🔧 Pilot - Ignition Coil Replacement

Your Pilot uses coil-on-plug ignition coils (one per cylinder). Replacing a weak coil fixes common issues like a rough idle, hesitation, and misfire codes.

Difficulty Level: Intermediate | Estimated Time: 1.0-3.0 hours

---

⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; the rear bank sits near hot components.
• ⚠️ If the check engine light is flashing, avoid driving until repaired (can damage catalytic converters).
• ⚠️ Disconnect the battery negative cable before unplugging multiple connectors.
• ⚠️ Pull electrical connectors by the plastic housing, not the wires.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 1/4" ratchet
• 3/8" ratchet
• 3" extension (1/4")
• 6" extension (3/8")
• Universal joint swivel (3/8")
• Torque wrench (5–30 Nm range)
• Torque wrench (20–80 Nm range)
• Hose clamp pliers
• Flat trim tool
• Pick tool
• Magnetic pickup tool
• Flashlight
• Shop towels
• Nitrile gloves
• Safety glasses
• OBD2 scan tool

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 (or Qty: 6 to replace all)
• Dielectric grease (silicone) - Qty: 1
• Upper intake manifold gasket set - Qty: 1 (only if upper intake is removed)
• Throttle body gasket - Qty: 1 (only if throttle body is removed)

---

📋 Before You Begin

• Park on level ground, set the parking brake, and open the hood.
• Use a 10mm socket to disconnect the battery negative cable and move it aside so it can’t spring back.
• Use an OBD2 scan tool to read codes and note which cylinder is misfiring (example: P0304 = cylinder 4).
• Do one coil at a time to avoid mix-ups.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Pull up firmly to release the cover from the rubber grommets (or remove fasteners if equipped) using a 10mm socket.

Step 2: Replace coils on the front bank (radiator side)

• Unplug the coil connector by pressing the lock tab and pulling straight back. Use a pick tool only to gently lift the tab if it’s stuck.
• Remove the coil hold-down bolt using a 10mm socket and 1/4" ratchet with a 3" extension (1/4").
• Twist the coil slightly and pull straight up to remove it.
• Apply a thin film of dielectric grease (silicone) inside the coil boot, then push the new coil straight down until fully seated.
• Reinstall the bolt with a 10mm socket and tighten with a torque wrench (5–30 Nm range): Torque to 12 Nm (9 ft-lbs).
• Reconnect the electrical connector until it clicks.

Step 3: Decide how you’ll access the rear bank (firewall side)

• If you can reach the rear coils comfortably, follow Step 2 actions on the rear bank.
• If access is too tight, use the “Upper intake removal” path below (common on your Pilot).

Step 4: Upper intake removal path (for rear bank access)

• Remove the air intake duct as needed: release clips with a flat trim tool and loosen clamps using hose clamp pliers.
• Disconnect any electrical connectors and vacuum hoses attached to the upper intake; use pick tool carefully on stubborn hose ends.
• Remove upper intake fasteners using a 12mm socket with a 3/8" ratchet and 6" extension (3/8") (use universal joint swivel (3/8") where needed).
• Lift the upper intake straight up and set it aside; place shop towels in the intake ports immediately to prevent anything from falling in.
• Magnetic pickup helps prevent dropped bolts.

Step 5: Replace the rear bank coils

• Use a flashlight to identify each rear coil.
• Repeat the same actions from Step 2: unplug connector, remove 10mm bolt, remove coil, install new coil with a small amount of dielectric grease (silicone).
• Tighten each rear coil bolt using a torque wrench (5–30 Nm range): Torque to 12 Nm (9 ft-lbs).

Step 6: Reinstall the upper intake (if removed)

• Remove the shop towels from the intake ports.
• Install the upper intake manifold gasket set if the old gaskets were disturbed/flattened.
• Set the upper intake back in place and start all fasteners by hand.
• Tighten fasteners evenly using a 12mm socket and finish with a torque wrench (20–80 Nm range): Torque to 22 Nm (16 ft-lbs).
• Reconnect vacuum hoses and electrical connectors fully.
• Reinstall the air intake duct and secure clamps using hose clamp pliers.

Step 7: Reconnect battery and reinstall engine cover

• Reconnect the battery negative cable using a 10mm socket.
• Reinstall the engine cover by pressing it onto the grommets (or tighten fasteners with a 10mm socket if equipped).

---

✅ After Repair

• Use an OBD2 scan tool to clear codes.
• Start the engine and let it idle 2–3 minutes; verify smooth idle and no flashing warning lights.
• Test drive 10–15 minutes, then re-scan for pending codes.
• If the same cylinder still misfires, the spark plug or fuel injector may be the cause (next diagnostic step).

---

💰 DIY vs Shop Cost

Shop Cost: $250-$900 (parts + labor, depending on 1 coil vs all 6 and rear-bank access)

DIY Cost: $60-$500 (parts only)

You Save: $190-$400+ by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.5 hours.

---

🎯 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.