🔧 Ignition Coils - Replacement

Your Silverado uses individual coil-on-plug ignition coils mounted on each spark plug. Replacing a bad coil is straightforward, but the intake ducting and engine cover area must be removed first for access. If one coil failed and the plugs are old, it is smart to inspect the spark plugs too.

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

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⚠️ Safety & Precautions

• Let the engine cool completely before starting.
• Disconnect the negative battery cable before touching ignition components.
• Do not pull on the ignition coil wiring harness; release the connector lock first.
• Keep dirt out of the spark plug wells.
• If the engine has been misfiring, avoid extended driving until repairs are complete.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• Ratchet
• Short extension
• Flat blade trim tool
• Dielectric grease
• Torque wrench
• Safety glasses
• Gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1 per failed coil, or 8 if replacing all
• Spark plug - Qty: 1 per cylinder if replacing plugs at the same time
• Ignition coil bolt - Qty: 1 per coil if damaged or corroded

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Disconnect the negative battery cable.
• Label each coil connector if replacing more than one.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect battery power

• Use a 10mm socket to disconnect the negative battery cable.
• Move the cable aside so it cannot touch the battery post.

Step 2: Remove intake ducting if needed

• Use an 8mm socket and flat blade trim tool to remove the air intake tube or resonator pieces blocking access to the coil cover area.
• Unclip any breather hoses carefully.

Step 3: Remove the ignition coil connector

• Press the connector lock tab and pull the electrical connector straight off the coil.
• Do not yank on the wires.

Step 4: Remove the coil hold-down bolt

• Use an 8mm socket and ratchet to remove the ignition coil bolt.
• Lift the coil straight up off the spark plug.
• Twist gently if the coil is stuck.

Step 5: Inspect the spark plug well

• Check for oil, water, or dirt in the plug tube.
• If present, clean it out before installing the new coil.
• If the spark plug boot is torn or swollen, replace the coil.

Step 6: Install the new ignition coil

• Apply a small amount of dielectric grease inside the boot.
• Set the new coil straight onto the spark plug.
• Install the coil bolt by hand first, then tighten with an 8mm socket.
• Torque to 10 Nm (89 ft-lbs) if your service data or replacement coil instructions specify coil bolt torque; do not overtighten.

Step 7: Reconnect the coil connector

• Push the connector on until it clicks firmly into place.
• Make sure the wire harness is routed away from hot or moving parts.

Step 8: Reinstall intake parts and battery cable

• Reinstall any intake ducting with the 8mm socket and trim tool.
• Reconnect the negative battery cable with the 10mm socket.

Step 9: Start and verify repair

• Start the engine and let it idle.
• Check for a smooth idle and no flashing check engine light.
• If the misfire remains, scan for codes and confirm the spark plug and fuel injector are not the issue.

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✅ After Repair

• Clear any stored misfire codes with a scan tool.
• Road test the truck and confirm normal acceleration.
• Recheck that all connectors are fully seated.
• If one coil failed from oil contamination, inspect the valve cover gasket area for leaks.

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💰 DIY vs Shop Cost

Shop Cost: $180-$500 (parts + labor)

DIY Cost: $35-$200 (parts only)

You Save: $145-$300 by doing it yourself!

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

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🎯 Ready to get started?

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