🔧 Spark Plugs - Replacement

Your Explorer uses turbocharged direct-ignition spark plugs, so the job is mostly about getting clean access, removing the ignition coils, and installing the new plugs carefully. Work with the engine fully cool so the plugs thread in smoothly and to avoid damage to the aluminum cylinder head.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Hot plugs and coils can burn you and damage threads.
• Do not cross-thread the new spark plugs. Start each plug by hand first.
• Use only a spark plug socket with a rubber insert or magnet.
• Keep dirt out of the plug wells. Debris can fall into the cylinders.
• No battery disconnect is required for this job, but turn the ignition fully off and keep the key/fob away from the vehicle.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch ratchet
• 3/8-inch extension set
• 5/8-inch spark plug socket
• 7mm socket
• Torque wrench
• Trim tool
• Compressed air nozzle (specialty)
• Feeler gauge
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plug set - Qty: 4

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Open the hood and remove any engine cover or intake snorkel pieces blocking access.
• Work one cylinder at a time so you do not mix up coil connectors.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and gain access

• Use your hands or a trim tool to lift off the engine cover if equipped.
• If the air inlet tube blocks access, loosen the clamps with the correct socket or screwdriver and move it aside.
• Keep all fasteners in a tray.

Step 2: Clean around the spark plug wells

• Use a compressed air nozzle to blow dirt away from each ignition coil and plug well.
• This helps keep debris out of the cylinder head.

Step 3: Remove the ignition coils

• Use a 7mm socket and 3/8-inch ratchet to remove each coil hold-down bolt.
• Unplug the coil electrical connector by pressing the tab and pulling straight back.
• Twist each coil gently, then pull it straight up.
• Do not yank on the wire.

Step 4: Remove the old spark plugs

• Use a 5/8-inch spark plug socket, 3/8-inch extension set, and 3/8-inch ratchet to loosen each plug.
• Turn each plug out slowly by hand once it breaks loose.
• Check each old plug for heavy oil, broken porcelain, or unusual wear.

Step 5: Check and prepare the new plugs

• Compare the new plugs to the old ones to make sure they match.
• Check the gap with a feeler gauge if needed. Do not force the fine ground strap.
• Most new plugs are pre-gapped.

Step 6: Install the new spark plugs

• Thread each plug in by hand first using the 5/8-inch spark plug socket and extension.
• If a plug does not spin in easily, back it out and start again.
• Once seated, torque each plug to 13 Nm (115 in-lbs).

Step 7: Reinstall the ignition coils

• Push each coil straight down onto its spark plug until fully seated.
• Reconnect each electrical connector until it clicks.
• Install the coil bolts with the 7mm socket.
• Torque the coil bolts to snug only unless your service data specifies otherwise.

Step 8: Reassemble the intake and engine cover

• Reinstall any intake tube or ducting you removed.
• Reinstall the engine cover by pressing it into place.
• Make sure no tools are left in the engine bay.

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✅ After Repair

• Start the engine and let it idle.
• Listen for a smooth idle and watch for any check engine light.
• If the engine runs rough, recheck all coil connectors and plug seating.
• Take a short test drive and confirm normal acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $220-$420 (parts + labor)

DIY Cost: $40-$120 (parts only)

You Save: $180-$300 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?

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.