🔧 Ignition Coil Replacement

Your Silverado uses one ignition coil per cylinder, mounted on top of each spark plug. Replacing a weak or failed coil can fix misfires, rough idle, flashing check engine lights, and poor fuel economy.

Difficulty Level: Beginner | Estimated Time: 1.5-3 hours

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⚠️ Safety & Precautions

• Work with the engine completely cool before touching coils or plugs.
• Disconnect the negative battery cable before unplugging ignition coils.
• Do not pull on the coil wire harness; use the connector lock tab first.
• Keep dirt out of the spark plug wells while the coils are removed.
• One coil per cylinder.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• Ratchet
• 6-inch extension
• Trim panel tool
• Needle-nose pliers
• Torque wrench
• Dielectric grease
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 8

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Turn the ignition off and remove the key or fob from the vehicle.
• Let the engine cool fully.
• Disconnect the negative battery cable using a 10mm socket.
• Label the coils if you plan to inspect them later.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the hood and access the coil covers

• Open the hood and locate the ignition coil covers on top of each valve cover.
• Use a 10mm socket and ratchet to remove any engine cover fasteners if equipped.
• Lift the cover straight up and set it aside.

Step 2: Disconnect the coil electrical connector

• Find the connector on the coil you are replacing.
• Use your fingers or needle-nose pliers to release the connector lock tab if needed.
• Pull the connector straight off the coil.

Step 3: Remove the ignition coil

• Use a 10mm socket, ratchet, and 6-inch extension to remove the coil retaining bolt.
• Twist the coil gently left and right, then pull it straight up out of the spark plug well.
• If it sticks, keep twisting lightly. Do not pry hard.

Step 4: Inspect the spark plug well

• Look for oil, water, or dirt in the plug tube.
• Wipe out light dirt with a clean rag.
• Oil in the well usually means another repair is needed.

Step 5: Install the new ignition coil

• Apply a small amount of dielectric grease inside the coil boot.
• Align the new coil over the spark plug and push it straight down until fully seated.
• Install the retaining bolt with a 10mm socket and tighten it to 10 Nm (89 in-lbs).

Step 6: Reconnect the electrical connector

• Push the connector onto the coil until it clicks.
• Make sure the lock tab is fully engaged.

Step 7: Repeat for the remaining coils

• Repeat the same process for each coil that needs replacement.
• If replacing all coils, work one cylinder at a time to avoid mix-ups.

Step 8: Reinstall covers and reconnect battery

• Reinstall any engine covers using a 10mm socket.
• Reconnect the negative battery cable and tighten it with a 10mm socket.

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✅ After Repair

• Start the engine and listen for smooth idle.
• Check that the check engine light is off.
• If you had a misfire code, clear it with a scan tool if needed.
• Test drive the truck and make sure it accelerates smoothly.
• If a misfire stays on one cylinder after replacement, inspect the spark plug and wiring next.

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💰 DIY vs Shop Cost

Shop Cost: $400-$900 (parts + labor)

DIY Cost: $160-$400 (parts only)

You Save: $240-$500 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3 hours.

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🎯 Ready to get started?

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