🔧 TITAN - Spark Plug Replacement

On your TITAN’s 5.6L V8, the spark plugs sit under individual ignition coils (coil-on-plug). You’ll remove the coils, swap the plugs, and reinstall everything with correct torque so the threads in the aluminum cylinder heads aren’t damaged.

Difficulty Level: Intermediate | Estimated Time: 2.0-4.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns and thread damage.
• ⚠️ Disconnect the negative battery cable to prevent coil/ECM damage.
• ⚠️ Keep dirt out of the plug wells—blow them out before removing plugs.
• ⚠️ Do not over-tighten spark plugs; the cylinder heads are aluminum.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 1/4" drive ratchet
• 3/8" drive ratchet
• 3/8" drive torque wrench (10–40 ft-lbs range)
• 1/4" drive torque wrench (in-lbs range)
• 3/8" drive extension set (3", 6", 12")
• 5/8" spark plug socket
• Flat-blade screwdriver
• Needle-nose pliers
• Trim clip remover
• Compressed air blow gun
• Feeler gauge set
• Shop vacuum
• Clean shop rags
• Nitrile gloves
• Safety glasses
• Telescoping inspection mirror
• Magnetic pickup tool

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (OEM-spec iridium) - Qty: 8
• Upper intake manifold gasket set - Qty: 1
• Throttle body gasket - Qty: 1
• 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 completely.
• Use a 10mm socket to disconnect the negative battery cable and isolate it so it can’t spring back. Dielectric grease reduces moisture and arcing.
• If you end up removing the upper intake, take a few clear photos of hose routing and connector locations for reassembly.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and open up access

• Remove the engine cover by releasing the retainers (use a trim clip remover if needed) and lifting it off.
• Loosen the intake tube clamps using a flat-blade screwdriver and move the intake ducting as needed for working room.

Step 2: Decide access method for the rear cylinders

• If you can clearly reach all coils and spark plugs with a 5/8" spark plug socket and extensions, proceed to Step 3.
• If the rear plugs are blocked by the upper intake, jump to Step 6 (upper intake removal path), then return to Step 3.

Step 3: Remove ignition coils (one cylinder at a time)

• Unplug the coil electrical connector by releasing the lock tab (use needle-nose pliers gently only if needed).
• Remove the coil retaining bolt using a 10mm socket.
• Twist the coil boot slightly and pull straight up to remove the coil.
• Do one cylinder at a time to avoid mix-ups.

Step 4: Clean the spark plug well

• Blow out the spark plug tube/well using a compressed air blow gun so dirt can’t fall into the cylinder.
• If you see sand/debris pooling, vacuum it out with a shop vacuum first, then blow it clean.

Step 5: Remove and install the spark plug

• Remove the spark plug using a 5/8" spark plug socket, 3/8" drive ratchet, and the best-length 3/8" drive extension for access.
• Check the new plug gap using a feeler gauge set (only adjust if the plug manufacturer allows it for that plug type).
• Thread the new plug in by hand using the spark plug socket and an extension only (no ratchet at first). If it doesn’t thread smoothly, stop and realign.
• Tighten with a 3/8" drive torque wrench: Torque to 25 Nm (18 ft-lbs).
• Do not use anti-seize unless plug maker requires it.

Step 6: Reinstall the ignition coil

• Apply a very small amount of dielectric grease inside the coil boot (a thin smear). This helps prevent moisture and makes future removal easier.
• Push the coil straight down until fully seated on the plug.
• Install the coil bolt using a 10mm socket, then tighten with a 1/4" drive torque wrench: Torque to 7 Nm (62 in-lbs).
• Reconnect the electrical connector and confirm it clicks/locks in place.

Step 7: Repeat for all remaining cylinders

• Repeat Steps 3–6 for the remaining 7 spark plugs.
• Use a telescoping inspection mirror to confirm coil connectors are fully seated, especially on the rear cylinders.

Step 8 (If needed): Upper intake removal path for rear plug access

• Disconnect intake ducting and any attached breather hoses using a flat-blade screwdriver and needle-nose pliers (as applicable).
• Unplug required connectors around the throttle body/upper intake (release tabs carefully; use a trim clip remover to avoid breaking clips).
• Remove upper intake fasteners using a 12mm socket and 3/8" drive ratchet.
• Lift the upper intake off carefully and cover the intake ports immediately with clean shop rags.
• Replace the gaskets before reassembly: install the upper intake manifold gasket set and throttle body gasket.
• Reinstall the upper intake and tighten fasteners evenly using a 3/8" drive torque wrench: Torque to 25 Nm (18 ft-lbs).
• Remove rags from ports before final assembly, then continue with Steps 3–7.

Step 9: Reassemble intake ducting and engine cover

• Reinstall any intake tubes/hoses and tighten clamps using a flat-blade screwdriver.
• Reinstall the engine cover.
• Reconnect the negative battery terminal using a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should run smooth with no misfire.
• Check for intake air leaks: listen for hissing and confirm all clamps/hoses are tight.
• If you get a check engine light or rough running, re-check coil connectors and that each coil is fully seated.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $90-$220 (parts only)

You Save: $360-$630 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 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.