This procedure covers removal and replacement of ignition coil packs on the 2018-2024 Honda Accord 1.5L Turbo engine, including spark plug inspection and installation.

Warnings

Tools required

Parts

• Ignition coil pack × 4 — Honda 30520-5BA-A01 or equivalent
• Spark plugs (if replacing) × 4 — NGK DILKAR8J8S or Honda OEM

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level surface and engage parking brake
3. Open hood and secure with prop rod
4. Remove engine cover by pulling upward on the cover to release the mounting grommets
5. Disconnect negative battery terminal and wait 3 minutes to discharge electrical system

Procedure

1. 1

   Locate and identify ignition coils
   Identify the four ignition coils mounted vertically on the cylinder head. They are located in the center of the engine with electrical connectors on top. Note their positions: cylinders 1-4 run from the timing belt side to the transmission side.
2. 2

   Disconnect electrical connectors
   Press the locking tab on each coil pack electrical connector and pull straight up to disconnect. Do not pull on the wires themselves. If connectors are stuck, gently wiggle side-to-side while pulling upward.
   ⚠Do not force connectors as the locking tabs can break easily
3. 3

   Remove ignition coil mounting bolts
   Using a 10mm socket, remove the single bolt securing each ignition coil. Store bolts in a clean location to prevent contamination.
   Torque spec

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

   Extract ignition coils
   Grasp each coil pack firmly and pull straight up with steady pressure. The coil may be tight in the spark plug tube due to the rubber boot seal. Rock gently side-to-side if needed, but avoid excessive force. Inspect the rubber boot on each coil for tears, cracks, or carbon tracking.
   ⚠If the rubber boot separates from the coil and remains in the spark plug tube, use needle-nose pliers to extract it completely
5. 5

   Clean spark plug tubes
   Use compressed air or a clean lint-free cloth to remove any debris, oil, or dirt from inside the spark plug tubes. Ensure no foreign material will fall into the cylinders during spark plug removal.
   ⚠If oil is present in the spark plug tubes, the valve cover gasket may be leaking and should be inspected
6. 6

   Remove spark plugs (if replacing)
   Using a 5/8-inch or 14mm spark plug socket with extension, carefully loosen each spark plug. Remove plugs completely and inspect electrodes and threads. Check gap on new plugs (should be 0.028-0.031 inches for this engine).
   ⚠Do not drop spark plugs or impact the electrode as this will damage the gap and performance
   Torque spec

   Spark Plugs - Aluminum Head20 Nm (15 lb-ft)
7. 7

   Apply anti-seize to new spark plugs
   Apply a small amount of anti-seize compound to the threads of each new spark plug. Use only a thin coating on the first 2-3 threads; do not apply near the electrode end or allow anti-seize to contact the electrode.
   ⚠Excessive anti-seize can contaminate the spark plug and cause misfires
8. 8

   Install spark plugs
   Thread each spark plug by hand into the cylinder head to ensure proper thread engagement. Once hand-tight, use the torque wrench and spark plug socket to tighten to specification. Work in a crisscross pattern if replacing multiple plugs.
   ⚠️Cross-threading spark plugs in the aluminum cylinder head will require expensive head repairs. Always start threads by hand
   Torque spec

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

   Prepare new ignition coils
   Inspect new coil pack rubber boots for damage. Apply a thin coating of dielectric grease inside each rubber boot and around the spark plug terminal area to prevent moisture intrusion and ensure good electrical contact.
10. 10

    Install ignition coils
    Align each coil pack with its corresponding spark plug and push down firmly until the coil seats completely in the cylinder head. The coil should sit flush with the valve cover surface. Install the mounting bolt finger-tight first, then torque to specification.
    Torque spec

    Ignition Coil Bolts8 Nm (6 lb-ft)
11. 11

    Reconnect electrical connectors
    Push each electrical connector onto the corresponding coil pack until you hear and feel a positive click. Gently tug on each connector to verify it is fully locked in place.
12. 12

    Reconnect battery and reinstall engine cover
    Reconnect the negative battery terminal. Position the engine cover and press down firmly on all mounting points until the grommets seat properly into the valve cover mounting posts.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify engine cover is properly secured at all mounting points
3. Double-check that no tools or parts were left in the engine bay

Verification

• Start the engine and verify it runs smoothly without misfires or rough idle
• Check for any warning lights on the instrument cluster, particularly the check engine light
• Listen for any abnormal clicking or arcing sounds from the coil area
• Allow engine to reach operating temperature and verify smooth operation under light acceleration
• If a check engine light appears, use a scan tool to verify no misfire codes are present (P0300-P0304)

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