🔧 Ignition Coils - Replacement

The ignition coils sit on top of the spark plugs and create the spark that lights the engine. Replacing a weak coil can fix misfires, rough idle, hard starting, and check engine lights.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. The valve cover and coils can get hot.
• Turn the ignition OFF and remove the key before unplugging any coil connectors.
• Disconnect the negative battery cable if you want extra safety while working around the ignition system.
• Do not pull on the wiring. Press the connector tab first, then unplug it.
• Keep dirt and debris out of the spark plug wells.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4-inch ratchet
• 6-inch extension
• Trim tool
• Needle-nose pliers
• Torque wrench
• Gloves
• Safety glasses
• Shop towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 4

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Turn the ignition off and open the hood.
• If the engine is hot, wait until it is cool to the touch.
• If you are replacing all four coils, work one at a time so the connectors and parts stay organized.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket to loosen the negative battery terminal.
• Move the cable aside so it cannot touch the terminal.
• Keep the cable from springing back.

Step 2: Remove the engine cover

• Lift the engine cover straight up by hand to release it from its mounting posts.
• Set it aside in a safe place.

Step 3: Unplug the ignition coil connector

• Find the ignition coil on top of the engine, directly above each spark plug.
• Use your fingers or a trim tool to press the connector lock tab.
• Pull the connector straight off the coil.
• Press the tab before pulling.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket and 1/4-inch ratchet to remove the coil bolt.
• Keep the bolt in a safe spot.

Step 5: Remove the ignition coil

• Twist the coil gently if it feels stuck.
• Pull the coil straight up out of the spark plug well.
• Use needle-nose pliers only if needed to help lift the rubber boot area carefully.
• Check the old coil for oil, cracks, or burned marks.

Step 6: Install the new ignition coil

• Slide the new coil straight down into the spark plug well until it seats fully.
• Reinstall the hold-down bolt by hand first.
• Use a torque wrench with a 10mm socket to tighten the bolt to 9 Nm (80 in-lbs).

Step 7: Reconnect the coil connector

• Push the electrical connector onto the coil until it clicks.
• Lightly tug it to make sure it is locked in place.

Step 8: Reinstall the engine cover and battery cable

• Press the engine cover back onto its mounting posts.
• Reconnect the negative battery cable with a 10mm socket.
• Tighten it snugly.

Step 9: Repeat for other coils if needed

• Replace the remaining coils one at a time using the same steps.
• If one coil failed from age, replacing all four can help prevent future misfires.

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✅ After Repair

• Start the engine and listen for smooth idle.
• Watch for the check engine light.
• If the light was on before, clear the code with a scan tool and confirm it does not return.
• If the engine still misfires, the spark plugs may also need inspection.

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💰 DIY vs Shop Cost

Shop Cost: $220-$520 (parts + labor)

DIY Cost: $80-$240 (parts only)

You Save: $140-$280 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

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