2018 Toyota Camry Spark Plug Type & Gap

Quick Reference

Why the Right Plug Matters

Spark plugs are a critical component in your 2018 Toyota Camry's ignition system, responsible for igniting the air-fuel mixture in your engine's cylinders. Using the correct spark plug type, heat range, and gap is paramount for optimal engine performance, fuel efficiency, and longevity.

Heat Range: Spark plugs are designed with a specific "heat range," which refers to the plug's ability to dissipate heat. A plug that is too "cold" (dissipates heat too quickly) can lead to fouling, while a plug that is too "hot" (dissipates heat too slowly) can cause pre-ignition and engine damage. The OEM plugs specified for your Camry are engineered for the optimal heat range.

Electrode Metal: Modern engines like those in the 2018 Camry predominantly use long-life iridium or platinum spark plugs. These precious metals are much harder and more durable than traditional copper, allowing for smaller, finer electrodes that produce a more consistent and powerful spark for a longer period. While copper plugs offer excellent conductivity, their shorter lifespan makes them unsuitable for the extended service intervals of modern vehicles. The Denso and NGK plugs listed above are iridium-tipped, designed for 120,000-mile service intervals.

How to Gap a Spark Plug

While many modern iridium spark plugs come pre-gapped from the factory, it's always a good practice to verify the gap before installation. This is especially true if you're not using the exact OEM part number, or if the plugs were handled roughly during shipping. For the 2018 Toyota Camry, both the 2.5L I4 and 3.5L V6 engines require a spark plug gap of 0.043 inches (1.1 mm).

To check and adjust the gap, use a wire-type spark plug gapping tool. Gently slide the correct wire gauge between the center and ground electrodes. If the gap is too small, carefully bend the ground electrode outwards using the gapping tool's adjustment tab. If the gap is too large, gently tap the ground electrode on a clean, solid surface to close the gap. Avoid bending the center electrode or applying excessive force, as this can damage the fine iridium tip.

Replacement Procedure Tips (2.5L I4 & 3.5L V6)

The 2018 Toyota Camry utilizes a coil-on-plug ignition system, meaning each spark plug has its own individual ignition coil. This simplifies the replacement process compared to older distributor-based systems.

• Coil-on-Plug Removal: Begin by disconnecting the battery. Carefully disconnect the electrical connector from each ignition coil. Then, unbolt the coil (typically one or two small bolts per coil) and gently pull it straight up to remove it from the spark plug well. Avoid yanking or twisting, as this can damage the coil boot or the spark plug itself.
• Anti-Seize Debate: There is ongoing debate about using anti-seize compound 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. Applying additional anti-seize can alter the torque readings, leading to over-tightening and potential damage to the cylinder head threads. Refer to the spark plug manufacturer's recommendations. For the recommended Denso and NGK plugs, anti-seize is generally not required.
• Dielectric Grease on Boots: A small amount of dielectric grease applied to the inside of the ignition coil boot can help prevent moisture intrusion and make future removal easier. Be sure to apply it sparingly to avoid contaminating the electrical contacts.
• Torque Specifications: Always torque spark plugs to the manufacturer's exact specifications. For both engines in your 2018 Camry, the torque specification is 13 lb-ft (18 Nm). Over-tightening can strip the threads in the cylinder head or crack the spark plug insulator, while under-tightening can lead to combustion gas leaks and plug overheating.

Known Issues (Not Applicable for 2018 Toyota Camry)

Fortunately, the 2018 Toyota Camry, with its A25A-FKS 2.5L I4 and 2GR-FKS 3.5L V6 engines, does not have any widespread or notorious spark plug-related issues like the Ford 3-valve modular engines with their problematic two-piece spark plugs or GM's early ionization-sensing coils.

Need plugs replaced? Find a shop on Repairius.