🔧 Ranger - Ignition Coil Replacement

Your Ranger’s ignition coils sit on top of the spark plugs and create the high voltage needed to fire the plugs. Replacing a bad coil can fix misfires, rough idle, and a flashing check engine light (misfire can damage the catalytic converter).

Difficulty Level: Beginner | Estimated Time: 0.5-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool before working near the turbo/engine.
• ⚠️ Keep the key away from the truck so it can’t auto-start.
• ⚠️ If you disconnect the battery: use your radio presets/clock may reset.
• ⚠️ Do not pull on wiring; pull on connectors and coil bodies only.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4" drive ratchet
• 6" 1/4" drive extension
• Torque wrench (inch-pound)
• Flat trim tool
• Pick tool
• Needle-nose pliers
• Dielectric grease applicator
• Shop towels
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Replace as needed or replace all four - Qty: 1-4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool to the touch.
• If you want maximum safety: disconnect the negative battery cable (10mm) and isolate it so it can’t spring back. (If you do this, add a 10mm socket to your tools.)

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Lift the cover straight up by hand; if it’s tight, gently pry at the corners using a flat trim tool.
• Set it aside where it won’t get stepped on.

Step 2: Choose which coil(s) you’re replacing

• If you’re replacing one failed coil, do one at a time so connectors don’t get mixed up.
• Tip: Take a quick photo before unplugging.

Step 3: Unplug the ignition coil electrical connector

• Press the locking tab and pull the connector straight off.
• If the tab is stubborn, use a pick tool to gently lift the lock while pulling.
• Do not pull on the wires.

Step 4: Remove the coil hold-down bolt

• Remove the bolt using an 8mm socket, 6" 1/4" drive extension, and 1/4" drive ratchet.
• Keep the bolt with that coil so nothing gets lost.

Step 5: Remove the ignition coil

• Grip the coil body, twist it gently left-right, then pull straight up.
• If it’s stuck, keep twisting—don’t pry on the valve cover.

Step 6: Prep and install the new coil

• Apply a small smear of dielectric grease inside the rubber boot (this helps prevent moisture and makes future removal easier).
• Push the coil straight down onto the spark plug until it fully seats (you’ll feel it “bottom out”).

Step 7: Reinstall and torque the coil bolt

• Install the bolt by hand first to avoid cross-threading.
• Tighten using an 8mm socket and finish with a torque wrench (inch-pound).
• Torque to 62 in-lb (7 Nm).

Step 8: Reconnect the electrical connector

• Push the connector on until you feel/hear it click.
• Gently tug it to confirm it’s locked.

Step 9: Reinstall the engine cover

• Line it up with the mounting points and press down firmly by hand.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds. It should run smooth.
• If you had a check engine light, clear codes with a scan tool and verify no misfire codes return (P0300-P0304).
• Test drive 5-10 minutes with light acceleration, then recheck for warning lights.
• If the engine still misfires, the spark plug (or injector/wiring) may be the cause.

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💰 DIY vs Shop Cost

Shop Cost: $180-$450 (parts + labor, depending on how many coils)

DIY Cost: $45-$320 (parts only)

You Save: $135-$130 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 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.