This procedure covers the removal and replacement of ignition coils on a 2015 Kia Forte with the 1.8L I4 engine, including access to spark plugs.

Warnings

Tools required

Parts

• Ignition coil assembly × 4 — 27301-2E000 or equivalent
• Spark plugs (if replacing) × 4 — 18854-11070 or NGK equivalent

Preparation

1. Ensure engine is cool to the touch
2. Open hood and secure with prop rod
3. Remove engine cover by pulling upward on perimeter clips (no tools required)
4. Identify all four ignition coil locations on top of valve cover

Procedure

1. 1

   Disconnect ignition coil electrical connectors
   Press down on the locking tab of each coil connector and pull straight up to disconnect. There are four connectors, one per cylinder. Note the cylinder positions: cylinders are numbered 1-4 from timing belt side to transmission side.
2. 2

   Remove ignition coil mounting bolts
   Using a 10mm socket with extension, remove the single mounting bolt from each ignition coil. Keep bolts organized by cylinder position if they show wear patterns.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
3. 3

   Extract ignition coils from valve cover
   Grasp each coil firmly and pull straight upward with a slight twisting motion to break the seal. The coil boots fit into deep spark plug wells. If a coil is stuck, gently rotate while pulling - do not pry against the valve cover as it may crack.
4. 4

   Inspect coil boots and spark plug wells
   Examine the rubber boot on each coil for cracks, oil contamination, or carbon tracking. Check inside spark plug wells for oil accumulation (indicates valve cover gasket failure) or debris. Clean wells with compressed air if available.
   ⚠If oil is present in spark plug wells, valve cover gasket replacement is required to prevent future coil failure.
5. 5

   Remove spark plugs (if replacing)
   If replacing spark plugs, use a 16mm spark plug socket with extension to remove each plug. Turn counterclockwise approximately 8-10 full turns. Inspect old plugs for abnormal wear patterns that may indicate engine issues.
   ℹ️Gap new spark plugs to 0.039-0.043 inches (1.0-1.1mm) before installation, even if pre-gapped.
6. 6

   Install new spark plugs (if applicable)
   Apply a thin coat of anti-seize compound to spark plug threads (avoid getting compound on electrode). Thread plugs in by hand to prevent cross-threading, then torque to specification using spark plug socket and torque wrench. Install all four plugs before proceeding.
   ⚠️Over-torquing spark plugs in aluminum heads can strip threads and require costly head repair. Use torque wrench, not impact tools.
   Torque spec

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

   Prepare new ignition coils
   Apply a thin layer of dielectric grease to the inside of each new coil boot where it contacts the spark plug insulator. This prevents boot seizure and moisture intrusion. Do not apply grease to electrical terminals.
8. 8

   Install new ignition coils
   Align each coil with its spark plug well and press down firmly until the coil seats completely. The boot must fully engage the spark plug. A distinct 'click' or solid stop indicates proper seating. Ensure coil mounting holes align with valve cover bolt holes.
9. 9

   Install and torque coil mounting bolts
   Thread each coil mounting bolt by hand first to prevent cross-threading. Using a 10mm socket and torque wrench, tighten all four bolts to specification in a criss-cross pattern (cylinders 1-4-2-3).
   Torque spec

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

    Reconnect electrical connectors
    Push each electrical connector onto its corresponding coil until the locking tab clicks into place. Verify connection by gently tugging on each connector - it should not pull free. Ensure wiring harness is routed away from hot exhaust components.
11. 11

    Reinstall engine cover
    Align engine cover mounting grommets with valve cover studs and press down firmly around perimeter until all clips snap into place. Ensure cover is fully seated and secure.

Reassembly

1. Double-check all electrical connectors are fully engaged and locked
2. Verify no tools or parts are left in engine bay
3. Ensure engine cover is properly secured

Verification

• Start engine and listen for smooth idle with no misfires or hesitation
• Check for illuminated check engine light or flashing MIL (indicates active misfire)
• Rev engine to 2000-2500 RPM briefly to confirm smooth acceleration
• Scan for diagnostic trouble codes with OBD-II scanner if available - there should be no P030X misfire codes
• Inspect around coils for any signs of arcing or unusual sounds during engine operation
• Test drive vehicle for 5-10 minutes to verify normal performance under load

More procedures for this vehicle