🔧 Ignition Coils - Replacement

On your F-350, each cylinder uses a coil-on-plug ignition coil that sits directly on top of the spark plug. Replacing a bad coil is straightforward: you’ll unplug the electrical connector, remove the coil hold-down bolt, and swap the coil.

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

Assumption: Coil hold-down bolt is the common small Ford fastener; verify socket fit before forcing.

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns.
• ⚠️ Keep the key out of the truck so the ignition can’t be turned on.
• 🔌 Disconnect the negative battery cable if you’ll be unplugging multiple coils or working near the starter/alternator wiring.
• 🧯 Don’t use open flame; fuel vapors may be present around the intake area.

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🔧 Required Tools

You'll need the following tools for this repair:

• 🧰 1/4" drive ratchet
• 🧰 6" 1/4" drive extension
• 🧰 7mm socket
• 🧰 8mm socket
• 🧰 10mm socket
• 🧰 Torque wrench (in-lb)
• 🧰 Pick tool
• 🧰 Trim clip tool
• 🧰 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: 8 if replacing all)
• 🧴 Dielectric grease - Qty: 1

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📋 Before You Begin

• 🅿️ Park on level ground, shift to Park, and set the parking brake.
• 🔑 Turn ignition OFF and remove the key.
• 🔌 If disconnecting the battery: use a 10mm socket to remove the negative cable and tuck it aside so it can’t spring back.
• 🏷️ If you’re only replacing one coil, note which cylinder/coil you’re changing so you don’t mix parts.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open access to the coils

• Use a flashlight to locate the ignition coils on top of each valve cover (one coil per cylinder).
• If any intake ducting or covers block access, remove the fasteners with a trim clip tool and/or the appropriate socket, then move the piece aside carefully.

Step 2: Unplug the coil electrical connector

• Press the connector lock tab by hand; if it’s stubborn, use a pick tool gently to lift the lock without breaking it.
• Pull the connector straight off the coil (don’t yank on the wires).

Step 3: Remove the coil hold-down bolt

• Use a 7mm socket (or 8mm socket if that’s the correct fit) with a 1/4" drive ratchet and 6" extension to remove the coil bolt.
• Set the bolt aside where it can’t fall into the engine bay.

Step 4: Remove the ignition coil

• Twist the coil slightly by hand to break the seal of the rubber boot, then pull straight upward to remove it.
• If it’s stuck, twist—don’t pry hard.

Step 5: Prep the new coil

• Apply a small pea-sized amount of dielectric grease inside the end of the coil boot (dielectric grease is a non-conductive silicone grease that helps prevent moisture and makes future removal easier).
• Compare the new coil to the old coil to ensure the connector and boot match.

Step 6: Install the new coil

• Push the coil straight down onto the spark plug until it fully seats.
• Reinstall the hold-down bolt by hand first to avoid cross-threading.
• Tighten using a torque wrench (in-lb) to Torque to 7 Nm (62 in-lbs).

Step 7: Reconnect the electrical connector

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

Step 8: Repeat for any other coils

• Repeat Steps 2–7 for each additional coil you’re replacing.
• Replace in pairs per bank for consistency.

Step 9: Reinstall any removed covers/ducting

• Reinstall any intake ducting/covers you removed using the same socket or trim clip tool.
• If you disconnected the battery, reconnect the negative cable using a 10mm socket and snug it securely.

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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, use a scan tool to clear codes and confirm none return after a short drive.
• ✅ Road test: light acceleration first, then moderate acceleration; verify no misfire, flashing check engine light, or fuel smell.

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💰 DIY vs Shop Cost

Shop Cost: $250-$650 (parts + labor)

DIY Cost: $40-$450 (parts only)

You Save: $150-$250 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.