Home › Mitsubishi Eclipse › Spark plugs

Eclipse · Power

Eclipse Spark plugs Install Guide

Your Eclipse

Pick your year to see what fits.

Restores lost power
Medium$30–$901–2 hrs
All Eclipse mods

Why do it

Worn plugs cost power and throttle response.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

Double-check fitment before buying. We may earn a commission when you buy through these links, at no extra cost to you.

Before you start

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

Steps

  1. Clear the top

    • Remove the parts in the way.
    Watch this step (on a 4G Eclipse GT) (1:20–6:56)

  2. Get to the right side

    • Reach the other bank.
    Watch this step (6:56–10:05)

  3. Swap the plugs

    • Fit and torque the new plugs.
    Watch this step (10:05–11:34)

  4. Remove the cover

    • Take off the beauty cover.
    Watch this step (on a 4G Eclipse GS) (1:08–1:48)

  5. Remove the coils

    • Unplug and unbolt them.
    Watch this step (1:48–2:51)

  6. Remove the plugs

    • Use a 5/8 socket.
    Watch this step (2:51–3:55)

  7. Clean and gap

    • Clean the wells and gap the plugs.
    Watch this step (3:55–4:57)

  8. Fit and torque

    • Torque to 18 ft-lbs.
    Watch this step (4:57–6:21)

  9. Refit

    • Refit the coils and cover.
    Watch this step (6:21–7:23)

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 Eclipse mods