2018 Tesla Model 3 Spark Plug Type & Gap

Quick reference

Why the right plug matters

While traditional gasoline vehicles rely on spark plugs for ignition, the 2018 Tesla Model 3 is an all-electric vehicle. This means it operates solely on electrical power and does not have an internal combustion engine. Therefore, spark plugs are not present or required in any part of its drivetrain.

In a gasoline engine, spark plugs play a critical role in igniting the air-fuel mixture. The "right plug" is essential for optimal engine performance, fuel efficiency, and emissions. This involves selecting a plug with the correct heat range, electrode material (iridium, platinum, or copper), and gap.

• Heat Range: This refers to the plug's ability to dissipate heat. A plug that's too hot can lead to pre-ignition and engine damage, while one that's too cold can cause fouling.
• Electrode Metal:
  • Iridium: Extremely hard and durable, offering long life and optimal performance. Typically found in modern engines.
  • Platinum: Good durability and performance, often a step up from copper plugs.
  • Copper: Excellent conductivity but less durable, requiring more frequent replacement. Usually found in older vehicles or high-performance applications where frequent changes are acceptable.

How to gap a spark plug

This section is not applicable to the 2018 Tesla Model 3, as it does not utilize spark plugs. However, for traditional gasoline engines, gapping a spark plug is a precise procedure.

1. Identify the correct gap: Always refer to your vehicle's service manual for the manufacturer-recommended spark plug gap.
2. Use a gapping tool: A wire-type feeler gauge is ideal for this. Avoid using a ramp-style gauge as it can damage the electrode.
3. Adjust the gap: If the gap is too small, gently pry up the ground electrode. If it's too large, carefully tap the ground electrode on a hard surface.
4. Re-check: Always re-check the gap after adjustment to ensure accuracy.

Replacement procedure tips

There is no spark plug replacement procedure for the 2018 Tesla Model 3. For vehicles that do have spark plugs, here are some general tips:

• Coil-on-plug removal: Many modern engines use coil-on-plug ignition systems. Carefully disconnect the electrical connector and unbolt the coil pack before gently pulling it straight up to remove it.
• Anti-seize debate: Some technicians apply a small amount of anti-seize compound to the spark plug threads, while others advise against it, citing concerns about altering torque values. If used, apply sparingly.
• Dielectric grease on boots: A tiny amount of dielectric grease inside the spark plug boot can help prevent misfires by sealing out moisture and improving electrical contact.

Known issues

The 2018 Tesla Model 3, being an electric vehicle, does not experience issues related to spark plugs such as cracked porcelain on Ford 3-valve engines or broken plug shells. Its powertrain is entirely electric, so common internal combustion engine problems are not relevant.

Need plugs replaced? Find a shop on Repairius.