🔧 Ignition Coils - Replacement

Your Silverado uses individual coil-on-plug ignition coils, one on each spark plug. Replacing a bad coil can fix misfires, rough idle, hesitation, and check-engine lights tied to a specific cylinder.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

---

⚠️ Safety & Precautions

• Ignition coils can produce very high voltage. Do not touch the coil connector or spark plug area with the engine running.
• Let the engine cool fully before starting. Hot intake parts and cylinder heads can cause burns.
• Disconnect the negative battery cable before unplugging coils. This helps avoid setting extra fault codes.
• Keep dirt out of the spark plug wells. Debris can cause misfires after the repair.
• If you find oil in the plug wells, stop and fix the valve cover leak first.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 8mm socket
• Ratchet
• Extension set
• Small flat-blade screwdriver
• Trim removal tool
• Torque wrench capable of low inch-pound settings
• Dielectric grease
• Safety glasses
• Mechanic gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 per cylinder serviced
• Dielectric grease - Qty: 1 tube
• Engine cover retainer clips - Qty: as needed

---

📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool completely.
• Disconnect the negative battery cable with a 10mm socket.
• If you are replacing a coil after a misfire, note the cylinder number from the code first so you can match the correct coil.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use a trim removal tool or by hand, depending on the cover style, to lift the plastic engine cover off the top of the engine.
• Set it aside in a safe place.
• Pull straight up to avoid breaking tabs.

Step 2: Disconnect the battery

• Use a 10mm socket to remove the negative battery cable.
• Move the cable aside so it cannot spring back and touch the post.

Step 3: Access the ignition coil

• Locate the coil for the cylinder you are servicing.
• If any intake ducting blocks access, remove it using an 8mm socket and a ratchet.
• Place all hardware in order so it goes back in the same place.

Step 4: Unplug the coil connector

• Press the connector lock tab and unplug the electrical connector from the coil.
• If the tab is stubborn, use a small flat-blade screwdriver very gently to help release it.
• Do not force the connector.

Step 5: Remove the ignition coil

• Use a 10mm socket, ratchet, and extension to remove the coil hold-down bolt.
• Lift the coil straight up and out of the spark plug well.
• If it sticks, twist it slightly by hand and try again.

Step 6: Inspect the coil boot and plug well

• Check the rubber boot for tears, swelling, or oil contamination.
• Look down into the plug well for oil, water, or debris.
• If you see contamination, clean it out before installing the new coil.

Step 7: Install the new ignition coil

• Apply a small amount of dielectric grease inside the coil boot.
• Set the new coil straight into the spark plug well.
• Install the coil bolt by hand first to avoid cross-threading.
• Use a 10mm socket to tighten the bolt.
• Torque to 8 Nm (71 in-lbs).

Step 8: Reconnect the electrical connector

• Push the connector onto the coil until it clicks.
• Give it a light tug to make sure it is locked in place.

Step 9: Reinstall removed intake parts and the engine cover

• If you removed any intake ducting, reinstall it with an 8mm socket.
• Reinstall the engine cover by pressing it down evenly.
• Make sure all clips and tabs are fully seated.

Step 10: Reconnect the battery and verify repair

• Reconnect the negative battery cable using a 10mm socket.
• Start the engine and listen for smooth idle.
• Check that the check-engine light is off.

---

✅ After Repair

• Drive the truck and confirm the misfire is gone.
• If the check-engine light stays on, clear codes with a scan tool and recheck.
• If the same cylinder misfires again, inspect the spark plug and injector next.

---

💰 DIY vs Shop Cost

Shop Cost: $250-$800 (parts + labor)

DIY Cost: $40-$320 (parts only)

You Save: $210-$480 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 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.