2018 Honda CR-V Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2018 Honda CR-V is more critical than you might think. Spark plugs are not "one size fits all," and using the wrong type can lead to reduced performance, decreased fuel economy, and even engine damage.

• Heat Range: The heat range of a spark plug dictates how efficiently it dissipates heat from the combustion chamber. A plug that's too "cold" (dissipates heat too quickly) can lead to fouling, while one that's too "hot" (dissipates heat too slowly) can cause pre-ignition and detonation, which are highly detrimental to engine health. Honda engineers specifically design the engine to operate optimally with a particular heat range, so sticking to OEM-recommended plugs or their direct equivalents is crucial.
• Electrode Metal: Modern Honda CR-V engines, especially the turbocharged 1.5L, are designed for long-life iridium spark plugs. Iridium is an incredibly hard and durable precious metal that allows for very fine electrodes. This thin electrode concentrates the spark energy, leading to a more consistent and powerful spark. This improved combustion results in better fuel efficiency and lower emissions. Platinum plugs also offer extended life compared to traditional copper plugs, but typically not as long as iridium. Copper plugs, while excellent conductors, wear out much faster and are generally not specified for modern, high-performance engines like those found in the 2018 CR-V.

How to gap a spark plug

While most iridium and platinum spark plugs come pre-gapped from the factory, it's always a good practice to double-check the gap before installation, especially for the 2018 Honda CR-V. Even a slight jolt during shipping can alter the gap.

1. Obtain a Gap Tool: You'll need a wire-type spark plug gap gauge. Avoid disc-style gauges for iridium and platinum plugs, as they can damage the delicate fine-wire electrode.
2. Measure the Gap: Carefully slide the correct-sized wire from your gauge between the center and ground electrodes. It should slide through with a slight drag.
3. Adjust (if necessary): If the gap is too small, use the bending tool on most wire gauges or very gently pry the ground electrode open with a purpose-made gapping tool. If the gap is too wide, gently tap the ground electrode on a clean, hard surface. Never pry or tap directly on the center electrode, as this will almost certainly damage the plug.
4. Re-measure: Always re-measure after any adjustment to ensure accuracy.

Replacement procedure tips

Replacing spark plugs on your 2018 Honda CR-V is a relatively straightforward DIY task, thanks to its coil-on-plug ignition system. However, a few tips can make the process smoother and prevent common headaches:

• Coil-on-Plug Removal: Each spark plug has its own ignition coil directly mounted on top. To remove, first disconnect the electrical connector by pressing the release tab. Then, firmly but gently pull straight up on the coil. If it's stubborn, a slight twisting motion can help break it free. Avoid yanking on the wires.
• Anti-Seize Debate: There's lively debate among technicians about using anti-seize on spark plug threads. Most modern spark plugs, especially those from NGK and Denso, have a special coating on the threads that acts as an anti-seize agent. Applying additional anti-seize can alter the torque readings, potentially leading to over-tightening and thread damage. For your 2018 CR-V, it's generally recommended to install new plugs dry and torque them to the manufacturer's specification. If you do opt for anti-seize, use a very small amount and reduce the torque specification by about 20%.
• Dielectric Grease on Boots: A small dab of dielectric grease inside the ignition coil boot (where it contacts the spark plug porcelain) is a good idea. This helps prevent moisture intrusion, insulates against voltage leaks, and makes future removal easier.
• One at a Time: To avoid mixing up ignition coil connectors and to ensure no debris falls into an open spark plug well, it's best to work on one spark plug at a time. Remove one coil, remove the old plug, install the new plug, reinstall the coil, and then move to the next cylinder.
• Socket Type: Always use a spark plug socket with a rubber insert to protect the porcelain insulator and help grip the plug for removal and installation.

Known issues

Fortunately, the 2018 Honda CR-V does not have any widespread or notorious spark plug-related issues like the Ford 3-valve 2-piece plug breakage or GM's ionization-sensing coils that require specific plug types. As long as you use the correct OEM or equivalent iridium plugs and follow the recommended replacement interval, your CR-V's ignition system should provide reliable service.

Need plugs replaced? Find a shop on Repairius.