🔧 Spark Plugs - Replacement

Your Camry uses six iridium spark plugs, one per cylinder. On the V6, the front bank is easier to reach, while the rear bank takes more time because of the engine layout. Replacing all six at the same time keeps the engine running smoothly and helps avoid misfires.

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

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⚠️ Safety & Precautions

• Work on a cool engine only. Hot aluminum threads can strip easily.
• Disconnect the negative battery terminal before unplugging ignition coils.
• Keep dirt out of the spark plug wells. Debris can fall into the cylinders.
• Do not use anti-seize on Toyota iridium spark plug threads unless the plug maker specifically says to.
• Handle coil connectors and harnesses gently. Do not yank on the wires.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 8mm socket
• Ratchet
• 3-inch extension
• 6-inch extension
• Spark plug socket, 5/8-inch
• Torque wrench
• Trim clip removal tool
• Flat blade screwdriver
• Needle-nose pliers
• Fender cover
• Safety glasses
• Gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs, iridium - Qty: 6
• Ignition coil boot seals - Qty: 6
• Throttle body gasket - Qty: 1
• Intake manifold gasket set - Qty: 1

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📋 Before You Begin

• Park on a level surface and set the parking brake.
• Let the engine cool completely.
• Disconnect the negative battery cable before starting.
• Work cleanly so no dirt drops into the plug holes.
• Label coils if you move them around.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake duct

• Use your hands to lift off the plastic engine cover.
• Use an 8mm socket and ratchet to remove the air intake duct clamps and fasteners.
• Move the duct out of the way for access to the rear of the engine.

Step 2: Disconnect the battery

• Use a 10mm socket to remove the negative battery terminal.
• Move the cable aside so it cannot touch the post.

Step 3: Remove ignition coils

• Use a 10mm socket to remove each ignition coil bolt.
• Unplug each coil connector by pressing the lock tab first.
• Pull each coil straight up. A slight twist helps if the boot is stuck.
• Do not pry hard on the coil body.

Step 4: Clean the spark plug wells

• Use compressed air if available, or a clean vacuum nozzle, to remove dirt from each well.
• This keeps debris out of the cylinders when the plugs are removed.

Step 5: Remove the old spark plugs

• Use a 5/8-inch spark plug socket with an extension and ratchet to loosen each plug.
• Turn counterclockwise to remove each one carefully.
• If a plug feels tight, work it back and forth gently instead of forcing it.

Step 6: Check and install the new spark plugs

• Compare each new plug to the old one to confirm the same reach and thread size.
• Install each plug by hand first using the spark plug socket and extension.
• Once seated by hand, use a torque wrench to tighten to 18 Nm (13 ft-lbs).
• Hand-starting prevents cross-threading.

Step 7: Reinstall ignition coils

• Inspect each coil boot for tears, burns, or oil contamination.
• Push each coil straight down onto its spark plug.
• Install the coil bolts with a 10mm socket and tighten to 9 Nm (80 in-lbs).
• Reconnect each electrical connector until it clicks.

Step 8: Reassemble the intake parts

• Reinstall the intake duct, clamps, and any removed fasteners using an 8mm socket.
• Reinstall the engine cover by pressing it into place.
• Reconnect the negative battery terminal with a 10mm socket and tighten snugly.

Step 9: Start and check your work

• Start the engine and let it idle.
• Listen for rough running or misfires.
• Make sure no warning lights are on.
• If the check engine light comes on, scan for misfire codes.

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✅ After Repair

• Take a short test drive and confirm smooth acceleration.
• Recheck that all coil connectors and fasteners are secure.
• If the plugs were badly worn, idle quality may improve immediately.
• Replace all six plugs together for the best result.

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💰 DIY vs Shop Cost

Shop Cost: $350-$650 (parts + labor)

DIY Cost: $60-$180 (parts only)

You Save: $290-$470 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 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.