2019 Toyota Tundra Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2019 Toyota Tundra is crucial for optimal engine performance, fuel efficiency, and longevity. Spark plugs are not a universal component; different engine designs require specific heat ranges, electrode materials, and gap settings to function properly. Using the wrong plug can lead to misfires, reduced power, decreased fuel economy, and even engine damage.

Heat range refers to the plug's ability to dissipate heat from the combustion chamber. A plug that is too "cold" (dissipates heat too quickly) can lead to fouling, where carbon deposits build up on the electrode. A plug that is too "hot" (dissipates heat too slowly) can cause pre-ignition or detonation, which can severely damage engine components. Your Tundra's engine is designed for a specific heat range, and the OEM and recommended aftermarket plugs meet this requirement.

Electrode metal is another critical factor. Modern engines, like those in the 2019 Tundra, typically utilize iridium or platinum plugs. These precious metals are highly durable and resist wear exceptionally well, allowing for extended service intervals (often 100,000 miles or more). Iridium plugs, being even harder and more resistant to erosion than platinum, are often found in the latest applications. Copper plugs, while excellent conductors, have a much shorter lifespan due to the softer nature of copper and are generally not specified for modern, high-performance engines like those in your Tundra.

How to gap a spark plug

Correct spark plug gap is essential for a strong, consistent spark. The gap specification for your 2019 Tundra is 0.043 inches (1.1 mm). While most iridium and platinum plugs come pre-gapped from the factory, it's always a good practice to double-check before installation.

To gap a spark plug, use a wire-style or coin-style spark plug gap tool. Carefully slide the appropriate thickness wire or the tapered edge of the coin tool between the center and ground electrodes. If the gap is too small, gently bend the ground electrode outwards. If the gap is too large, carefully tap the ground electrode on a hard surface to close it. Be extremely gentle when adjusting iridium or platinum plugs, as the fine-wire electrodes can be easily damaged. Avoid using flat blade gap tools, as these can easily damage the delicate electrode tips.

Replacement procedure tips

Replacing spark plugs on your 2019 Toyota Tundra is a manageable DIY task for many, but a few tips can make the process smoother:

• Coil-on-plug (COP) removal: Your Tundra uses a coil-on-plug ignition system, meaning each spark plug has its own ignition coil directly mounted on top. To access the plugs, you'll first need to disconnect the electrical connector from each coil and then remove the bolt (usually a 10mm) securing the coil to the valve cover. Carefully pull the coil straight up to remove it.
• Anti-seize debate: There's ongoing discussion about whether to use anti-seize compound on spark plug threads. For spark plugs with nickel-plated shells, like the OEM plugs for your Tundra, manufacturers generally advise against using anti-seize. The nickel plating provides sufficient anti-seize properties, and adding more can alter the torque readings, potentially leading to over-tightening and plug or cylinder head damage. Always refer to the spark plug manufacturer's recommendations.
• Dielectric grease on boots: Apply a small amount of dielectric grease to the inside of the spark plug boot (the rubber part of the ignition coil that connects to the spark plug). This helps to prevent moisture intrusion, improves electrical insulation, and makes future removal easier.
• Torque specs are critical: Over-tightening spark plugs can damage the threads in the cylinder head or crack the spark plug insulator. Under-tightening can lead to compression leaks, misfires, and allow the plug to vibrate loose. Always use a torque wrench set to 15 lb-ft (20 Nm) for your Tundra.
• One at a time: Work on one spark plug at a time. This helps prevent mixing up ignition coils and ensures no foreign objects fall into an open cylinder.

Known issues

Fortunately, the 2019 Toyota Tundra with the 4.6L (1UR-FE) or 5.7L (3UR-FE) V8 engines does not have widespread, well-documented spark plug-related issues akin to the problematic two-piece spark plugs in some Ford 3-valve engines. The engines are generally robust, and with proper maintenance and the correct spark plugs, you should experience reliable ignition performance.

Need plugs replaced? Find a shop on Repairius.