🔧 Ignition Coils - Replacement

The ignition coils on your Land Cruiser sit on top of the spark plugs and send high voltage to each cylinder. If one fails, you may get a misfire, rough idle, poor fuel economy, or a check engine light.

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

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Coils and nearby parts can stay hot.
• Turn the ignition OFF and keep the key/fob away from the vehicle.
• Disconnect the negative battery cable before unplugging coils. This helps prevent electrical damage.
• Use care around the coil connectors. Do not pull on the wires.
• If you find oil in the spark plug wells, fix the leak first. New coils can fail early if oil contamination stays in the wells.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• Ratchet
• 6-inch extension
• Torque wrench
• Flat-blade trim tool
• Needle-nose pliers
• Dielectric grease
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil set - Qty: 8
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on a level surface and set the parking brake.
• Let the engine cool fully.
• Open the hood and remove the engine cover if equipped.
• Disconnect the negative battery cable using a 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake ducting

• Use a flat-blade trim tool to lift off the engine cover if it is clipped on.
• If the intake duct blocks access, loosen the clamps with a 10mm socket and remove the duct.
• Keep hardware grouped together.

Step 2: Disconnect the battery

• Use a 10mm socket to remove the negative battery cable.
• Move the cable aside so it cannot spring back onto the terminal.

Step 3: Unplug the ignition coil electrical connectors

• Work one coil at a time so you do not mix up connectors.
• Press the connector lock tab, then pull the connector straight off by hand.
• If a connector is tight, use needle-nose pliers gently on the connector body, not the wire.

Step 4: Remove the ignition coil hold-down bolts

• Use a 10mm socket and ratchet to remove each coil bolt.
• Lift each coil straight up and out of the spark plug tube.
• Torque to 8 N·m (71 in-lbs) on installation.

Step 5: Install the new ignition coils

• Compare the new coil to the old one before installing.
• Apply a small amount of dielectric grease inside each coil boot. This is a silicone grease that helps the boot seal and makes future removal easier.
• Push each coil straight down until it seats fully on the spark plug.
• Install the hold-down bolt by hand first, then tighten with a torque wrench to 8 N·m (71 in-lbs).

Step 6: Reconnect the coil connectors

• Push each connector on until it clicks.
• Give each one a light tug to confirm it is locked.

Step 7: Reinstall intake parts and engine cover

• Reinstall the intake duct and tighten the clamps with a 10mm socket.
• Reinstall the engine cover by pressing it down into place.
• Reconnect the negative battery cable with a 10mm socket.

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✅ After Repair

• Start the engine and let it idle.
• Listen for a smooth idle and check for the check engine light.
• If the light was on before, clear codes with a scan tool and confirm the misfire is gone.
• Test drive gently and verify normal power delivery.
• If a misfire remains, inspect the spark plugs and wiring next.

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💰 DIY vs Shop Cost

Shop Cost: $520-$1,050 (parts + labor)

DIY Cost: $240-$560 (parts only)

You Save: $280-$490 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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