🔧 Spark Plugs - Replacement

On your F-150, the spark plugs are individual coil-on-plug units, so the job is mostly about gaining access, removing each ignition coil, and swapping the plugs one cylinder at a time. Take your time and keep dirt out of the plug wells so nothing falls into the engine.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• Work on a completely cool engine. Hot aluminum cylinder heads can damage threads.
• Disconnect the negative battery cable before removing coils. This reduces the chance of misfire codes.
• Do not blow debris into the spark plug wells. Clean the area first.
• Do not use anti-seize on new plugs unless the plug manufacturer specifically says to. Most plated plugs do not need it.
• Use a torque wrench. Over-tightening can strip the threads in the cylinder head.

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🔧 Required Tools

You'll need the following tools for this repair:

• 1/4-inch drive ratchet
• 3/8-inch drive ratchet
• 8mm socket
• 10mm socket
• 6-inch extension
• 10-inch extension
• Spark plug socket, 5/8-inch
• Torque wrench
• Flat trim tool
• Needle-nose pliers
• Compressed air or hand blower
• Feeler gauge
• Dielectric grease
• Safety glasses
• Gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs - Qty: 6

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully before starting.
• Open the hood and remove any loose covers or items around the engine bay.
• Disconnect the negative battery cable with the 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake ducting

• Use a flat trim tool or by hand to lift off the engine cover if equipped.
• Use the 8mm socket to loosen the clamps on the air intake tube.
• Disconnect any breather or sensor connectors attached to the intake tube.
• Remove the intake tube to create working room.

Step 2: Disconnect the ignition coils

• Locate the six ignition coils on top of the engine.
• Use your fingers or needle-nose pliers to release each electrical connector tab if needed.
• Unplug each coil connector carefully.
• Keep each coil matched to its cylinder.

Step 3: Remove the ignition coils

• Use the 8mm socket and 3/8-inch ratchet to remove the coil hold-down bolts.
• Twist each coil slightly, then pull it straight up.
• Set the coils aside in order so they go back in the same spots.

Step 4: Clean the spark plug wells

• Use compressed air or a hand blower to clean dirt from each plug well.
• Make sure nothing can fall into the cylinder when the plug comes out.

Step 5: Remove the old spark plugs

• Use the 5/8-inch spark plug socket, extension, and ratchet to loosen each plug.
• Turn slowly at first. If a plug feels tight, work it back and forth gently.
• Remove one plug at a time and compare it to the new one.

Step 6: Prepare and install the new spark plugs

• Check the gap on each new plug with a feeler gauge. Set to the plug spec if adjustment is needed.
• Start each plug by hand using the socket and extension only. This helps prevent cross-threading.
• Once seated by hand, use a torque wrench to tighten each plug to 15 Nm (11 ft-lbs).
• Hand-start every plug.

Step 7: Reinstall the ignition coils

• Apply a small amount of dielectric grease inside each coil boot if desired.
• Push each coil straight down onto its spark plug.
• Install the coil bolts with the 8mm socket and tighten to 10 Nm (89 in-lbs).
• Reconnect each coil electrical connector until it clicks.

Step 8: Reinstall the intake ducting and cover

• Reinstall the intake tube and tighten the clamps with the 8mm socket.
• Reconnect any hoses or sensors you removed.
• 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 smooth operation and check for a rough idle or misfire.
• 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 normal.

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💰 DIY vs Shop Cost

Shop Cost: $300-$600 (parts + labor)

DIY Cost: $60-$180 (parts only)

You Save: $240-$420 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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