🔧 Forte - Ignition Coil Replacement

Your Forte uses coil-on-plug ignition coils (one coil per spark plug). Replacing a weak coil can fix misfires, rough running, and a flashing check-engine light.

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

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before starting (hot exhaust/valve cover burns).
• ⚠️ Turn ignition OFF and keep the key/fob away from the car while unplugging coils.
• ⚠️ If you disconnect the battery, you may reset radio presets and clock.
• ⚠️ Don’t pull on the wiring—only on the connector body and the coil.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• Torque wrench (in-lb or small ft-lb range)
• Small flathead screwdriver
• Nitrile gloves
• Safety glasses
• Shop towels

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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 (small packet/tube)

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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 cool completely.
• 🧰 Optional but recommended: disconnect the negative battery terminal using a 10mm socket.
• 🧰 Decide your approach: replace only the failed coil, or replace all coils if mileage is high and you want even wear.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• 🛠️ Lift up on the plastic engine cover to pop it off its mounting grommets (use your hands).
• 🛠️ Set it aside where it won’t get stepped on.

Step 2: Locate the ignition coils

• 🛠️ Look on top of the valve cover for the row of coil packs (one per cylinder) with electrical connectors.
• 🛠️ If you’re only replacing one coil, identify the correct cylinder first (misfire codes usually point to a cylinder).

Step 3: Unplug the coil electrical connector

• 🛠️ Press the connector lock tab and pull the connector straight off.
• 🛠️ If it’s stuck, use a small flathead screwdriver gently on the lock tab—don’t pry on wires.

Step 4: Remove the coil hold-down bolt

• 🛠️ Use a 10mm socket, 1/4" ratchet, and 6" extension to remove the coil bolt.
• 🛠️ Keep the bolt somewhere safe so it doesn’t fall into the engine bay.

Step 5: Remove the ignition coil

• 🛠️ Grab the coil body and twist slightly left-right while pulling upward to release the rubber boot from the spark plug.
• 🛠️ Inspect for oil inside the spark plug tube (oil can cause misfires and may indicate a valve cover gasket leak).

Step 6: Install the new coil

• 🛠️ Apply a tiny 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 spark plug.
• 🛠️ Reinstall the hold-down bolt by hand first to avoid cross-threading.
• 🛠️ Tighten the bolt with a torque wrench: Torque to 9.8 Nm (7.2 ft-lbs).

Step 7: Reconnect the electrical connector and reassemble

• 🛠️ Push the connector on until it clicks and locks.
• 🛠️ Reinstall the engine cover by pressing it down onto the grommets (hands only).
• 🛠️ If you disconnected the battery, reconnect the negative terminal using a 10mm socket.

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✅ After Repair

• ✅ Start the engine and listen for a smooth idle (no shaking).
• ✅ If the check-engine light was on, it may take a few drive cycles to clear; a scan tool can clear it immediately.
• ✅ Road test for 10–15 minutes and confirm no hesitation under light acceleration.
• ✅ If the misfire returns, the next common checks are spark plugs and oil in the plug tubes.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor, depending on how many coils)

DIY Cost: $35-$280 (parts only)

You Save: $145-$170+ 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?

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.