🔧 Tundra - Ignition Coil Replacement

Your Tundra uses a coil-on-plug (COP) ignition system, meaning each spark plug has its own ignition coil mounted directly on top. Replacing a bad coil restores smooth idle, power, and prevents misfires that can damage the catalytic converters.

Difficulty Level: Beginner | Estimated Time: 1.0-2.0 hours

Assumption: 5.7L V8 uses 8 COP coils with 10mm hold-down bolts.

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⚠️ Safety & Precautions

• 🛑 Work on a cool engine to avoid burns.
• 🛑 Turn ignition OFF and keep the key/fob away from the truck.
• 🛑 Disconnect the negative battery terminal to prevent accidental shorting.
• 🛑 Do not pull on wiring—release connectors by the lock tab.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 6" socket extension
• Torque wrench (inch-pound or Nm capable)
• Flat trim tool
• Needle-nose pliers
• Shop light
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 8 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 cool fully.
• Use a 10mm socket to disconnect the negative battery terminal and tuck it aside so it can’t spring back.
• If you’re replacing only one coil, note the cylinder location first so you don’t mix parts.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Pull up on the plastic engine cover to release it, or remove fasteners using a 10mm socket if yours is bolted down.
• Set the cover aside where it won’t get stepped on.

Step 2: Create room to access the coils

• If the air intake tube blocks access on the passenger side, loosen the hose clamps using the flat trim tool (or the clamp’s screw head) and reposition the tube.
• Move any wiring clips out of the way using the flat trim tool.

Step 3: Unplug the ignition coil electrical connector

• Press the connector lock tab and pull the connector straight off.
• If it’s stuck, gently help the tab with a flat trim tool—don’t pry hard.

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 1/4" ratchet, and 6" socket extension to remove the single bolt holding the coil down.
• Keep the bolt safe—it’s easy to drop.

Step 5: Remove the ignition coil

• Twist the coil slightly left-right, then pull straight up to remove it from the spark plug tube.
• If it fights you, twist more—don’t yank.

Step 6: Prep and install the new coil

• Put a small dab of dielectric grease inside the rubber boot of the new coil. (Dielectric grease is a non-conductive grease that helps keep moisture out and prevents the boot from sticking.)
• Push the new coil straight down until you feel it fully seat on the spark plug.

Step 7: Reinstall and torque the coil bolt

• Thread the bolt in by hand first to avoid cross-threading.
• Use a torque wrench with a 10mm socket to tighten: Torque to 9 Nm (80 in-lbs).

Step 8: Reconnect the coil connector and repeat as needed

• Push the connector on until it clicks/locks.
• Repeat Steps 3–7 for any other coils you’re replacing.
• Replace coils one at a time to avoid mix-ups.

Step 9: Reassemble intake/cover and reconnect battery

• Reinstall the intake tube and tighten clamps using the flat trim tool (or clamp screw head).
• Reinstall the engine cover.
• Reconnect the negative battery terminal using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should idle smoothly.
• Listen for clicking, arcing, or a “dead miss.” If present, shut it off and re-check that the coil is fully seated and the connector is clicked in.
• If the check engine light was on for a misfire, use a scan tool to clear codes and confirm they don’t return after a short test drive.
• Do a 10–15 minute road test with light and moderate acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $200-$650 (parts + labor, depending on how many coils)

DIY Cost: $40-$480 (parts only, depending on how many coils)

You Save: $160-$170 by doing it yourself! (single coil example)

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 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.