ignition

Coil Pack

for 2012 Ford F-150 3.5L V6 EcoBoost · 4WD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Mechanic · 20+ years

Difficulty

Easy

Time

1.0 h

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

This procedure covers the removal and replacement of ignition coil packs on the 3.5L EcoBoost V6 engine, including accessing coils under the engine cover and replacing spark plugs if needed.

Warnings

⚠Allow engine to cool completely before starting work to prevent burns from hot components

⚠EcoBoost engines have aluminum heads - over-torquing spark plugs can cause thread damage requiring expensive repairs

ℹ️The 3.5L EcoBoost has six cylinders in a V configuration with three coils per bank

Tools required

Socket set with extensionsEssential

7mm socket or nut driverEssential

10mm socketEssential

Torque wrenchEssential

Spark plug socket (5/8 inch or 16mm)

Dielectric greaseEssential

Anti-seize compound

Compressed air

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Ignition coil pack(s) × 1 — Motorcraft DG-511 or equivalent
Spark plug(s) × 1 — Motorcraft SP-546 (iridium)

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Preparation

Ensure engine is cool to the touch
Disconnect negative battery cable to prevent accidental ignition system activation
Identify which coil pack(s) need replacement - cylinders 1-2-3 are passenger side (right bank), 4-5-6 are driver side (left bank)
Remove engine cover by lifting upward - it is retained by grommets on ball studs

Procedure

1
Remove engine cover
Grasp the engine cover firmly and pull straight upward to disengage the rubber grommets from the ball studs. The cover may require moderate force to release. Set cover aside in a clean area.
2
Disconnect electrical connector
Locate the ignition coil for the cylinder being serviced. Press the locking tab on the electrical connector and pull straight up to disconnect from the coil pack. Do not pull on the wires themselves.
3
Remove coil pack mounting bolt
Using a 7mm socket, remove the single bolt securing the ignition coil to the valve cover. Keep the bolt in a safe location for reinstallation.
4
Extract ignition coil
Grasp the coil pack firmly and pull straight upward with a twisting motion to break the seal. The coil may be tight in the spark plug tube. Avoid excessive side-to-side movement that could damage the boot.
5
Clean spark plug area
Use compressed air to blow out any debris from around the spark plug well before proceeding. Debris falling into the cylinder can cause engine damage. Inspect the coil boot for oil contamination which may indicate valve cover gasket leakage.
⚠Do not allow dirt or debris to fall into the spark plug well or cylinder
6
Remove spark plug (if replacing)
If replacing spark plugs, use a 5/8 inch spark plug socket with extension to remove the spark plug. Turn counterclockwise until the plug is free. Inspect the old plug condition for signs of misfiring, oil fouling, or incorrect heat range.
7
Install new spark plug (if replacing)
Apply a small amount of anti-seize compound to the spark plug threads (avoid getting any on the electrode). Thread the new spark plug by hand to prevent cross-threading, then tighten to specification using a torque wrench. The aluminum cylinder heads require precise torque to avoid damage.
⚠️CRITICAL: Do not exceed 20 Nm (15 lb-ft) torque specification - aluminum threads strip easily
8
Prepare new coil pack
Apply a thin coat of dielectric grease to the inside of the new coil boot. This prevents moisture intrusion and makes future removal easier. Do not use excessive grease.
9
Install new coil pack
Align the coil pack with the spark plug well and push down firmly until it is fully seated on the spark plug. The coil should sit flush with the valve cover mounting surface. Ensure the mounting bolt hole is properly aligned.
10
Install coil mounting bolt
Install the 7mm mounting bolt and tighten to specification using a torque wrench. Do not over-tighten as this can crack the coil housing or damage valve cover threads.
11
Reconnect electrical connector
Press the electrical connector onto the coil pack until you hear and feel a positive click. Gently tug on the connector to verify it is locked in place.
12
Reinstall engine cover
Align the engine cover grommets with the ball studs on the engine and press down firmly until all grommets are fully seated. The cover should sit evenly without gaps.
13
Reconnect battery
Reconnect the negative battery cable. The PCM may need to relearn idle characteristics after coil replacement.

Reassembly

Ensure all electrical connectors are fully locked in place with audible clicks
Verify engine cover is properly seated on all mounting grommets
Double-check that all tools have been removed from engine compartment

Verification

Start the engine and verify it runs smoothly without misfires or rough idle
Check for diagnostic trouble codes using an OBD-II scanner - clear any codes that were present before the repair
Listen for any unusual sounds or detect any vibrations that would indicate improper installation
Verify no check engine light after several minutes of operation
Test drive the vehicle under light and moderate acceleration to confirm proper operation under load

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