🔧 Fusion - Ignition Coil Replacement

Your Fusion’s ignition coils sit on top of the spark plugs and create the high-voltage spark needed to run smoothly. Replacing a weak or failed coil can fix misfires, rough idle, flashing check-engine light, and poor acceleration.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep the key out of the car so the ignition can’t be turned on.
• ⚠️ If you disconnect the battery, you may reset radio presets.
• ⚠️ Don’t pull on wiring; press the connector tab and pull the plug body.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4" drive ratchet
• 1/4" drive extension (3"-6")
• Torque wrench (inch-pound)
• Flat trim tool
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 4 Replace all four for best reliability
• Dielectric grease - Qty: 1
• Anti-seize compound - Qty: 1 Only if plug maker allows it
• Spark plugs - Qty: 4 Optional but smart if due

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and let the engine cool fully.
• If you want extra safety, disconnect the negative battery cable using an 8mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Grab the cover firmly and pull upward to release it from the rubber grommets.
• If any corner feels stuck, gently help it up using a flat trim tool.

Step 2: Unplug the ignition coil electrical connector

• At the top of each coil, press the connector lock tab and pull the connector straight back.
• Wiggle the plug, not the wires.

Step 3: Remove the coil hold-down bolt

• Use an 8mm socket with a 1/4" drive ratchet and 1/4" drive extension (3"-6") to remove the bolt that holds the coil to the valve cover.
• Set the bolt aside where it won’t fall into the engine bay.

Step 4: Remove the ignition coil

• Twist the coil slightly left/right to break the seal, then pull straight up to remove it.
• If it’s stubborn, pull upward while twisting gently—don’t pry hard on the valve cover.

Step 5: Prep and install the new coil

• Put a small pea-sized amount of dielectric grease inside the rubber boot of the new coil.
• Dielectric grease helps prevent moisture and sticking.
• Push the coil straight down onto the spark plug until it fully seats.

Step 6: Reinstall the hold-down bolt and torque it

• Start the bolt by hand first (to avoid cross-threading), then snug it with an 8mm socket.
• Use a torque wrench (inch-pound) to tighten the coil bolt: Torque to 7 Nm (62 in-lbs / 5 ft-lbs).

Step 7: Reconnect the electrical connector

• Push the connector onto the coil until it clicks/locks.
• Gently tug the connector to confirm it’s fully seated.

Step 8: Repeat for the remaining coils

• Do one coil at a time so connectors and bolts don’t get mixed up.

Step 9: Reinstall the engine cover

• Line up the cover grommets and press down firmly until it snaps in place.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should idle smoothly.
• If the check-engine light was on, scan and clear codes (if you have a scan tool). If it returns, re-check connector seating.
• Road test for 10 minutes with light and moderate acceleration. Watch for hesitation or flashing check-engine light.
• If you disconnected the battery, reset clock and radio presets as needed.

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💰 DIY vs Shop Cost

Shop Cost: $250-$550 (parts + labor)

DIY Cost: $120-$320 (parts only)

You Save: $130-$230 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.