2016 Honda Odyssey: Spark Plug Type, Gap & Torque

Quick Reference

Why The Right Plug Matters

The spark plugs in your Odyssey's 3.5L V6 are a critical component for engine performance, fuel economy, and emissions. Unlike older vehicles that used simple copper plugs, modern engines like yours rely on precious-metal plugs for a reason.

• Heat Range: This is the plug's ability to dissipate heat. A plug that's too "hot" can cause pre-ignition, while a "cold" plug can foul with carbon deposits. The plugs specified for your Odyssey are designed for its specific combustion chamber temperatures.
• Electrode Metal: The OEM NGK and Denso plugs are iridium-tipped. Iridium is an extremely hard and durable precious metal, which allows for a very fine center electrode. This concentrated point requires less voltage to create a spark, resulting in a more consistent and powerful ignition event. Platinum plugs are a good alternative, but won't last as long as iridium. Copper is not recommended for this application, as it would wear out in a fraction of the time and compromise performance.

How to Gap a Spark Plug

Properly gapping your spark plugs is crucial for optimal performance. While the OEM plugs come pre-gapped, it's always a good idea to verify the gap before installation. You'll need a feeler gauge or a wire-style gap tool.

1. Insert the 0.044-inch (1.1mm) gauge between the center and ground electrodes.
2. The gauge should slide through with a slight drag. If it's too loose or too tight, you'll need to adjust the gap.
3. To adjust, gently bend the ground electrode (the curved part) in or out. Never pry against the fragile center electrode. Use a pair of needle-nose pliers or the adjustment tool on your gapper. Small, gentle bends are all that's needed.

Replacement Procedure Tips

The 2016 Odyssey uses a coil-on-plug ignition system, which means each spark plug has its own ignition coil directly on top of it. This makes replacement relatively straightforward.

• Coil-on-Plug Removal: To access the rear bank of cylinders, you may need to remove the plastic engine cover. Each coil is held down by a single 10mm bolt. Unplug the electrical connector, remove the bolt, and gently twist and pull the coil straight up to remove it.
• The Anti-Seize Debate: There is some debate in the professional community about whether or not to use anti-seize compound on spark plug threads. The concern is that the anti-seize can act as a lubricant, causing you to over-torque the plugs. However, many technicians still use a very small amount on the threads to prevent them from seizing in the aluminum cylinder heads. If you do use it, reduce the torque by about 10-15%. The OEM plugs have a special coating that serves the same purpose.
• Dielectric Grease: A small dab of dielectric grease inside the spark plug boot (the end of the coil that connects to the plug) is highly recommended. This prevents the boot from sticking to the plug and makes future removal much easier. It also helps to seal out moisture and prevent misfires.

Known Issues

Fortunately, the 3.5L V6 in the 2016 Honda Odyssey is not known for any major spark plug-related issues like the Ford 3-valve Triton engines, which were notorious for two-piece plugs that would break off in the cylinder head.

Need plugs replaced? Find a shop on Repairius.