🔧 Forte - Spark Plug Replacement

Replacing spark plugs restores smooth idle, good fuel economy, and easy starts. On your Forte, the plugs sit under the ignition coils on top of the engine, so this job is straightforward with basic hand tools.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

Assumption: 2.0L uses coil-on-plug ignition (one coil per plug).

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine to avoid burns and protect aluminum threads.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorts.
• ⚠️ Keep dirt out of the spark plug holes; debris can damage the engine.
• ⚠️ Do not over-tighten spark plugs; the cylinder head is aluminum.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 5/8" spark plug socket
• Torque wrench (3/8" drive, 10-40 ft-lb range)
• Small flathead screwdriver
• Compressed air blow gun
• Feeler gauge set
• Dielectric grease
• Magnetic pickup tool

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (OEM-spec iridium/platinum, correct heat range) - Qty: 4
• Ignition coil boot (only if torn/oil-soaked) - Qty: 0-4

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Let the engine fully cool (at least 30-60 minutes after driving).
• Use a 10mm socket to disconnect the negative battery terminal and tuck it aside.
• A spark plug socket is a deep socket with an internal rubber insert that grips the plug.
• A torque wrench clicks when the correct tightness is reached.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Lift the cover straight up to pop it off the mounting grommets.
• If your cover uses fasteners, remove them with a 10mm socket and 3/8" drive ratchet.

Step 2: Unplug and remove ignition coils

• At each coil, press the electrical connector lock tab; use a small flathead screwdriver gently if needed.
• Remove the coil hold-down bolt with a 10mm socket, 3/8" drive ratchet, and 3" extension.
• Twist the coil slightly, then pull straight up to remove it.
• Set coils in order (cylinder 1-4) so they go back to the same spots.

Step 3: Clean around the spark plug wells

• Blow out each plug well using a compressed air blow gun to remove sand/dirt.
• Clean first so debris can’t fall in.

Step 4: Remove the old spark plugs

• Install the 5/8" spark plug socket on a 6" extension and 3/8" drive ratchet.
• Turn counterclockwise to loosen and remove the plug.
• If a plug feels stuck, stop and work it back-and-forth gently with the 3/8" drive ratchet.
• Use a magnetic pickup tool if a plug is hard to lift out once loose.

Step 5: Check the new plug gap (only if the box instructs you to)

• Use a feeler gauge set to verify the gap matches the plug manufacturer spec on the box.
• Do not force-bend fine-wire iridium tips; if the gap is off, exchange the plug.

Step 6: Install new spark plugs by hand first

• Place a new plug into the 5/8" spark plug socket (the rubber insert will hold it).
• Thread the plug into the engine by hand using the extension only (no ratchet at first).
• If you feel resistance early, back it out and try again to avoid cross-threading.

Step 7: Torque the spark plugs

• Use a torque wrench (3/8" drive, 10-40 ft-lb range) with the 5/8" spark plug socket and extension.
• Torque to 18-22 Nm (13-16 ft-lbs).
• No anti-seize on plated plugs.

Step 8: Reinstall ignition coils

• Apply a tiny smear of dielectric grease inside each coil boot; this helps prevent moisture and makes future removal easier.
• Push the coil straight down until fully seated on the plug.
• Install the coil hold-down bolt using a 10mm socket and 3/8" drive ratchet, then tighten with the torque wrench.
• Torque coil bolts to 9-10 Nm (80-89 in-lbs).
• Reconnect each coil electrical connector until it clicks.

Step 9: Reconnect battery and reinstall engine cover

• Reconnect the negative battery terminal using a 10mm socket and 3/8" drive ratchet.
• Reinstall the engine cover by pressing it back onto the grommets (or tighten fasteners with the 10mm socket if equipped).

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds; it should run smooth with no shaking.
• If the engine runs rough or the check engine light flashes, shut it off and re-check each coil connector is fully clicked in.
• Take a short test drive and verify normal power and no warning lights.

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💰 DIY vs Shop Cost

Shop Cost: $200-$450 (parts + labor)

DIY Cost: $40-$120 (parts only)

You Save: $160-$330 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.7-1.0 hours.

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🎯 Ready to get started?

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