🔧 Wrangler - Ignition Coil Replacement

Your Wrangler’s ignition coils sit on top of each spark plug and create the high voltage needed to fire the plug. Replacing a failing coil can fix misfires, rough running, and flashing check-engine light issues.

Difficulty Level: Beginner | Estimated Time: 0.8-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep keys out of the ignition so the engine can’t start accidentally.
• ⚠️ Disconnect the negative battery cable if you’ll be unplugging multiple connectors at once.
• ⚠️ Don’t pull on wiring—always release the connector lock first.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 1/4" drive ratchet
• 6" socket extension
• Trim clip removal tool
• Small flat-blade screwdriver
• Torque wrench (inch-pound)
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-6
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to neutral, and set the parking brake.
• Open the hood and let the engine fully cool.
• If you choose to disconnect the battery: use a 10mm socket to remove the negative battery cable and isolate it so it can’t spring back.
• Replace coils one at a time to avoid mix-ups.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a trim clip removal tool to carefully pop any plastic retainers, if present.
• Grip the cover and pull upward to release it from the mounting grommets.
• Set the cover aside where it won’t get stepped on.

Step 2: Locate the ignition coil you’re replacing

• Use a flashlight to find the coil pack sitting on top of the valve cover, directly over a spark plug.
• Each coil has an electrical connector and usually one small hold-down bolt.

Step 3: Unplug the coil electrical connector

• Use a small flat-blade screwdriver only if needed to gently lift the connector lock tab.
• Press the release and pull the connector straight back (do not yank the wires).

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 6" socket extension, and 1/4" drive ratchet to remove the bolt.
• Place the bolt somewhere safe so it doesn’t disappear into the engine bay.

Step 5: Remove the ignition coil

• Grip the coil body and twist it gently left-right to break the boot loose.
• Pull the coil straight up and out.
• If it feels stuck, keep twisting—don’t pry hard against plastic parts.

Step 6: Prep and install the new coil

• Apply a very small dab of dielectric grease inside the rubber boot. (This helps prevent moisture and makes future removal easier.)
• Push the new coil straight down onto the spark plug until you feel it seat.
• Reinstall the hold-down bolt by hand first to avoid cross-threading.

Step 7: Torque the coil bolt and reconnect the connector

• Use a torque wrench (inch-pound) (a tool that clicks at the correct tightness) to tighten the coil bolt.
• Torque to 9 Nm (80 in-lbs)
• Plug the electrical connector back in until it clicks/locks.

Step 8: Repeat for any other coils

• Replace additional coils the same way, one at a time.
• Don’t swap connectors between coils.

Step 9: Reinstall the engine cover and reconnect battery (if disconnected)

• Press the engine cover back onto its grommets until it seats.
• If disconnected, reconnect the negative battery cable using a 10mm socket and tighten snugly.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smooth.
• Take a short test drive and verify there’s no stumbling under acceleration.
• If the check-engine light was on, it may need a scan tool to clear codes after the fix.
• Recheck that every coil connector is fully clicked in.

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💰 DIY vs Shop Cost

Shop Cost: $250-$700 (parts + labor)

DIY Cost: $45-$420 (parts only)

You Save: $205-$280 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.