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Wrangler Spark plugs Install Guide

Your Wrangler

Pick your year to see what fits.

This page covers the US Wrangler.

Restores lost power
Hard$85–$1902–5 hrs
All Wrangler 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

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

Steps

  1. Prepare

    • Apply anti-seize to the new plugs.
    Watch this step (on a 2007-2011 3.8L) (1:17–3:02)

  2. Do the driver side

    • Swap the plugs on this side.
    Watch this step (4:26–7:15)

  3. Reconnect the wires

    • Reconnect the plug wires.
    Watch this step (7:15–9:06)

  4. Do the passenger side

    • Swap the plugs on this side.
    Watch this step (9:06–11:56)

  5. Remove the intake manifold

    • Take off the intake manifold.
    Watch this step (The Ice Cold, on a JK 3.6L) (0:20–2:40)

  6. Remove the coils

    • Pull the coils.
    Watch this step (2:40–3:15)

  7. Remove the old plugs

    • Unscrew each plug.
    Watch this step (3:15–4:12)

  8. Fit the new plugs

    • Thread them in and torque them.
    Watch this step (4:12–5:10)

  9. Replace the gasket

    • Fit the new manifold gasket.
    Watch this step (5:10–5:58)

  10. Put it back

    • Reassemble.
    Watch this step (5:58–7:25)

  11. Remove the engine parts

    • Take off the parts on top.
    Watch this step (on a 3.6L Pentastar) (7:46–12:33)

  12. Remove the plenum

    • Take off the plenum.
    Watch this step (12:33–18:55)

  13. Replace the plugs

    • Replace the plugs.
    Watch this step (18:55–25:13)

  14. Put it back

    • Reassemble.
    Watch this step (25:13–28:32)

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

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