🔧 GX460 - Ignition Coil Replacement

Your GX460 uses one ignition coil per cylinder (8 total). Replacing a weak or failed coil can fix misfires, rough idle, flashing check-engine light, and loss of power.

Difficulty Level: Beginner | Estimated Time: 1.0-2.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; coils sit near hot metal.
• ⚠️ Keep the ignition OFF and key away from the vehicle while unplugging coils.
• ⚠️ Disconnect the negative battery cable if you’ll be moving wiring a lot (recommended for beginners).
• ⚠️ Do not pull on wires—only on connector bodies.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3" extension
• Torque wrench (in-lb or low-range Nm)
• Trim clip tool
• Small flathead screwdriver
• Needle-nose pliers
• Shop flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

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

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📋 Before You Begin

• 🧰 Park on level ground, shift to Park, and set the parking brake.
• 🧰 Let the engine cool fully so you don’t burn yourself.
• 🧰 If disconnecting the battery: use a 10mm socket to remove the negative terminal and isolate it so it can’t spring back.
• 🧰 Tip: Label coils by cylinder if diagnosing.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Grab the plastic engine cover and pull straight up to release it from the rubber grommets.
• If any clips or ducts block access, use a trim clip tool to pop clips out without breaking them.

Step 2: Locate the ignition coils

• Each coil sits on top of a spark plug on the valve covers (4 per side).
• A coil looks like a small “stick” with an electrical connector and a single hold-down bolt.

Step 3: Unplug the coil electrical connector

• Press the connector lock tab and pull the connector straight back.
• If it’s stubborn, gently help the tab with a small flathead screwdriver (don’t pry hard—plastic breaks easily).

Step 4: Remove the coil hold-down bolt

• Use a 10mm socket, 3" extension, and 1/4" drive ratchet to remove the bolt.
• Set the bolt aside where it won’t fall into the engine bay.

Step 5: Remove the ignition coil

• Twist the coil gently left-right to break the seal, then pull straight up.
• If it’s tight, use steady force—don’t lever against the valve cover.

Step 6: Prep and install the new coil

• Put a small dab of dielectric grease inside the new coil boot (this helps sealing and future removal).
• Push the coil straight down onto the spark plug until it seats fully.

Step 7: Reinstall the coil bolt and torque it

• Start the bolt by hand first to avoid cross-threading.
• Tighten with a torque wrench (in-lb or low-range Nm): Torque to 9 Nm (80 in-lb).

Step 8: Reconnect the electrical connector

• Push the connector on until it clicks.
• Gently tug-test it by hand to confirm it’s locked.

Step 9: Repeat for remaining coils

• Repeat Steps 3–8 for any other coils you’re replacing.
• Tip: Replace coils one at a time to avoid mix-ups.

Step 10: Reinstall the engine cover and reconnect battery

• Press the engine cover back down into its grommets.
• If disconnected, reconnect the negative battery cable using a 10mm socket (snug, not over-tight).

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✅ After Repair

• ✅ Start the engine and let it idle for 1–2 minutes; it should run smooth.
• ✅ If the check-engine light was on for misfire, use a scan tool to clear codes and confirm the misfire does not return.
• ✅ Road test 10–15 minutes and re-check for warning lights.
• ✅ If it still misfires, the issue may be spark plugs, injector, wiring, or compression.

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💰 DIY vs Shop Cost

Shop Cost: $350-$950 (parts + labor, depending on how many coils)

DIY Cost: $60-$600 (parts only, depending on how many coils)

You Save: $290-$350+ by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 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.