy performing this task.

Frequently Asked Questions

Can I Adjust the Spark Plug Gap On My 2004 Honda Civic?

Yes, you can adjust the spark plug gap on your 2004 Honda Civic by using a spark plug gap tool to bend the electrode until the desired gap is achieved. However, it is recommended to check the owner’s manual for specific recommendations for your particular engine.

Yes, using a spark plug with a gap that is too large or too small can cause problems such as misfires, poor fuel economy, and engine damage. It is important to always use spark plugs with the correct gap, as recommended by the manufacturer.

Are Platinum or Iridium Spark Plugs Better for My 2004 Honda Civic?

Both Platinum and Iridium spark plugs are designed to last longer and provide better performance than traditional copper spark plugs. However, it is recommended to check the owner’s manual or a qualified mechanic for specific recommendations for your vehicle before installing Platinum or Iridium spark plugs.

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M Waqas Saeed

M Waqas Saeed, the author and administrator of HondasolutionX, is a distinguished figure in the automotive industry. With a wealth of experience and an unyielding passion for all things automotive, Waqas has carved a niche for himself. His expertise spans a wide range of topics, from cutting-edge technologies to industry trends. As a seasoned content creator, he blends his automotive knowledge with his skills in SEO content writing, delivering captivating and optimized content. Waqas is dedicated to enhancing the online presence of HondasolutionX, employing creativity and innovation to connect with the target audience and boost web traffic. He's a driving force behind the company's success.