2017 Toyota RAV4 Spark Plug Guide

Quick Reference

Why The Right Plug Matters

The spark plugs in your RAV4's engine are small, but they play a huge role in performance and fuel economy. Using the correct plugs ensures a strong, consistent spark for efficient combustion. Here's what to consider:

• Heat Range: This determines how quickly the plug dissipates heat. A "hotter" plug burns off carbon deposits more effectively at low speeds, while a "colder" plug is needed for high-performance driving to prevent overheating. For the 2017 RAV4, sticking to the OEM-specified heat range is crucial.
• Electrode Material:
  • Iridium: The 2017 RAV4 comes with iridium plugs from the factory, and for good reason. They have a very high melting point and offer the best performance and longest life—up to 120,000 miles.
  • Platinum: A good alternative to iridium, platinum plugs also offer long life and consistent performance, typically lasting up to 100,000 miles.
  • Copper: While once the standard, copper plugs have the shortest lifespan (around 20,000-30,000 miles). They are not recommended for the 2017 RAV4, which is designed for long-life iridium plugs.

How to Gap a Spark Plug

Properly gapping your spark plugs is essential for a healthy engine. The gap is the small space between the center and ground electrodes. If it's too wide, the spark may be weak; if it's too narrow, it can cause a rough idle.

1. Use a Feeler Gauge: A wire-style or feeler gauge is the most accurate tool for measuring the gap.
2. Check the Gap: Slide the correct-sized wire or blade of the gauge between the electrodes. It should have a slight drag.
3. Adjust if Necessary: If the gap is too wide, gently tap the ground electrode on a hard surface to close it. If it's too narrow, use the tool on the gapper to carefully bend the ground electrode open. Never pry against the center electrode, as this can damage the plug.

Replacement Procedure Tips

The 2017 RAV4 uses a coil-on-plug ignition system, which makes changing the plugs a straightforward job. Here are some tips:

• Coil-on-Plug Removal: Each spark plug has its own ignition coil. To access the plugs, you'll first need to remove the engine cover, then disconnect the electrical connector and unbolt each coil. Gently twist and pull the coil straight up to remove it.
• The Anti-Seize Debate: There is some debate on whether to use anti-seize on spark plug threads. The concern is that it can act as a lubricant, leading to over-torquing. Since the 2017 RAV4 has an aluminum cylinder head, it's best to use a small amount of anti-seize to prevent the steel plugs from getting stuck. Just be sure to reduce the torque by about 10-15% to compensate.
• Dielectric Grease: Apply a small amount of dielectric grease to the inside of the spark plug boot before reinstalling the ignition coils. This helps seal out moisture and prevents the boot from sticking to the plug.

Known Issues

Fortunately, the 2017 Toyota RAV4 and its 2.5L engine have no widespread "known issues" related to spark plugs, such as the cracked porcelain or breakage problems that have plagued some other manufacturers. The ignition system is robust and reliable, so as long as you use quality parts and proper procedures, you can expect a trouble-free experience.

Need plugs replaced? Find a shop on Repairius.