🔧 Ignition Coils - Replacement

The ignition coils on your F-150 mount on top of each spark plug and send high voltage to fire the plugs. Replacing weak coils can fix misfires, rough idle, hesitation, and check-engine lights. This job is straightforward, but keep the work area clean so dirt does not fall into the spark plug tubes.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• Work on a cold engine only. Coils and valve covers can get hot.
• Disconnect the negative battery cable before starting to reduce the chance of electrical damage.
• Do not pull on the wiring; release each connector lock first.
• Keep dirt and water out of the spark plug wells.
• If a coil has caused repeated misfires, inspect the spark plugs too.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• Ratchet
• 6-inch extension
• Trim tool
• Dielectric grease
• Safety glasses
• Mechanic gloves
• Torque wrench

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil set - Qty: 8

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📋 Before You Begin

• Park on a level surface and set the parking brake.
• Let the engine cool completely.
• Disconnect the negative battery cable before touching any coil connectors.
• Tip: Replace coils one bank at a time.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect battery power

• Use a 10mm socket to loosen the negative battery cable clamp.
• Remove the cable from the battery and secure it so it cannot spring back.

Step 2: Remove engine cover

• If equipped, lift off the plastic engine cover by hand or remove any retaining fasteners with an 8mm socket.
• Set the cover aside in a safe spot.

Step 3: Unplug the first ignition coil

• Locate the coil on top of the valve cover near each spark plug.
• Use a trim tool to gently release the connector lock if needed.
• Press the tab and unplug the electrical connector by hand.

Step 4: Remove the coil hold-down bolt

• Use an 8mm socket and ratchet to remove the coil bolt.
• Keep the bolt organized so it goes back in the same spot.

Step 5: Remove the old ignition coil

• Pull the coil straight up and out of the spark plug tube.
• If it sticks, twist it slightly while pulling upward.
• Tip: Do not pry on the valve cover.

Step 6: Install the new ignition coil

• Lightly apply dielectric grease inside the coil boot.
• Push the new coil straight down until it fully seats on the spark plug.
• Reinstall the hold-down bolt with the 8mm socket.
• Torque to 8 Nm (71 ft-lbs).

Step 7: Reconnect the electrical connector

• Push the connector on until it clicks.
• Make sure the lock is fully seated.

Step 8: Repeat for the remaining coils

• Move cylinder by cylinder and repeat the same removal and installation steps.
• Keep each connector and bolt with its matching coil area.

Step 9: Reinstall the engine cover and battery cable

• Reinstall the engine cover by hand or with the 8mm socket if fasteners were removed.
• Reconnect the negative battery cable with the 10mm socket.
• Tighten the clamp snugly.

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✅ After Repair

• Start the engine and let it idle.
• Listen for smooth running and check for warning lights.
• If the check-engine light was on, clear codes with a scan tool and confirm no misfire returns.
• If one coil failed, inspect the related spark plug for wear or oil contamination.

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💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $160-$400 (parts only)

You Save: $290-$500 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

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