🔧 Wrangler - Ignition Coil Replacement

Your Wrangler’s ignition coils create the high voltage needed to fire the spark plugs. Replacing a weak or failed coil can fix misfires, rough idle, poor power, and a flashing check-engine light.

Difficulty Level: Beginner | Estimated Time: 0.5–1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; coils sit near hot parts.
• ⚠️ Turn the key off and keep it out of the ignition.
• ⚠️ Disconnect the negative battery cable to avoid accidental shorts.
• ⚠️ Pull on connectors (plastic), not the wires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" socket extension
• Torque wrench (in-lb or Nm capable)
• Small flathead screwdriver
• Needle-nose pliers
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 6 if replacing all)
• Dielectric grease - Qty: 1
• Spark plugs - Qty: 6 (optional, recommended if due)

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📋 Before You Begin

• Park on level ground, set the parking brake, and put the transmission in neutral.
• Open the hood and let the engine fully cool.
• Disconnect the negative battery cable using a 10mm socket, then move it aside so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the coils

• Use a flashlight to locate the ignition coils along the top/sides of the engine (one coil per cylinder).
• If anything is blocking access (like a small cover/duct), remove it with a 10mm socket and 1/4" drive ratchet, then set fasteners aside in a safe spot.

Step 2: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight off the coil.
• If the tab is stubborn, gently help it with a small flathead screwdriver (don’t force it). Plastic tabs break easily.

Step 3: Remove the coil retaining bolt

• Use a 10mm socket, 6" socket extension, and 1/4" drive ratchet to remove the coil bolt.
• Place the bolt somewhere you won’t lose it.

Step 4: Remove the ignition coil

• Grab the coil body and twist it slightly left-right to break the seal, then pull it straight out.
• If it’s stuck, use needle-nose pliers only to help wiggle the coil gently—don’t crush it.
• Look down the spark plug well for oil or coolant. If you see oil, that can point to a valve cover gasket issue.

Step 5: Prep the new coil

• Put a small pea-sized dab of dielectric grease inside the new coil boot (the rubber end that seals to the spark plug).
• Dielectric grease is a non-conductive grease that helps prevent moisture and makes future removal easier.

Step 6: Install the new coil

• Push the coil straight down until you feel it seat fully on the spark plug.
• Install the coil bolt by hand first (to avoid cross-threading), then snug it with a 10mm socket.
• Use a torque wrench to finish: Torque to 12 Nm (105 in-lbs).

Step 7: Reconnect the electrical connector

• Push the connector onto the coil until it clicks/locks.
• Give it a gentle tug to confirm it’s secure.

Step 8: Repeat for any other coils you’re replacing

• Replace one coil at a time so connectors and bolts don’t get mixed up.
• One-at-a-time prevents mistakes.

Step 9: Reinstall any covers/ducting and reconnect the battery

• Reinstall any parts you removed using the 10mm socket and 1/4" drive ratchet.
• Reconnect the negative battery cable using the 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth with no shaking.
• If the check-engine light was on for a misfire, it may clear on its own after some driving; if it stays on, a scan tool can clear codes and confirm the fix.
• Take a short test drive and re-check for any warning lights or rough running.
• If you replaced only one coil and misfires return, consider replacing the remaining coils in a set (same age coils often fail close together).

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💰 DIY vs Shop Cost

Shop Cost: $180–$450 (parts + labor, depends on how many coils)

DIY Cost: $35–$300 (parts only, depends on how many coils)

You Save: $145–$150+ by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5–1.0 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.