🔧 Spark Plugs - Replacement

Replacing the spark plugs on your Tundra means removing the ignition coils, swapping all 8 plugs, and reassembling everything carefully. On the 5.7L V8, the rear bank is tighter, so take your time and keep dirt out of the plug wells.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

---

⚠️ Safety & Precautions

• Let the engine cool completely before starting. Hot aluminum threads can be damaged easily.
• Disconnect the negative battery cable before removing ignition coils.
• Keep dirt, sand, and loose hardware out of the spark plug wells.
• Do not drop anything into the cylinder head openings.
• Use the correct torque. Overtightening can strip the threads in the cylinder head.
• Handle ignition coils gently. Cracked coil boots can cause misfires.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch ratchet
• 3/8-inch torque wrench
• 5/8-inch spark plug socket
• 3-inch extension
• 6-inch extension
• Universal joint (swivel)
• 10mm socket
• 12mm socket
• 8mm socket
• Flat blade screwdriver
• Needle-nose pliers
• Pick tool
• Compressed air
• Dielectric grease
• Safety glasses
• Mechanic gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plug set - Qty: 8
• Engine air filter - Qty: 1

---

📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Disconnect the negative battery cable with a 10mm socket.
• Clean the top of the engine before opening any plug wells. Dirt is the enemy here.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake pieces

• Use a 10mm socket to remove the engine cover fasteners, then lift the cover off.
• If needed for access, use an 8mm socket and a flat blade screwdriver to loosen the air intake duct clamps and remove the duct.
• Set all clamps and hardware aside in order.

Step 2: Remove the ignition coil connectors

• Work on one coil at a time so nothing gets mixed up.
• Use a pick tool or flat blade screwdriver to release each electrical connector tab.
• Pull the connector straight off the coil.

Step 3: Remove the ignition coils

• Use a 10mm socket to remove each ignition coil hold-down bolt.
• Twist the coil slightly, then pull it straight up.
• Inspect each boot for cracks, burns, or oil contamination.

Step 4: Clean the spark plug wells

• Use compressed air to blow dirt out of each well before removing the plug.
• Do this before the plug comes out.
• This helps keep debris out of the cylinder.

Step 5: Remove the old spark plugs

• Use a 5/8-inch spark plug socket, 3-inch extension, 6-inch extension, and universal joint as needed.
• Break each plug loose gently, then back it out slowly.
• If a plug feels stuck, stop and work it back and forth carefully.

Step 6: Inspect and install the new spark plugs

• Verify the new plugs are the correct type and pre-gapped to specification.
• Install each plug by hand first using the 5/8-inch spark plug socket.
• Thread them in several turns by hand before using any ratchet.
• Torque to 18 Nm (13 ft-lbs).
• Hand-start every plug first.

Step 7: Reinstall the ignition coils

• Apply a small amount of dielectric grease inside each coil boot.
• Push each coil straight down onto the new plug until fully seated.
• Install the coil bolts with a 10mm socket.
• Torque to 9 Nm (80 in-lbs).
• Reconnect each electrical connector until it clicks.

Step 8: Reassemble the intake and engine cover

• Reinstall any intake ducting using the 8mm socket and flat blade screwdriver.
• Reinstall the engine cover with the 10mm socket.
• Make sure all clamps are tight and all hoses are seated.

---

✅ After Repair

• Reconnect the negative battery cable with a 10mm socket.
• Start the engine and let it idle.
• Listen for rough idle, ticking, or misfire symptoms.
• If the check engine light is on, scan for misfire codes.
• Take a short test drive and confirm smooth acceleration.

---

💰 DIY vs Shop Cost

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

DIY Cost: $80-$180 (parts only)

You Save: $370-$720 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 hours.

---

🎯 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.