🔧 HR-V - Spark Plug Replacement

Replacing the spark plugs on your HR-V helps restore smooth starting, fuel economy, and proper engine power. The 1.8L engine uses one ignition coil per spark plug, so each coil is removed first, then each plug is replaced carefully.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• ⚠️ Work only on a completely cool engine. Aluminum cylinder head threads can be damaged if plugs are removed hot.
• ⚠️ Disconnect the negative battery cable to prevent accidental ignition system activation.
• ⚠️ Do not let dirt fall into the spark plug wells. Dirt can enter the engine when the plug is removed.
• ⚠️ Start each new spark plug by hand before using a ratchet. Cross-threading can seriously damage the cylinder head.
• ⚠️ Do not adjust the gap on iridium spark plugs unless the plug manufacturer specifically says to. They are usually pre-gapped.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8-inch drive ratchet
• 3/8-inch drive 6-inch extension
• 5/8-inch spark plug socket
• Torque wrench 5-80 ft-lb range
• Compressed air blow gun
• Dielectric grease
• Clean shop towels
• Needle-nose pliers
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Iridium spark plugs - Qty: 4

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📋 Before You Begin

• Park your HR-V on level ground and set the parking brake.
• Let the engine cool fully before touching the ignition coils or spark plugs.
• Open the hood and remove any loose leaves or debris near the top of the engine.
• Disconnect the negative battery cable using a 10mm socket. The negative cable is usually marked with a minus symbol.
• A spark plug socket is a deep socket with a rubber insert or magnet that holds the spark plug so it does not fall.
• Dielectric grease is a non-conductive silicone grease used lightly inside the ignition coil boot to help prevent moisture and sticking.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the Engine Cover Area Access

• Put on safety glasses and nitrile gloves.
• If any plastic trim or cover is blocking the ignition coils, remove it by hand or with a 10mm socket, depending on what is installed.
• Set fasteners aside in order so they go back in the same places.
• Take a quick phone photo first.

Step 2: Disconnect the First Ignition Coil Connector

• Start with one cylinder at a time so parts do not get mixed up.
• Press the tab on the ignition coil electrical connector with your fingers and pull the connector straight back.
• If the connector is stubborn, use needle-nose pliers gently on the connector body, not the wires.
• An ignition coil is the small electrical part sitting on top of each spark plug.

Step 3: Remove the Ignition Coil

• Use a 10mm socket and 3/8-inch drive ratchet to remove the ignition coil retaining bolt.
• Twist the coil slightly by hand to loosen the rubber boot.
• Pull the ignition coil straight upward and out of the spark plug well.
• Inspect the rubber boot for oil, cracks, burning, or swelling.

Step 4: Clean the Spark Plug Well

• Use a compressed air blow gun to blow dirt away from the spark plug well before removing the plug.
• Keep your face away from the area while blowing debris out.
• Wipe the top area with clean shop towels.
• Clean first, remove second.

Step 5: Remove the Old Spark Plug

• Install the 5/8-inch spark plug socket onto the 3/8-inch drive 6-inch extension.
• Attach the 3/8-inch drive ratchet and lower the socket straight down onto the spark plug.
• Turn counterclockwise slowly to loosen the spark plug.
• Once loose, unscrew it by hand using the extension to avoid damaging the threads.
• Lift the old spark plug out carefully with the 5/8-inch spark plug socket.

Step 6: Install the New Spark Plug by Hand

• Place one new iridium spark plug into the 5/8-inch spark plug socket.
• Lower it straight into the spark plug well using the 3/8-inch drive 6-inch extension.
• Turn the extension clockwise by hand only until the plug seats lightly.
• If it does not turn smoothly, stop and back it out. Start again straight.
• Do not apply anti-seize unless the spark plug manufacturer specifically requires it.

Step 7: Torque the New Spark Plug

• Attach a torque wrench 5-80 ft-lb range to the 3/8-inch drive 6-inch extension and 5/8-inch spark plug socket.
• Tighten the spark plug to Torque to 18 Nm (13 ft-lbs).
• Do not overtighten. The cylinder head is aluminum and the threads can strip.
• Snug is not the same as tight.

Step 8: Reinstall the Ignition Coil

• Apply a very small amount of dielectric grease inside the end of the ignition coil boot.
• Push the ignition coil straight down over the new spark plug until it seats fully.
• Install the coil retaining bolt by hand first.
• Use the 10mm socket and torque wrench 5-80 ft-lb range to tighten the coil bolt to Torque to 12 Nm (9 ft-lbs).

Step 9: Reconnect the Ignition Coil Connector

• Push the electrical connector back onto the ignition coil until it clicks.
• Lightly tug the connector by hand to make sure it is locked.
• Do not pull on the wires.

Step 10: Repeat for the Other Three Spark Plugs

• Repeat Steps 2 through 9 for the remaining three ignition coils and spark plugs.
• Use the same 10mm socket, 5/8-inch spark plug socket, 3/8-inch drive 6-inch extension, and torque wrench 5-80 ft-lb range.
• Replace all four spark plugs during the same service.
• One cylinder at a time prevents mix-ups.

Step 11: Reinstall Any Removed Cover or Trim

• Reinstall any cover or trim removed earlier.
• Use a 10mm socket to snug any cover fasteners if equipped.
• Do not overtighten plastic cover bolts.

Step 12: Reconnect the Battery

• Reconnect the negative battery cable.
• Use a 10mm socket to tighten the battery terminal clamp until secure.
• Make sure the terminal does not rotate by hand.

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✅ After Repair

• Start your HR-V and let it idle for 1-2 minutes.
• The idle may briefly relearn after the battery has been disconnected.
• Listen for smooth running. There should be no shaking, popping, or misfire feeling.
• If the check engine light flashes, shut the engine off and recheck that all ignition coil connectors are fully clicked in.
• Take a short test drive and confirm normal acceleration.
• Reset the clock and radio presets if they were cleared after battery disconnect.

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💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

DIY Cost: $45-$120 (parts only)

You Save: $175-$260 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-1.5 hours.

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🎯 Ready to get started?

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