🔧 Spark Plugs - Replacement

Your Accord’s V6 uses six spark plugs, and the front and rear banks need a little different access. The job is mostly careful disassembly, then removing and installing the plugs one cylinder at a time so you do not mix parts or damage threads.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Hot cylinder head threads can strip or seize.
• Do not blow debris into the spark plug wells with compressed air unless you can keep dirt out of the engine.
• Do not overtighten the new plugs. The cylinder head is aluminum.
• Battery disconnect is not required, but keep the ignition off the whole time.
• Work on one cylinder at a time.

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🔧 Required Tools

You'll need the following tools for this repair:

• 5/8" spark plug socket
• 3/8" drive ratchet
• 3" extension
• 6" extension
• 10mm socket
• Torque wrench
• Flat-blade screwdriver
• Trim panel tool
• Needle-nose pliers
• Dielectric grease
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plug set - Qty: 6

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Open the hood and make sure the engine bay is clean.
• Keep dirt away from the plug wells.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Pull the engine cover straight up to release it from the rubber grommets.
• Set it aside where it will not get damaged.

Step 2: Remove the air intake duct

• Use the Flat-blade screwdriver to loosen the air intake clamps.
• Disconnect the intake duct and move it out of the way.
• If any hose clips are in the way, use the Trim panel tool to release them.

Step 3: Remove the rear wiper cowl access panel

• Use the Trim panel tool to remove the cowl fasteners and push clips at the rear of the engine bay.
• Lift the rear access cover to reach the rear bank ignition coils.
• Set clips in a tray so they do not disappear.

Step 4: Remove the ignition coils

• Use the 10mm socket to remove each coil hold-down bolt.
• Press the release tab on each coil connector and unplug it.
• Twist each coil gently, then pull it straight up and out.
• Keep each coil in order so it goes back to the same cylinder.

Step 5: Remove the old spark plugs

• Use the 5/8" spark plug socket, 3" extension, and 3/8" drive ratchet to loosen each plug.
• Turn counterclockwise until each plug comes free.
• Lift each plug out carefully so you do not drop dirt into the cylinder.

Step 6: Install the new spark plugs

• Start each plug by hand using the 5/8" spark plug socket and extensions.
• Thread each plug in several turns by hand before using any ratchet force.
• Use the torque wrench to tighten each plug to 18 Nm (13 ft-lbs).
• Do not use anti-seize unless the plug manufacturer specifically says to.
• Hand-start every plug first.

Step 7: Reinstall the ignition coils

• Add a small amount of dielectric grease inside each coil boot if desired.
• Push each coil straight down until it seats fully on the plug.
• Reinstall the coil bolts with the 10mm socket and tighten snugly.
• Reconnect each electrical connector until it clicks.

Step 8: Reassemble the intake and cowl parts

• Reinstall the rear access cover and push clips using the Trim panel tool.
• Reinstall the intake duct and tighten the clamps with the Flat-blade screwdriver.
• Press the engine cover back into place.

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✅ After Repair

• Start the engine and let it idle for about one minute.
• Check for rough idle, misfire, or warning lights.
• Listen for vacuum leaks or loose intake parts.
• If it runs rough, recheck coil connectors and plug seating.
• A smooth idle is the goal.

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💰 DIY vs Shop Cost

Shop Cost: $280-$500 (parts + labor)

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

You Save: $220-$320 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

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