🔧 F-250 Super Duty - Ignition Coil Replacement

On your F-250 Super Duty, each cylinder has its own ignition coil (coil-on-plug). Replacing a bad coil restores smooth running and prevents misfires that can damage the catalytic converters.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully; coils sit on hot cylinder heads.
• ⚠️ Keep fuel vapors away from sparks; no smoking/open flames.
• ⚠️ Disconnect the negative battery cable before unplugging coil connectors.
• ⚠️ Do not pull on wiring; release connector locks first to avoid damage.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• 1/4" drive ratchet
• 3" extension (1/4" drive)
• 6" extension (1/4" drive)
• Torque wrench (inch-pound or low-range ft-lb)
• Trim clip removal tool
• Small flat-blade screwdriver
• Needle-nose pliers
• Compressed air blow gun
• Shop vacuum
• Clean shop rags
• 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: 8 if replacing all)
• Dielectric silicone grease - Qty: 1
• Ignition coil boot - Qty: 1 (optional, if torn/oil-soaked)

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool completely.
• Use a 10mm socket to disconnect the negative battery cable and tuck it aside so it can’t spring back.
• If you’re only replacing one coil: note which cylinder/coil you’re targeting so you don’t mix up connectors.

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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 release any push clips if present.
• Lift the cover straight up by hand; if it resists, check for hidden fasteners.

Step 2: Locate the coil you’re replacing

• Each ignition coil is mounted on top of the valve cover with an electrical connector and a single retaining bolt.
• Take a quick photo before unplugging anything.

Step 3: Unplug the coil electrical connector

• Release the connector lock using a small flat-blade screwdriver (if equipped), then press the tab and pull the connector straight off.
• Do not yank on the wires—pull on the plastic connector body only.

Step 4: Remove the coil retaining bolt

• Use an 8mm socket with a 1/4" drive ratchet and a 3" extension to remove the bolt.
• Set the bolt aside where it won’t fall into the engine bay.

Step 5: Remove the ignition coil

• Twist the coil slightly by hand to break the seal, then pull straight upward.
• If it’s stubborn, gently wiggle—don’t pry hard against plastic parts.
• Use a compressed air blow gun and/or shop vacuum to remove dirt around the spark plug well so nothing falls in.

Step 6: Prep the new coil

• Apply a pea-sized amount of dielectric silicone grease inside the coil boot (the rubber end). This helps sealing and future removal.
• Dielectric grease is non-conductive; use a thin film.

Step 7: Install the new coil

• Push the coil straight down until it seats fully on the spark plug.
• Install the retaining bolt by hand first to avoid cross-threading.
• Tighten using an 8mm socket and torque wrench: Torque to 8 Nm (71 in-lbs).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks.
• Re-engage the connector lock (if equipped).

Step 9: Reinstall the engine cover

• Press the cover back into its mounts by hand.
• Reinstall any clips using a trim clip removal tool as needed.

Step 10: Reconnect the battery

• Reconnect the negative battery cable using a 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, it may clear after a few drive cycles. If it stays on, you’ll want the codes read to confirm the misfire is gone.
• Road-test for 10-15 minutes and recheck for any stumble under acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $200-$600 (parts + labor, depending on how many coils)

DIY Cost: $40-$400 (parts only, depending on how many coils)

You Save: $160-$200+ by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 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.