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4Runner Spark plugs Install Guide

Your 4Runner

Pick your year to see what fits.

This page covers the US 4Runner.

+0–3 whp (est.)
Hard$60–$902–3 hrs
All 4Runner mods

Why do it

Fresh plugs bring back lost power.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

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Before you start

  • Work on a cold engine. Do one plug at a time.

Steps

  1. Clear the harness

    • Undo the wiring and airbox bolts.
    Watch this step (T4R Garage, on a 5th gen 4Runner) (4:22–7:45)

  2. Swap the first side

    • Swap the plugs and refit the airbox.
    Watch this step (7:45–9:56)

  3. Do the other side

    • Repeat on the other bank.
    Watch this step (9:56–12:09)

How to know it worked

Did this guide work for you?

Safety first

  • Park on flat ground, set the parking brake and chock the wheels.
  • Never get under a car held up only by a jack. Use jack stands.
  • Let the engine and exhaust cool first.
  • Disconnect the battery before unplugging electrical parts.
  • Wear safety glasses.
  • If something doesn't match your car, stop and ask a shop.

Follow your part's instructions and your service manual's torque specs.

Spark Plug install guides for other cars

More 4Runner mods