🔧 Equinox - Spark Plug Replacement

You’ll be replacing the four spark plugs on your Equinox and removing the ignition coils that sit on top of them. This helps restore smooth running, better fuel economy, and easier starts.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; hot parts can cause burns.
• ⚠️ Disconnect the negative battery cable before unplugging ignition parts to avoid short circuits.
• ⚠️ Keep metal tools away from the battery positive terminal to prevent sparks.
• ⚠️ Do not pull on ignition coil wires; always use the plastic connector body.
• ⚠️ Use the correct spark plugs for your engine; wrong type can cause misfires or damage.

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🔧 Required Tools

You'll need the following tools for this repair:

• 🧰 3/8" drive ratchet
• 🧰 3/8" drive torque wrench (5–50 ft-lbs range)
• 🧰 5/8" spark plug socket (with rubber insert)
• 🧰 3/8" drive extension (6")
• 🧰 10mm socket
• 🧰 Flathead screwdriver (medium)
• 🧰 Needle-nose pliers
• 🧰 Feeler gauge set
• 🧰 Small wire brush
• 🧰 Shop rags
• 🧰 Compressed air can or small air pump
• 🧰 Battery terminal wrench (10mm)
• 🧰 Mechanic’s gloves
• 🧰 Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 🧱 Iridium spark plugs (GM-spec for 2.4L) - Qty: 4
• 🧱 Dielectric grease (for ignition coil boots) - Qty: 1 small tube
• 🧱 Throttle body/intake cleaner spray - Qty: 1 (optional for light cleaning in area)
• 🧱 Shop towels - Qty: 1 pack

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📋 Before You Begin

• Park the Equinox on level ground, shift to Park, and set the parking brake.
• Turn ignition OFF and remove the key; wait a few minutes for everything to power down.
• Open the hood and support it with the prop rod.
• Disconnect the negative battery terminal using a 10mm socket or battery terminal wrench, and tuck the cable away so it cannot spring back.
• Make sure you have the correct spark plugs pre-gapped to GM spec (about 0.040" / 1.0 mm). You will confirm with a feeler gauge set before installing.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Put on your mechanic’s gloves and safety glasses.
• Grab the plastic engine cover at the front and rear edges.
• Pull straight up firmly; it is held by rubber grommets, not bolts.
• Lift the cover out and set it aside.
• Pull evenly so it pops off smoothly.

Step 2: Locate the ignition coils

• On top of the engine, you’ll see a row of four black ignition coils, each with an electrical connector.
• These coils sit directly over the spark plugs on your 2.4L engine.
• Blow away any loose dust around the coil area using compressed air or a hand pump.
• Keeping dirt out of plug holes is very important.

Step 3: Disconnect the ignition coil connectors

• Pick one coil to start with; you’ll go one at a time to avoid mixing parts.
• On the coil’s electrical connector, gently lift the locking tab using a flathead screwdriver if needed.
• Pull the connector straight off by the plastic body, not the wires.
• Repeat for all four coils so all connectors are unplugged.

Step 4: Remove the ignition coils

• Use a 10mm socket and ratchet to remove the single bolt holding each ignition coil.
• Set the bolts somewhere safe; you will reuse them.
• Twist each coil gently by hand to break it loose, then pull straight up to remove.
• If a coil is stuck, twist a bit more, but don’t pry hard with tools.
• Lay the coils in order so you know which came from which cylinder, just in case.

Step 5: Clean around the spark plug wells

• Look down into the spark plug wells (the holes where the coils were).
• If you see sand, dust, or debris around the top of the old plugs, blow it out carefully with compressed air.
• Do not let debris fall into the engine.
• Take your time here; cleanliness saves headaches.

Step 6: Remove the old spark plugs

• Attach the 5/8" spark plug socket to the 6" extension, then to your ratchet.
• Lower the socket straight down onto the first spark plug until it seats fully.
• Turn the ratchet counterclockwise to loosen the plug; once loose, spin it out by hand using the extension.
• Lift the plug out; the rubber insert in the spark plug socket should hold it.
• Repeat for all four spark plugs.

Step 7: Check and adjust the spark plug gaps (if needed)

• Take a new spark plug and slide the correct blade on your feeler gauge set (0.040" / 1.0 mm) between the center electrode and ground strap.
• You should feel a slight drag. If it’s very loose or won’t fit, the gap is off.
• If needed, gently tap the ground strap on a hard surface or use the tool’s built-in adjuster to open or close the gap slightly.
• Do not bend the center electrode.
• Many iridium plugs come pre-gapped; just confirm.

Step 8: Install the new spark plugs

• Do not apply anti-seize to the threads; GM plugs usually have a special coating.
• Thread each new spark plug into its hole by hand using just the 5/8" spark plug socket and extension (no ratchet yet).
• Turn clockwise by hand at least 5–6 full turns; this prevents cross-threading.
• Once seated by hand, attach your torque wrench to the extension.
• Tighten each plug to 25 Nm (18 ft-lbs).
• If you lack a torque wrench, don’t overtighten.

Step 9: Prep the ignition coils

• Inspect each ignition coil boot (the rubber tube that goes over the plug) for cracks or heavy oil. Replace any damaged coils if needed.
• Certain light dust can be wiped away with shop rags.
• Put a tiny amount of dielectric grease inside the tip of each boot. This helps seal out moisture and makes removal easier later.

Step 10: Reinstall the ignition coils

• Push each coil straight down onto its spark plug until you feel it seat.
• Install the 10mm bolt for each coil using the 10mm socket and start it by hand.
• Once all bolts are started, snug them with the ratchet, then tighten to 10 Nm (89 in-lbs) using the torque wrench.
• Do not overtighten; they are small bolts.

Step 11: Reconnect ignition coil connectors

• Push each electrical connector onto its coil until it clicks.
• Gently tug to confirm it is locked in place.
• Make sure no wires are kinked or pinched.

Step 12: Reinstall the engine cover and reconnect battery

• Line up the engine cover over the mounting points.
• Press down firmly at each corner until it snaps back into its rubber grommets.
• Reconnect the negative battery terminal using the 10mm socket, and tighten the nut snugly.

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✅ After Repair

• Start the engine and let it idle. It should run smoothly without shaking or misfire sounds.
• Check that the Check Engine Light is off. If it was on before, it may clear after a few drive cycles; if not, a scan tool can erase stored codes.
• Take a short test drive around the block. Pay attention to acceleration, idle at stops, and any unusual noises.
• After the drive, shut off the engine and recheck under the hood for any loose connectors or parts.

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💰 DIY vs Shop Cost

Shop Cost: $180–$280 (parts + labor)

DIY Cost: $40–$90 (parts only)

You Save: $90–$240 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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