2019 Honda Pilot Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2019 Honda Pilot is crucial for optimal engine performance, fuel efficiency, and longevity. The "right" plug isn't just about fitment; it's about heat range and electrode material.

• Heat Range: Spark plugs are designed with a specific heat range, indicating how quickly they dissipate heat from the combustion chamber. A plug that's too "hot" (dissipates heat slowly) can lead to pre-ignition and detonation, damaging the engine. A plug that's too "cold" (dissipates heat too quickly) can foul with carbon deposits, leading to misfires and poor performance. The factory-specified plug ensures the correct heat range for your Pilot's 3.5L V6 engine.

• Electrode Metal: Modern engines like the one in your Pilot almost exclusively use iridium or platinum spark plugs. These precious metals are incredibly durable and resistant to wear, allowing for much longer service intervals (typically 100,000 miles or more) compared to traditional copper plugs. While copper plugs offer excellent conductivity, their softer electrode wears much faster, requiring frequent replacement. For your 2019 Honda Pilot, iridium plugs are the OEM standard, providing the best balance of performance and longevity.

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. Even a slight discrepancy can affect combustion efficiency. For your 2019 Honda Pilot, the specified gap is 0.044 inches (1.1 mm).

To gap a spark plug, you will need a wire-type spark plug gapping tool. Avoid using the coin-style gapping tools, as they can damage the delicate iridium electrode. Gently slide the appropriate wire gauge into the gap between the center electrode and the ground electrode. If the gap is too small, carefully bend the ground electrode outwards with the tool. If the gap is too wide, gently tap the ground electrode on a hard, non-abrasive surface to close it. Always be extremely careful not to touch or bend the iridium center electrode, as it is fragile.

Replacement procedure tips

Changing the spark plugs on your 2019 Honda Pilot is a straightforward task, but there are a few tips to ensure a smooth process:

• Coil-on-plug removal: Your Pilot uses a coil-on-plug ignition system, meaning each spark plug has its own ignition coil directly above it. To access the spark plugs, you'll need to disconnect the electrical connector from each coil and then remove the bolt (usually 10mm) holding the coil in place. Gently twist and pull to remove the coil from the spark plug well.

• Anti-seize debate: There is an ongoing debate about using anti-seize compound on spark plug threads. Honda, like many manufacturers, generally recommends against it for their factory-spec plugs, as the plugs are designed with a special coating and anti-seize can alter the torque readings, potentially leading to over-tightening or under-tightening. If you choose to use it, apply a very thin amount only to the threads, avoiding the electrode, and reduce the specified torque by about 10-20%.

• Dielectric grease on boots: Many technicians recommend applying a small amount of dielectric grease inside the spark plug boot (the rubber part of the coil that connects to the plug). This helps to prevent moisture and corrosion, and makes future removal easier. Be careful not to get any dielectric grease on the spark plug electrodes.

Known issues

The 2019 Honda Pilot's 3.5L V6 (J35Y6) engine is generally reliable, and there are no widespread, specific spark plug-related "known issues" similar to the Ford 3-valve engine breakage or GM's ionization-sensing coils. As long as the correct OEM-specified spark plugs are used and replaced at the recommended intervals, you should experience trouble-free operation.

Need plugs replaced? Find a shop on Repairius.