🔧 F-150 - Spark Plug Replacement

You’ll remove the ignition coils (coil-on-plug units) and replace all 8 spark plugs. Fresh plugs help restore smooth idle, power, and fuel economy, and can prevent misfires.

Difficulty Level: Intermediate | Estimated Time: 1.5-3 hours

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⚠️ Safety & Precautions

• 🧯 Work on a fully cool engine to avoid burns and protect the aluminum threads.
• 🧤 Keep dirt out of the plug wells; debris can fall into the cylinder.
• 🔌 Do not pull on wiring; unplug coil connectors by releasing the lock first.
• ⚡ Battery disconnect is not required, but if you’re prone to bumping the starter, disconnect the negative terminal.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 1/4" drive ratchet
• 3/8" drive ratchet
• 3/8" torque wrench (10-30 ft-lbs range)
• 7mm socket
• 8mm socket
• 5/8" spark plug socket (rubber insert)
• 3/8" extension set (3", 6", 12")
• 3/8" universal joint swivel
• Small flathead screwdriver
• Trim clip remover
• Compressed air blow gun
• Shop vacuum
• Flashlight
• Feeler gauge set

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (correct spec for your 6.2L) - Qty: 8
• Dielectric grease - Qty: 1
• Ignition coil boots (optional, if torn/oil-soaked) - Qty: 8

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📋 Before You Begin

• 🅿️ Park on level ground, shift to Park, and set the parking brake.
• 🧊 Let the engine cool completely (at least 1 hour after driving).
• 🧹 Have compressed air ready; you’ll blow out each plug well before removal.
• 🔋 If disconnecting the battery, use an 8mm socket to remove the negative terminal and isolate it.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use your hands to lift the cover straight up (it’s held by rubber grommets), or use an 8mm socket if your cover uses small bolts.
• Set it aside where it won’t get stepped on.

Step 2: Open up access where needed (air intake ducting)

• Use an 8mm socket to loosen the air intake tube clamp(s) if the tube blocks access to the passenger-side front coil.
• Use a trim clip remover to release any push-clips holding ducting in place.
• Move the tube/ducting aside without forcing it.

Step 3: Unplug and remove one ignition coil

• Pick one cylinder to start with and do one plug at a time so nothing gets mixed up.
• Use a small flathead screwdriver to gently lift the connector lock (if present), then unplug the coil connector.
• Use a 7mm socket to remove the coil hold-down bolt.
• Twist the coil boot slightly, then pull the coil straight up and out.
• “Coil-on-plug” means the coil sits directly on the spark plug.
• Torque note (reinstall): Torque to 7 Nm (62 in-lbs)

Step 4: Clean the spark plug well

• Use a shop vacuum to remove loose dirt around the plug well.
• Use compressed air blow gun to blow out the plug well completely.
• This helps prevent debris falling into the cylinder.

Step 5: Remove the old spark plug

• Install the 5/8" spark plug socket on a 3/8" extension and 3/8" ratchet.
• If the angle is tight, add a 3/8" universal joint swivel between the socket and extension.
• Break the plug loose, then spin it out slowly.
• Lift it out using the spark plug socket’s rubber insert.

Step 6: Check and prepare the new spark plug

• Use a feeler gauge set to verify the gap matches the plug spec for your 6.2L (plugs are often pre-gapped, but you should still check).
• Do not put anti-seize on these plugs unless the plug manufacturer specifically instructs it.
• Anti-seize can cause over-tightening.

Step 7: Install the new spark plug (no cross-threading)

• Place the new plug into the 5/8" spark plug socket and lower it into the well.
• Start threading the plug by hand using only the extension (no ratchet at first) until it spins in smoothly.
• Set your 3/8" torque wrench and tighten the plug.
• Torque to 15 Nm (11 ft-lbs)
• If it doesn’t thread easily, back out and retry.

Step 8: Reinstall the ignition coil

• Apply a small dab of dielectric grease inside the end of the coil boot (it helps prevent moisture and makes future removal easier).
• Push the coil straight down until it fully seats on the plug.
• Install the coil bolt using a 7mm socket.
• Torque to 7 Nm (62 in-lbs)
• Reconnect the coil electrical connector until it clicks.

Step 9: Repeat for the remaining 7 cylinders

• Repeat Steps 3–8 for each coil and plug.
• Use your flashlight to confirm every connector is fully seated and every coil bolt is installed.

Step 10: Reinstall intake ducting and engine cover

• Reposition the intake tube/ducting and tighten clamps using an 8mm socket.
• Reinstall any push-clips using your hands or a trim clip remover.
• Reinstall the engine cover by pressing it down onto its grommets.

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✅ After Repair

• 🔍 Start the engine and let it idle for 1–2 minutes; it should run smooth with no flashing check engine light.
• 🧪 If you have a scan tool and had a misfire light before, clear codes and confirm misfire counters stay at zero.
• 🚗 Test drive 10–15 minutes, then recheck that the intake tube clamps are snug.

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💰 DIY vs Shop Cost

Shop Cost: $250-$500 (parts + labor)

DIY Cost: $70-$180 (parts only)

You Save: $180-$320 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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