🔧 Spark Plugs - Replacement

Your F-150 uses individual ignition coils on top of each spark plug. This job is straightforward, but the aluminum cylinder heads mean the plugs must be removed and installed carefully to avoid thread damage.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Hot aluminum threads can be damaged easily.
• Disconnect the negative battery cable before removing ignition coils.
• Keep dirt out of the spark plug wells. Debris can fall into the cylinders.
• Do not overtighten the spark plugs. Use a torque wrench.
• Work on one cylinder at a time.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• 3/8-inch ratchet
• 3/8-inch extension set
• 5/8-inch spark plug socket
• Torque wrench
• Flat-head screwdriver
• Dielectric grease
• Compressed air
• Safety glasses
• Gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs - Qty: 8
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Disconnect the negative battery cable using the 10mm socket.
• Remove any engine cover if equipped.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect battery power

• Use the 10mm socket to remove the negative battery cable.
• Move the cable aside so it cannot touch the battery terminal.

Step 2: Remove the engine cover

• If equipped, pull the engine cover straight up by hand.
• Set it aside in a safe place.

Step 3: Remove ignition coil from cylinder 1

• Use the 8mm socket to remove the coil hold-down bolt.
• Unplug the ignition coil connector by pressing the release tab.
• Twist the coil gently and pull it straight up.

Step 4: Remove the spark plug

• Use compressed air to blow dirt away from the plug well before removal.
• Use the 5/8-inch spark plug socket, extension, and ratchet to remove the plug.
• If the plug feels stuck, work it out slowly to avoid breaking it.

Step 5: Install the new spark plug

• Thread the new plug in by hand first using the spark plug socket and extension.
• Once seated, tighten with a torque wrench to 13 Nm (115 in-lbs).
• Hand-start every plug.

Step 6: Reinstall the ignition coil

• Apply a small amount of dielectric grease inside the coil boot.
• Push the coil down until it seats fully on the spark plug.
• Reinstall the coil bolt with the 8mm socket and tighten to 8 Nm (71 in-lbs).
• Reconnect the coil electrical connector.

Step 7: Repeat for the remaining cylinders

• Repeat Steps 3 through 6 for all 8 spark plugs.
• Work one cylinder at a time so parts stay organized.

Step 8: Reassemble and reconnect battery

• Reinstall the engine cover if equipped.
• Reconnect the negative battery cable with the 10mm socket.

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✅ After Repair

• Start the engine and let it idle.
• Listen for misfires, rough idle, or ticking sounds.
• Check that all coil connectors are fully locked in place.
• If the check engine light is on, scan for codes and clear them after confirming the repair.
• Take a short test drive and make sure acceleration feels smooth.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $40-$140 (parts only)

You Save: $210-$310 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

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