🔧 Spark Plugs - Replacement

Your engine uses four spark plugs mounted in the cylinder head under the ignition coil packs. Replacing them restores ignition performance, helps fuel economy, and can fix misfires or rough idle when the plugs are worn.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Hot aluminum threads can be damaged easily.
• Disconnect the negative battery cable if you want extra safety around the ignition system.
• Do not drop debris into the spark plug wells. Clean around each coil before removal.
• Use care with the coil connectors. Breakage here is common if pulled by the wire.
• Do not over-tighten the plugs. The cylinder head threads can be damaged.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive ratchet
• 5/8-inch spark plug socket
• 6-inch extension
• 10mm socket
• Torque wrench
• Flat-blade trim tool
• Compressed air or vacuum
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plug set - Qty: 4

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Make sure the engine is fully cool.
• If you disconnect the battery, save radio and clock settings first.
• Work one cylinder at a time so the coil and plug locations stay organized.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Lift the engine cover straight up by hand. It is held on by rubber grommets.
• If it feels stuck, wiggle gently. Do not pry hard.

Step 2: Access the ignition coils

• Locate the four ignition coils on top of the engine.
• Use a 10mm socket to remove the coil hold-down bolts.
• Unplug each coil electrical connector by pressing the tab and pulling straight back.
• Lift each coil out carefully.

Step 3: Clean the plug wells

• Use compressed air or a vacuum to remove dirt from around each spark plug well.
• This keeps debris from falling into the cylinder.
• Clean first, remove later.

Step 4: Remove the old spark plugs

• Use a 5/8-inch spark plug socket, 6-inch extension, and 3/8-inch drive ratchet to remove each spark plug.
• Turn counterclockwise to loosen.
• If a plug feels tight, work it gently. Do not force it.

Step 5: Check and install the new spark plugs

• Verify the new plugs are correct for your engine.
• Check the plug gap if needed. The correct gap is typically 0.040 in (1.0 mm).
• Install each plug by hand first using the spark plug socket and extension.
• Once finger-tight, use a torque wrench and tighten to 25 Nm (18 ft-lbs).
• Hand-start every plug.

Step 6: Reinstall the ignition coils

• Push each coil fully onto its spark plug.
• Reconnect each electrical connector until it clicks.
• Install the coil bolts with a 10mm socket.
• Tighten the coil bolts snugly. Do not overtighten.

Step 7: Reinstall the engine cover

• Align the cover with the mounting points.
• Press down evenly until it snaps into place.

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✅ After Repair

• Start the engine and let it idle.
• Listen for smooth operation and check for misfire warning lights.
• If the check engine light was on before, clear codes if needed with a scan tool.
• Test drive gently and confirm there is no hesitation.

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💰 DIY vs Shop Cost

Shop Cost: $180-$320 (parts + labor)

DIY Cost: $40-$90 (parts only)

You Save: $140-$230 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

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