🔧 Equinox - Spark Plug Replacement

You’ll be removing the ignition coils, taking out the old spark plugs, installing new ones, and putting everything back carefully. This will restore proper combustion, improve fuel economy, and prevent misfires in your Equinox.

Difficulty Level: Beginner | Estimated Time: 1-1.5 hours

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⚠️ Safety & Precautions

• 🛑 Let the engine cool completely; hot engine parts can burn you.
• 🛑 Work in a well-ventilated area with the engine off and key removed.
• 🛑 Disconnect the negative battery cable if you are nervous around electrical connectors.
• 🛑 Do not pull on ignition coil wires; only pull on the plastic connectors.
• 🛑 Keep dirt out of the spark plug holes; debris inside cylinders can cause engine damage.

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🔧 Required Tools

You'll need the following tools for this repair:

• 🧰 3/8" drive ratchet
• 🧰 6" 3/8" drive extension
• 🧰 5/8" spark plug socket (magnetic or rubber insert)
• 🧰 10mm socket
• 🧰 Torx T30 bit socket
• 🧰 Inch-pound torque wrench (30–250 in-lbs range)
• 🧰 Foot-pound torque wrench (5–75 ft-lbs range)
• 🧰 Flat trim tool or small flathead screwdriver
• 🧰 Spark plug gap gauge (coin or wire style)
• 🧰 Compressed air can or small hand air pump
• 🧰 Clean shop rags
• 🧰 Mechanic gloves
• 🧰 Safety glasses
• 🧰 Battery terminal wrench 10mm

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 🧱 Spark plugs (iridium, correct for 1.5L turbo) - Qty: 4
• 🧱 Dielectric grease (for ignition coil boots) - Qty: 1 small tube
• 🧱 Anti-seize compound (nickel-based, optional if plugs not pre-coated) - Qty: 1 small tube
• 🧱 Throttle body/intake cleaner spray - Qty: 1 (for light cleaning around area if needed)
• 🧱 Shop towels - Qty: 1 pack

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📋 Before You Begin

• 🧭 Park your Equinox on a level surface, shift to Park, and set the parking brake.
• 🧭 Turn the engine off and let it cool for at least 30–45 minutes.
• 🧭 Open the hood and secure it with the hood prop rod.
• 🧭 If you prefer extra safety, use the 10mm socket to disconnect the negative battery terminal and move the cable aside.
• 🧭 Keep new spark plugs in their boxes until you are ready to install them to avoid dropping or dirtying them.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove engine cover

• Use your hands to pull up on the plastic engine cover; it is held by rubber grommets.
• Lift straight up from the corners until it pops free, then remove it and set it aside.
• Pull firmly but gently; it will pop off.

Step 2: Identify ignition coils and clean area

• You will see four ignition coils on top of the engine; each coil sits over one spark plug.
• Use the compressed air can to blow away dust and debris around the coils and bolt areas.
• Wipe around the area with clean shop rags if needed.
• Cleaning now keeps dirt out of cylinders.

Step 3: Disconnect ignition coil electrical connectors

• On each coil, press the small plastic tab on the connector using your thumb or a flat trim tool if needed.
• Gently pull the connector straight back off the coil; do not yank on the wires.
• Repeat for all four coils so they are all unplugged.

Step 4: Remove ignition coils

• Use a 10mm socket and 3/8" ratchet to remove the bolt holding each coil to the valve cover.
• Set the 10mm bolts aside in a safe place where they won’t be lost.
• Grab each coil by the body and twist it gently while pulling upward to remove it from the spark plug well.
• Place the coils in order so you know which one came from which cylinder, in case you need to trace a later issue.
• Torque on install later: 8 Nm (71 in-lbs)

Step 5: Remove old spark plugs

• Attach the 5/8" spark plug socket to the 6" extension and 3/8" ratchet.
• Carefully lower the socket down into the first spark plug hole until you feel it seat on the plug.
• Turn the ratchet counterclockwise to loosen the plug and remove it completely.
• Slowly pull the socket and extension straight up; the old plug should come out with the socket.
• Repeat for all four spark plugs.
• If a plug feels stuck, go slow and steady.

Step 6: Check and adjust new spark plug gaps

• A spark plug gap is the small distance between the center electrode and the ground strap at the tip of the plug.
• Use the spark plug gap gauge to measure the gap on each new plug.
• For the 1.5L turbo in your Equinox, the correct gap is typically around 0.028"-0.032" (0.7-0.8 mm); verify with the plug box or data sheet.
• If the gap is off slightly, gently bend the ground strap using the gauge tool until it measures correctly.
• Do not touch or hit the center electrode; it is fragile.

Step 7: Prepare new spark plugs for installation

• If the manufacturer recommends it and the threads are not already coated, apply a very thin film of anti-seize compound to the plug threads only, avoiding the tip.
• Use a clean rag to wipe off any extra anti-seize; too much can affect torque.
• Apply a tiny amount of dielectric grease inside each ignition coil boot (the rubber end that goes over the plug). Dielectric grease is a non-conductive lubricant that helps keep moisture out and makes removal easier later.

Step 8: Install new spark plugs

• Place one new spark plug into the 5/8" spark plug socket with the rubber or magnetic insert holding it securely.
• Lower the plug carefully into the spark plug hole using the extension, keeping it straight.
• Turn the extension by hand (without the ratchet) clockwise several turns to start the threads. It should turn easily; if it binds, back it out and start again.
• Once hand-tight, attach the 3/8" ratchet and gently snug the plug.
• Use the inch-pound torque wrench with the same socket and extension to torque each plug to 25 Nm (18 ft-lbs).
• Repeat for all four spark plugs.
• Always start spark plugs by hand to avoid cross-threading.

Step 9: Reinstall ignition coils

• Take the first ignition coil and align the boot with the spark plug hole.
• Push the coil straight down until you feel it seat over the plug.
• Install the 10mm coil bolt by hand to avoid cross-threading.
• Use the 10mm socket and 3/8" ratchet to snug the bolt.
• Use the inch-pound torque wrench with the 10mm socket to torque each coil bolt to 8 Nm (71 in-lbs).
• Repeat for all four ignition coils.

Step 10: Reconnect ignition coil connectors

• Push each electrical connector straight onto its coil until you hear or feel a click.
• Gently tug each connector to confirm it is locked in place.

Step 11: Reinstall engine cover

• Align the engine cover over the mounting posts on the top of the engine.
• Press down firmly at each corner until it snaps into the rubber grommets.

Step 12: Reconnect battery (if disconnected)

• Place the negative cable back on the battery negative terminal.
• Use the 10mm socket to tighten the clamp until snug; do not overtighten.

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✅ After Repair

• 🚗 Start the engine and let it idle for a minute; listen for smooth, even running with no misfires or shaking.
• 🚗 Check that the check engine light is off. If it was on before for misfires, it may clear itself after a few drive cycles; if not, a scan tool can clear it.
• 🚗 Take a short test drive, gently accelerating and checking that the engine feels smooth and responsive.
• 🚗 After the drive, shut the engine off and recheck around the coils for anything loose or out of place.

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💰 DIY vs Shop Cost

Shop Cost: $220-$320 (parts + labor)

DIY Cost: $50-$100 (parts only)

You Save: $120-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.0 hours.

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🎯 Ready to get started?

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