2025 Tesla Model 3 Spark Plug Type & Gap

Quick reference

Why the right plug matters

It's crucial to understand the role of spark plugs in a traditional internal combustion engine (ICE). They ignite the air-fuel mixture, and their performance directly impacts engine efficiency, power, and emissions. Key factors like heat range, electrode material (iridium, platinum, copper), and proper gapping are vital for optimal operation.

Heat Range

The spark plug's heat range refers to its ability to dissipate heat. A "hot" plug has a longer insulator nose, which keeps it hotter to burn off carbon deposits in a cooler-running engine. A "cold" plug has a shorter insulator nose, dissipating heat more quickly and preventing pre-ignition in high-performance or hot-running engines.

Electrode Metal

• Iridium: The hardest and most durable of electrode materials, iridium plugs offer the longest lifespan and excellent performance. They are often found in modern vehicles due to their extended replacement intervals.
• Platinum: Similar to iridium, platinum plugs provide good durability and a longer lifespan than copper plugs. They are a common choice for many engines.
• Copper: Copper is an excellent conductor of electricity and heat, making copper plugs ideal for high-performance applications where frequent replacement is acceptable. However, they have the shortest lifespan of the three.

How to gap a spark plug

Properly gapping a spark plug ensures the correct distance between the center and ground electrodes for optimal spark. You'll need a gap gauge, typically a wire-style or coin-style tool.

1. Check the gap: Slide the appropriate feeler gauge between the electrodes. It should have a slight drag.
2. Adjust the gap: If the gap is too small, carefully bend the ground electrode outwards using the gapping tool's adjuster. If it's too wide, gently tap the ground electrode on a hard, non-marring surface to close the gap.
3. Recheck: Ensure the gap is within specification.

Replacement procedure tips

For traditional ICE vehicles, specific tips apply:

• Coil-on-plug removal: Many modern engines use a coil-on-plug (COP) system where each spark plug has its own ignition coil directly on top. Carefully disconnect the electrical connector and remove the coil by gently pulling and twisting.
• Anti-seize debate: There's ongoing debate about using anti-seize on spark plug threads. Most modern spark plug threads are coated, and anti-seize can alter torque readings, potentially leading to over-tightening. Consult the spark plug or vehicle manufacturer's recommendations.
• Dielectric grease on boots: Apply a small amount of dielectric grease inside the spark plug boots (the part that connects to the coil or wire) to prevent sticking and improve electrical contact.

Known issues

There are no known spark plug-related issues for the 2025 Tesla Model 3 because it is an all-electric vehicle and does not utilize spark plugs or an internal combustion engine.

Need plugs replaced? Find a shop on Repairius.