Complete replacement of all eight ignition coils on the 5.0L Coyote V8 engine, including removal of necessary engine covers and spark plug access.

Warnings

Tools required

Parts

• Ignition coil × 8 — Motorcraft DG508 or equivalent
• Spark plug × 8 — Motorcraft SP534 (iridium)

Preparation

1. Ensure engine is completely cool to the touch
2. Disconnect negative battery terminal and wait 2 minutes
3. Remove engine cover by pulling upward on front and rear tabs to release retaining clips
4. Clean area around valve covers to prevent debris from entering engine during service
5. Label or photograph ignition coil positions (cylinders 1-8) for correct reinstallation

Procedure

1. 1

   Remove passenger side upper engine cover bracket
   On the passenger side of the engine, locate the upper engine cover support bracket. Remove the mounting bolts securing the bracket to the valve cover using a 10mm socket. Set bracket aside.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
2. 2

   Access passenger side ignition coils (cylinders 1-4)
   Remove the plastic ignition coil cover screws on the passenger side valve cover using an 8mm socket. Lift the cover away to expose ignition coils for cylinders 1, 2, 3, and 4 (front to rear).
   Torque spec

   Cover Screws14 Nm (10 lb-ft)
3. 3

   Remove passenger side ignition coils
   For each coil on the passenger side: Press the locking tab and disconnect the electrical connector by pulling straight up on the connector body (not the wire). Remove the single 7mm ignition coil bolt. Firmly grasp the coil body and twist gently while pulling straight up to remove. If stuck, use a gentle rocking motion but do not pry.
   ⚠Coils may be stuck due to heat cycling. Do not use excessive force or pry against valve cover to avoid damage.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
4. 4

   Remove passenger side spark plugs
   Use compressed air or vacuum to clean debris from around each spark plug well. Using a 5/8-inch spark plug socket with extension, carefully remove all four spark plugs from the passenger side. Inspect threads in cylinder head for damage or carbon buildup.
5. 5

   Access driver side ignition coils (cylinders 5-8)
   Move to the driver side of the engine. Remove the plastic ignition coil cover screws on the driver side valve cover using an 8mm socket. Lift the cover away to expose ignition coils for cylinders 5, 6, 7, and 8 (front to rear).
   Torque spec

   Cover Screws14 Nm (10 lb-ft)
6. 6

   Remove driver side ignition coils
   For each coil on the driver side: Press the locking tab and disconnect the electrical connector by pulling straight up on the connector body. Remove the single 7mm ignition coil bolt. Firmly grasp the coil body and twist gently while pulling straight up to remove.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
7. 7

   Remove driver side spark plugs
   Use compressed air or vacuum to clean debris from around each spark plug well on the driver side. Using a 5/8-inch spark plug socket with extension, carefully remove all four spark plugs. Inspect all eight old spark plugs for wear patterns, oil fouling, or abnormal deposits that may indicate engine issues.
8. 8

   Install new spark plugs
   Apply a small amount of anti-seize compound to the threads of each new spark plug (avoid getting anti-seize on the electrode). Hand-thread each spark plug into the cylinder head to prevent cross-threading. Torque all eight spark plugs to specification using a torque wrench.
   ⚠Cross-threading spark plugs in aluminum heads can cause expensive damage. Always start threading by hand and ensure smooth engagement before using tools.
   Torque spec

   Spark Plugs - Aluminum Head20 Nm (15 lb-ft)
9. 9

   Install new ignition coils
   Apply a thin coat of dielectric grease to the inside of each new ignition coil boot where it contacts the spark plug ceramic insulator. Install each coil by aligning it over the spark plug and pushing down firmly until it seats completely. Install and torque the 7mm retaining bolt for each coil. Connect each electrical connector until it clicks into place.
   ℹ️Ensure coils are fully seated before tightening bolts. An improperly seated coil will cause misfires.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
10. 10

    Reinstall covers and brackets
    Reinstall both driver and passenger side ignition coil covers, torquing the cover screws to specification. Reinstall the passenger side upper engine cover support bracket and torque mounting bolts. Reinstall the main engine cover by aligning clips and pressing down until secured. Reconnect the negative battery terminal.
    Torque spec

    Cover Screws14 Nm (10 lb-ft)

    Mounting Bolts34 Nm (25 lb-ft)

Reassembly

1. Verify all electrical connectors are fully seated and locked
2. Ensure all covers and brackets are properly secured
3. Confirm no tools or parts were left in engine bay

Verification

• Reconnect battery and turn ignition to ON position without starting. Check for dashboard warning lights
• Start engine and listen for smooth idle with no misfires or rough running
• Allow engine to reach operating temperature and verify no misfire codes are present
• Use an OBD-II scanner to confirm no pending or active misfire codes (P0300-P0308)
• Perform a test drive under various loads to ensure proper acceleration and no hesitation

More procedures for this vehicle