2023 Honda Accord Spark Plug Type & Gap

Quick reference

*Note: The 2.0L Turbo engine was discontinued for the 2023 model year in the Honda Accord, but for reference, the recommended spark plug specifications are included.

Why the right plug matters

Choosing the correct spark plug for your 2023 Honda Accord is crucial for optimal engine performance, fuel efficiency, and longevity. Spark plugs are not "one size fits all" components; they are engineered with specific heat ranges, electrode materials, and designs tailored to individual engine requirements.

Heat Range: The heat range refers to the plug's ability to dissipate heat from the combustion chamber. A plug that's too "cold" (dissipates heat too quickly) can lead to fouled plugs and misfires, especially in stop-and-go driving. Conversely, a plug that's too "hot" (dissipates heat too slowly) can cause pre-ignition or detonation, which can severely damage engine components. Honda engineers have selected plugs with the ideal heat range for each Accord engine.

Electrode Metal: Modern spark plugs utilize various electrode materials, each with its own advantages:

• Iridium: The most common choice for modern engines like the 2023 Accord, iridium plugs offer exceptional durability and a fine-wire center electrode. This allows for a more focused spark and extended service intervals, typically 100,000 miles or more.
• Platinum: Platinum plugs are also long-lasting, providing good performance and fuel economy. They are often used in engines where iridium isn't specified but still offer a significant improvement over copper plugs in terms of lifespan.
• Copper: While excellent conductors, copper plugs have a much shorter lifespan due to electrode wear. They are rarely specified for modern, high-performance engines like those found in the 2023 Accord due to their frequent replacement intervals.

Using the wrong electrode material can significantly reduce the spark plug's lifespan and potentially lead to misfires and poor engine performance.

How to gap a spark plug

While many modern iridium spark plugs come "pre-gapped" from the factory, it is always a good practice to verify the gap before installation. Never attempt to "gap" fine-wire iridium or platinum plugs by bending the center electrode. Instead, focus on carefully adjusting the ground electrode.

1. Obtain a gap tool: A wire-type gap gauge is ideal for accurately measuring the distance between the center and ground electrodes. Avoid using coin-style or ramp-style gauges on fine-wire plugs, as they can damage the delicate electrode.
2. Measure the gap: Carefully slide the appropriate wire gauge between the electrodes. It should have a slight drag. If the gap is incorrect, proceed to the next step.
3. Adjust the ground electrode: If the gap is too small, gently pry the ground electrode open slightly using the adjustment tool on the gauge. If the gap is too large, carefully tap the ground electrode on a clean, hard surface to close it. Make very small adjustments and remeasure frequently. Never bend the center electrode.

Replacement procedure tips

Replacing spark plugs on your 2023 Honda Accord involves some specific considerations:

• Coil-on-plug (COP) removal: The 2023 Accord engines utilize a coil-on-plug ignition system. Each spark plug has its own ignition coil directly mounted on top. To access the plugs, you'll need to carefully disconnect the electrical connector from each coil and then remove the coil mounting bolt(s). Gently twist and pull the coil straight up to remove it. Avoid prying, as this can damage the coil or the spark plug boot.
• Anti-seize debate: There is an ongoing debate about using anti-seize on spark plug threads. Many modern spark plugs (especially NGK and Denso) feature special coatings on their threads to prevent seizing and provide consistent torque readings. Using anti-seize on these plugs can actually lead to over-torquing and potential damage to the cylinder head or spark plug. Honda does not recommend using anti-seize for the 2023 Accord. If you choose to use it, apply a very thin coat and reduce the torque specification by approximately 10-20%.
• Dielectric grease on boots: Applying a small amount of dielectric grease inside the spark plug boot (the part that connects to the spark plug porcelain) can help prevent moisture intrusion and make future removal easier. Be careful not to get any grease on the actual electrode tip.
• Torque specs are critical: Always use a torque wrench to tighten the new spark plugs to the manufacturer's specified values. Over-tightening can damage the spark plug or the cylinder head threads, while under-tightening can lead to combustion gas leakage and potential misfires.

Known issues

Fortunately, the 2023 Honda Accord engines (1.5L Turbo, 2.0L Hybrid, and the previously offered 2.0L Turbo) are not known for any specific spark plug-related issues like the two-piece plug breakage seen in some older Ford 3-valve engines. The ignition systems are generally robust. However, as with any vehicle, it's important to use the correct OEM or equivalent quality spark plugs to avoid potential misfires or premature wear.

Need plugs replaced? Find a shop on Repairius.