🔧 F-150 - Ignition Coil Replacement

Your F-150 uses one ignition coil per cylinder (coil-on-plug). Replacing weak or failed coils restores smooth running, power, and helps prevent catalyst-damaging misfires.

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

Assumption: 5.0L V8 coil-on-plug coils with 8mm hold-down bolts.

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely; coils sit on hot valve covers.
• ⚠️ Disconnect the battery negative cable to prevent accidental shorting.
• ⚠️ Do not pull on wiring; release connectors by the lock tab.
• ⚠️ Keep dirt out of spark plug wells; debris can fall into the cylinder.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 8mm socket
• 10mm socket
• Flat trim tool
• Small pick tool
• Torque wrench (in-lb capable)
• Compressed air blow gun
• Shop light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 8 Replace all 8 for best reliability
• Dielectric grease - Qty: 1
• Throttle body/intake tube clamps (optional) - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and remove loose jewelry/metal items.
• Disconnect the battery negative cable using a 10mm socket and tuck it aside so it can’t spring back.
• Lay out coils in order so you don’t mix anything up.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Make room to access the coils

• Remove any intake ducting or covers blocking the coil areas using a flat trim tool and 8mm socket as needed.
• If you loosen the intake tube at the throttle body, use an 8mm socket and gently move the tube aside (do not force it).
• Take a quick photo before moving hoses.

Step 2: Unplug one coil electrical connector

• Work one coil at a time to avoid mistakes.
• Press the connector lock tab and pull the connector straight off.
• If it’s stubborn, use a small pick tool to lift the lock gently. (A pick is a small pointed hand tool used to lift clips without breaking them.)

Step 3: Remove the coil hold-down bolt

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

Step 4: Pull the coil out of the spark plug well

• Twist the coil slightly left-right, then pull straight up by hand.
• If there’s dirt around the opening, blow it away using a compressed air blow gun before fully removing the coil.

Step 5: Prep and install the new coil

• Apply a small dab of dielectric grease inside the new coil boot. (Dielectric grease is a non-conductive grease that helps prevent moisture and makes removal easier.)
• Slide the new coil straight down until it fully seats on the spark plug.
• Install the hold-down bolt by hand first (prevents cross-threading), then snug it with an 8mm socket.
• Torque to 62 in-lb (7 Nm) using a torque wrench (in-lb capable).

Step 6: Reconnect the coil connector

• Push the connector on until it clicks/locks.
• Gently tug to confirm it’s latched.

Step 7: Repeat for the remaining coils

• Repeat Steps 2–6 for each cylinder.
• Use a shop light to confirm every connector is fully seated.

Step 8: Reinstall intake parts and reconnect the battery

• Reinstall any intake ducting/covers you moved using the 8mm socket and flat trim tool.
• Reconnect the battery negative cable using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should be smooth with no shaking.
• Listen for arcing/ticking noises around coils (should be none).
• If you had a check-engine light, it may take a few drive cycles to go off; if it stays on, scan for codes (a misfire code like P030x can point to a connector not fully seated).
• Road test: light throttle, then moderate throttle. Verify no hesitation.

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💰 DIY vs Shop Cost

Shop Cost: $450-$950 (parts + labor)

DIY Cost: $250-$650 (parts only)

You Save: $200-$300 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.