🔧 Ridgeline - Ignition Coil Replacement

Your Ridgeline uses one ignition coil per cylinder (6 total). Replacing a bad coil can fix misfires, rough running, and a flashing check engine light. The front bank is straightforward; the rear bank requires removing the upper intake manifold to access the coils.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.5 hours

---

⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns.
• ⚠️ Disconnect the negative battery cable to prevent accidental shorting.
• ⚠️ Keep dirt out of the intake—cover openings with clean shop towels.
• ⚠️ Do not pull on wiring; release connector locks first.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 10mm wrench
• 3/8" ratchet
• 3/8" torque wrench (5–60 Nm range)
• 3/8" extension set (3" and 6")
• Flat-blade screwdriver
• Trim clip removal tool
• Needle-nose pliers
• Pick tool
• Flashlight
• Shop towels
• Nitrile gloves
• Safety glasses

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 6 (replace as needed)
• Upper intake manifold gasket set - Qty: 1 (required if removing manifold)
• Throttle body gasket - Qty: 1 (recommended if throttle body is removed)
• Dielectric grease - Qty: 1 (helps prevent moisture in boots)

---

📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Let the engine cool completely.
• Use a 10mm wrench to disconnect the negative battery terminal and isolate it so it can’t spring back.
• If you’re chasing a misfire, note the cylinder number from your scan tool before removing anything.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Grip the engine cover and pull upward to release the rubber grommets (it’s a press-fit cover).
• Set it aside so it won’t get stepped on.

Step 2: Remove the air intake tube (to create working space)

• Use a flat-blade screwdriver to loosen the hose clamps on the intake tube.
• Disconnect any small breather/PCV hoses using needle-nose pliers if spring clamps are used.
• Lift the intake tube out and set it aside.
• Tip: Take a quick photo for hose routing.

Step 3: Replace front bank ignition coils (easy access side)

• Locate the coils on the front bank (closest to the radiator).
• For each coil: press the connector lock and unplug it. Use a pick tool gently if the lock is stuck (don’t break it).
• Remove the coil hold-down bolt using a 10mm socket.
• Twist the coil slightly and pull straight up to remove it from the spark plug tube.
• Apply a tiny smear of dielectric grease inside the rubber boot (dielectric grease is a non-conductive grease that helps seal out moisture).
• Install the new coil fully seated, reinstall the bolt, and Torque to 12 Nm (9 ft-lbs) using a torque wrench.
• Reconnect the electrical connector until it clicks.

Step 4: Gain access to rear bank coils (upper intake manifold removal)

• Disconnect vacuum/air hoses and electrical connectors attached to the upper intake manifold. Use needle-nose pliers for spring clamps and a trim clip removal tool for any push-clips.
• Remove the upper intake manifold fasteners using a 10mm socket with a 3/8" extension.
• Lift the upper intake manifold off carefully.
• Immediately cover the lower intake ports with shop towels so nothing can fall in.

Step 5: Replace rear bank ignition coils

• With the rear bank exposed, unplug each coil connector (use a pick tool gently if needed).
• Remove each hold-down bolt using a 10mm socket.
• Remove the coil by twisting slightly and pulling straight up.
• Apply a small amount of dielectric grease inside the boot and install the new coil.
• Reinstall the bolt and Torque to 12 Nm (9 ft-lbs) using a torque wrench.
• Reconnect each electrical connector until it clicks.

Step 6: Reinstall the upper intake manifold

• Remove the shop towels covering the intake ports.
• Install new upper intake manifold gaskets (recommended once the manifold is removed).
• Set the upper intake manifold back in place, hand-start all fasteners.
• Tighten in a crisscross pattern using a 10mm socket, then Torque to 22 Nm (16 ft-lbs) using a torque wrench.
• Reconnect all hoses and connectors exactly as removed.

Step 7: Reinstall the intake tube and engine cover

• Reinstall the intake tube and tighten hose clamps using a flat-blade screwdriver.
• Reinstall any breather hoses and clamps using needle-nose pliers.
• Press the engine cover back onto its grommets.

Step 8: Reconnect the battery

• Reconnect the negative battery terminal using a 10mm wrench.

---

✅ After Repair

• Start the engine and listen for smooth idle (no shaking).
• If the check engine light was on, clear codes with your scan tool and confirm the misfire does not return.
• Test drive 10–15 minutes and re-check for warning lights.
• Recheck that every coil connector is fully clicked in.

---

💰 DIY vs Shop Cost

Shop Cost: ₹9,000–₹22,000 (parts + labor, depending on how many coils)

DIY Cost: ₹3,500–₹15,000 (parts only, depending on how many coils)

You Save: ₹5,000–₹10,000+ by doing it yourself!

Shop labor rates vary but typically run ₹800–₹1,500/hour. This repair takes a shop approximately 1.5–3.0 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.