🔧 Edge - Ignition Coil Replacement

Your Edge’s ignition coils sit on top of the engine and fire the spark plugs. A weak or failed coil can cause a misfire (rough idle, flashing check-engine light, loss of power), so replacing the bad coil(s) restores smooth running.

Difficulty Level: Beginner | Estimated Time: 0.5-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; coils sit near hot parts.
• ⚠️ If the check-engine light is flashing, avoid driving until repaired (can damage the catalytic converter).
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Don’t pull on wiring—always release the connector lock and pull the connector body.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 1/4" drive ratchet
• 6" extension for 1/4" ratchet
• 8mm socket
• Small flathead screwdriver
• Torque wrench (in-lb or low-range Nm) (specialty)
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 4 if replacing all)
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine fully cool.
• Disconnect the negative battery cable using a 10mm socket.

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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 pull the cover straight up to release the rubber grommets.
• Set it aside where it won’t get stepped on.

Step 2: Locate the ignition coils

• Use a flashlight to find the row of coils on top of the valve cover.
• Each coil has an electrical connector and typically one small retaining bolt.

Step 3: Unplug the coil electrical connector

• Use a small flathead screwdriver to gently lift the connector lock tab if needed.
• Press the release and pull the connector straight off (pull the plastic plug, not the wires).
• If it’s stuck, wiggle—don’t yank.

Step 4: Remove the coil retaining bolt

• Use an 8mm socket with a 1/4" drive ratchet and 6" extension to remove the bolt.
• Keep the bolt somewhere safe (it’s easy to lose).

Step 5: Remove the ignition coil

• Grip the coil and twist slightly left-right to break the seal.
• Pull straight up to remove it from the spark plug well.
• If the rubber boot stayed down in the well, use your fingers to pull it out carefully.

Step 6: Prep the new coil

• Compare the new coil to the old one (same connector and shape).
• Apply a very small smear of dielectric grease inside the rubber boot (dielectric grease is a non-conductive grease that helps prevent moisture and makes future removal easier).
• Use a pea-size amount—don’t pack it.

Step 7: Install the new coil

• Push the coil straight down until it fully seats on the spark plug.
• Install the retaining bolt by hand first to avoid cross-threading.
• Tighten the bolt with an 8mm socket, then use a torque wrench: Torque to 7 Nm (62 in-lbs).

Step 8: Reconnect the coil connector

• Push the connector on until it clicks/locks.
• Gently tug to confirm it’s fully latched.

Step 9: Reassemble and reconnect the battery

• Reinstall the engine cover by lining up the grommets and pushing straight down.
• Reconnect the negative battery cable using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1-2 minutes. It should run smoothly.
• Check that the check-engine light is off and the engine is not shaking.
• If you have a scan tool, clear any stored misfire codes and confirm they don’t return.
• Test drive for 10-15 minutes and re-check for any warning lights.

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💰 DIY vs Shop Cost

Shop Cost: $250-$600 (parts + labor)

DIY Cost: $80-$300 (parts only, depends on 1 coil vs all 4)

You Save: $170-$300+ by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.7-1.2 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.