🔧 Fusion - Spark Plug Replacement

On your Fusion, the spark plugs fire the air/fuel mix in the engine. Worn plugs can cause rough running, reduced mileage, and misfire codes, so replacing them restores smooth performance and efficiency.

Difficulty Level: Intermediate | Estimated Time: 1.0-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine fully cool before starting; plug threads can strip in a hot aluminum head.
• ⚠️ Hybrid system: keep the key/fob away from the car and do not press the Start button while working.
• ⚠️ Disconnect the 12V negative battery cable if you want extra safety against accidental wake-up.
• ⚠️ Do not use anti-seize on modern plated spark plug threads unless a plug maker specifically requires it.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm wrench
• 8mm socket
• 1/4" drive ratchet
• 3/8" drive ratchet
• 6" extension (3/8")
• 12" extension (3/8")
• 5/8" spark plug socket (3/8")
• Torque wrench (inch-pound)
• Torque wrench (foot-pound)
• Compressed air blow gun
• Small flathead screwdriver
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (OEM-equivalent iridium/platinum as specified) - Qty: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Shut the car OFF and keep the key/fob at least 10 feet away.
• Wait 5 minutes so vehicle modules go to sleep.
• If disconnecting the battery: use a 10mm wrench to remove the negative cable and isolate it so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Open the hood and use a flashlight to locate the plastic engine cover on top of the engine.
• Remove the cover (it typically pulls up from rubber grommets). If yours uses fasteners, remove them with an 8mm socket and 1/4" drive ratchet.
• Tip: Pull straight up, not sideways.

Step 2: Unplug and remove the ignition coils

• Each spark plug has an ignition coil on top (a coil is the part that makes the high-voltage spark).
• For each coil connector, lift the lock tab carefully using a small flathead screwdriver, then unplug it by hand.
• Remove the coil hold-down bolt using an 8mm socket and 1/4" drive ratchet.
• Pull the coil straight up and out.
• Torque to 7 Nm (62 in-lbs) when reinstalling the coil bolts.

Step 3: Clean the spark plug wells

• Before removing plugs, blow out dirt around each plug hole using a compressed air blow gun.
• This prevents debris from falling into the cylinder.

Step 4: Remove the old spark plugs

• Use a 5/8" spark plug socket (3/8") with a 6" extension (3/8") and 3/8" drive ratchet to loosen each plug.
• Turn counterclockwise until the plug comes out.
• If a plug feels stuck, stop and work it gently back and forth—don’t force it.

Step 5: Install the new spark plugs

• Start each new plug by hand first (thread it in with just the socket and extension, no ratchet at first).
• Once finger-tight, torque each plug using a torque wrench (foot-pound).
• Torque to 15 Nm (11 ft-lbs).
• Do not adjust the gap on fine-wire iridium plugs unless the plug maker explicitly says it’s allowed.

Step 6: Reinstall coils and connectors

• Apply a very small amount of dielectric grease inside the end of each coil boot.
• Push each coil straight down until fully seated on the spark plug.
• Install the coil hold-down bolt with an 8mm socket and 1/4" drive ratchet, then torque with a torque wrench (inch-pound).
• Torque to 7 Nm (62 in-lbs).
• Reconnect each coil electrical connector until it clicks/locks.

Step 7: Reinstall the engine cover

• Reinstall the engine cover and press it down into place.
• If removed fasteners, tighten using an 8mm socket and 1/4" drive ratchet (snug, not over-tight).

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✅ After Repair

• If you disconnected the battery, reconnect the negative cable using a 10mm wrench.
• Start the car and let it idle for 1-2 minutes; it should run smoothly with no shaking.
• Test drive 10-15 minutes and confirm there’s no check engine light.
• If you had a misfire code before, clear codes with a scan tool and confirm they do not return.

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💰 DIY vs Shop Cost

Shop Cost: ₹6,000-₹12,000 (parts + labor)

DIY Cost: ₹2,500-₹6,000 (parts only)

You Save: ₹3,500-₹6,000 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 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.