🔧 Ignition Coils - Replacement

On your F-150, the ignition coils sit on top of each spark plug and are held in with a small bolt. Replacing them is straightforward once the engine cover is off, and it’s a good time to inspect the plug wells for oil or moisture.

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

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⚠️ Safety & Precautions

• Ignition systems can deliver a strong electrical shock. Keep the key off and the engine cool.
• Let the engine cool completely before starting. Coils and valve covers can be hot.
• Disconnect the negative battery cable before removing coils. This reduces the chance of accidental misfire or electrical damage.
• Do not pull on the coil wire harness. Use the connector release tab instead.
• If you find oil in a spark plug well, stop and inspect the valve cover gasket before installing new coils.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4-inch ratchet
• 6-inch extension
• Torque wrench
• Trim tool
• Needle-nose pliers
• Safety glasses
• Nitrile gloves
• Battery terminal wrench 10mm

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 8 if replacing all coils, or Qty: 1 for a single failed coil
• Dielectric grease - Qty: 1
• Replacement coil bolt - Qty: 8 if any are damaged or corroded

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Turn the ignition off and remove the key or fob from the vehicle.
• Disconnect the negative battery cable using the 10mm battery terminal wrench.
• Label coils if you plan to reuse any.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Lift the engine cover straight up by hand or use the trim tool if it feels stuck.
• Set it aside where it will not get damaged.

Step 2: Disconnect the battery

• Use the 10mm battery terminal wrench to loosen the negative battery terminal.
• Move the cable aside so it cannot spring back and touch the post.

Step 3: Unplug the ignition coil

• At the first coil, press the connector tab and gently unplug the electrical connector by hand.
• If the connector is tight, use needle-nose pliers carefully on the release tab area, not on the wires.
• Work one coil at a time.

Step 4: Remove the coil hold-down bolt

• Use the 8mm socket, 1/4-inch ratchet, and 6-inch extension to remove the coil bolt.
• Keep the bolt and coil together if you are reusing them.
• Torque on installation: 10 Nm (89 in-lbs)

Step 5: Remove the ignition coil

• Twist the coil gently side to side, then pull it straight up.
• If it sticks, rock it lightly. Do not pry hard against the valve cover.
• Inspect the coil boot and the spark plug well for oil, water, or damage.

Step 6: Install the new ignition coil

• Apply a small amount of dielectric grease inside the coil boot.
• Push the new coil straight down onto the spark plug until it seats fully.
• Reinstall the coil bolt by hand first, then tighten with the 8mm socket.
• Torque to 10 Nm (89 in-lbs)

Step 7: Reconnect the electrical connector

• Push the connector on until it clicks.
• Make sure the lock tab is fully seated.

Step 8: Repeat for the remaining coils

• Repeat Steps 3 through 7 for each ignition coil you are replacing.
• Keep the coil locations organized so nothing gets mixed up.

Step 9: Reinstall the engine cover and battery cable

• Press the engine cover back into place by hand.
• Reconnect the negative battery cable and tighten it with the 10mm battery terminal wrench.

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✅ After Repair

• Start the engine and let it idle.
• Listen for a smooth idle and watch for the check engine light.
• If the engine runs rough, recheck the coil connectors and bolt seating.
• If a misfire code was present before repair, clear it with a scan tool and test drive the truck.

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💰 DIY vs Shop Cost

Shop Cost: $360-$900 (parts + labor)

DIY Cost: $160-$520 (parts only)

You Save: $200-$380 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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