🔧 Ignition Coils - Replacement

Your Grand Cherokee uses six coil-on-plug ignition coils, one on each spark plug. If you have a misfire, rough idle, or a check-engine light, replacing a bad coil can restore smooth running. Replace spark plugs if they are due.

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

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⚠️ Safety & Precautions

• Turn the ignition off and remove the key/fob from the vehicle.
• Let the engine cool completely before working near the cylinder heads.
• Disconnect the negative battery cable before unplugging coils. This helps prevent electrical damage.
• Do not pull on the coil wiring harness. Use the connector release tab only.
• If you get a misfire after repair, recheck that every connector is fully latched.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• 1/4-inch ratchet
• Short extension
• Torque wrench
• Flat trim tool
• Needle-nose pliers
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 6

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Make sure the engine is cool.
• Open the hood and remove any loose covers from the engine bay.
• Disconnect the negative battery cable with a 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover

• Use a flat trim tool to gently lift the plastic engine cover straight up.
• Set it aside in a safe place.

Step 2: Disconnect the battery

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

Step 3: Remove the coil electrical connectors

• At each coil, press the connector release tab and pull the plug straight off by hand.
• If a connector is tight, use needle-nose pliers carefully on the connector body, not the wires.

Step 4: Remove the ignition coil hold-down bolts

• Use an 8mm socket, 1/4-inch ratchet, and short extension to remove the coil mounting bolt.
• Keep the bolt for reuse.
• Torque to 8 Nm (71 in-lbs) on installation.

Step 5: Remove the ignition coil

• Twist the coil slightly and pull it straight up out of the spark plug well.
• If it sticks, wiggle gently. Do not pry against the valve cover.

Step 6: Install the new ignition coil

• Push the new coil straight down onto the spark plug until it seats fully.
• Reinstall the coil bolt with the 8mm socket.
• Torque to 8 Nm (71 in-lbs).

Step 7: Reconnect the electrical connector

• Push the connector onto the coil until it clicks.
• Gently tug it once to make sure it is locked.

Step 8: Repeat for any remaining coils

• Work one coil at a time so parts do not get mixed up.
• Keep parts organized by cylinder.

Step 9: Reinstall the engine cover and battery cable

• Press the engine cover back into place by hand.
• Reconnect the negative battery cable and tighten it with the 10mm socket.

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✅ After Repair

• Start the engine and let it idle.
• Listen for smooth running and check for a check-engine light.
• If the light was on before, clear codes with a scan tool and confirm the misfire is gone.
• If the engine still runs rough, the spark plug or fuel system may also need diagnosis.

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💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $180-$420 (parts only)

You Save: $270-$480 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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