🔧 Ignition Coils - Replacement

The ignition coils on your Explorer sit on top of the engine and fire each spark plug. Replacing a weak coil can fix misfires, rough idle, hesitation, and check engine light codes like P0300-P0306.

Difficulty Level: Intermediate | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• Let the engine cool fully before starting. Coils and the intake area can get hot.
• Disconnect the negative battery cable before removing coil connectors.
• Do not force coil connectors. The locking tabs are easy to break.
• Keep dirt out of the spark plug wells. Debris can cause misfires.
• If one coil failed from oil or water intrusion, inspect the valve cover area and spark plug tube seals first.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• Ratchet
• 3-inch extension
• Trim removal tool
• Flat-blade pick
• Torque wrench
• Dielectric grease
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: Replace as needed, or replace all 6 as a set

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Turn the ignition OFF and remove the key or fob from the vehicle.
• Disconnect the negative battery cable and wait at least 2 minutes before unplugging coils.
• If your Explorer has a check engine light, note the misfire codes before clearing them.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake ducting

• Use a 10mm socket and trim removal tool to remove the engine cover and any intake ducting that blocks access to the coils.
• Lift the engine cover straight up if it uses rubber grommets.
• Keep all clips together.

Step 2: Disconnect the battery

• Use a 10mm socket to loosen the negative battery terminal.
• Move the cable aside so it cannot spring back onto the post.

Step 3: Unplug the ignition coil connectors

• Use your fingers or a flat-blade pick to release the connector lock on each coil.
• Press the release tab and pull the connector straight off.
• Do not pull on the wire itself.

Step 4: Remove the ignition coils

• Use an 8mm socket to remove each coil hold-down bolt.
• Twist the coil gently, then pull it straight up out of the spark plug tube.
• If a coil sticks, wiggle it lightly while pulling upward.
• Do not pry against the valve cover.

Step 5: Inspect the spark plug wells

• Look down each plug tube for oil, coolant, or moisture.
• If you see contamination, fix the leak before installing new coils.
• Wipe the area clean with a dry cloth.

Step 6: Install the new ignition coils

• Apply a small amount of dielectric grease inside each coil boot.
• Set each coil straight into the spark plug tube.
• Press down until the coil seats fully.
• Install the hold-down bolt and tighten with a torque wrench to 7 Nm (62 ft-lbs).

Step 7: Reconnect the coil connectors

• Push each electrical connector on until it clicks.
• Verify the lock tab is fully engaged on every coil.

Step 8: Reinstall removed parts

• Reinstall the intake ducting and engine cover using the 10mm socket and trim removal tool.
• Reattach the negative battery cable with the 10mm socket.
• Check for leftover fasteners.

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✅ After Repair

• Start the engine and listen for smooth idle.
• Check that the check engine light is off.
• If you had misfire codes, clear them with a scan tool and verify they do not return.
• Take a short test drive and make sure acceleration feels normal.

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💰 DIY vs Shop Cost

Shop Cost: $280-$700 (parts + labor)

DIY Cost: $60-$240 (parts only)

You Save: $220-$460 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

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