Complete major tune-up service including spark plugs, air filter, cabin filter, engine oil and filter change, fuel filter inspection, throttle body cleaning, and ignition system inspection for the 2.5L I4 engine.

Warnings

Tools required

Parts

• Spark plugs × 4 — Use OEM specification - typically iridium (4 required)
• Engine air filter × 1 — 28113-D3300 or equivalent
• Cabin air filter × 1 — 97133-D3000 or equivalent
• Engine oil filter × 1 — 26300-35503 or equivalent
• Oil drain plug crush washer × 1 — 21513-23001 or equivalent
• Ignition coil boots (if damaged) × 4 — Use OEM specification

Fluids

• Hyundai Genuine 0W-20 Engine Oil — 5 qt

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind rear wheels
3. Allow engine to cool completely (minimum 2 hours if recently driven)
4. Gather all tools, parts, and fluids before starting
5. Disconnect negative battery terminal and secure cable away from battery post
6. Raise front of vehicle and secure on jack stands if needed for oil change access

Procedure

1. 1

   Remove engine cover and air intake system
   Remove the plastic engine cover by pulling upward on the front clips and lifting off. Disconnect the mass airflow sensor electrical connector. Release the air box clips and remove the intake tube from the throttle body. Remove the complete air box assembly for access to engine components.
   Torque spec

   Air Box Clips5 Nm (4 lb-ft)
2. 2

   Replace engine air filter
   Open the air box housing by releasing the remaining clips. Remove the old air filter element and inspect the housing for debris. Clean housing interior with a clean cloth if needed. Install new air filter ensuring proper seating in the housing. Reinstall air box cover and secure clips.
   Torque spec

   Air Box Clips5 Nm (4 lb-ft)
3. 3

   Replace cabin air filter
   Open the glove box and remove contents. Squeeze sides of glove box to release stops and lower fully. Remove cabin air filter cover located behind glove box. Slide out old cabin filter noting airflow direction arrow. Install new filter with airflow arrow pointing in same direction. Reinstall cover and reset glove box.
4. 4

   Remove ignition coils and inspect
   Locate the four ignition coils on top of the engine. Disconnect the electrical connector from each coil by pressing the release tab. Remove the mounting bolt from each coil. Carefully pull each coil straight up with a slight twisting motion to break the seal. Inspect coil boots for cracks, carbon tracking, or damage. Apply dielectric grease to inside of boots if reusing.
   ⚠Do not pull on wires when removing coil connectors. Press release tab and pull on connector body only.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
5. 5

   Remove and replace spark plugs
   Using a spark plug socket with extension, remove each spark plug by turning counterclockwise. Inspect old plugs for wear, carbon buildup, or abnormal conditions which may indicate engine issues. Check gap on new spark plugs (should be pre-gapped). Apply a small amount of anti-seize to plug threads (avoid getting on electrode). Hand-thread new plugs clockwise until finger-tight, then torque to manufacturer specification (typically 15-20 Nm for this engine - verify with plug manufacturer recommendations as not in torque database).
   ⚠Do not over-torque spark plugs as this can damage aluminum cylinder head threads. Follow plug manufacturer torque specification.
   ℹ️If a plug is difficult to remove, apply penetrating oil and wait 15 minutes before attempting again.
6. 6

   Reinstall ignition coils
   Align each ignition coil with its corresponding spark plug. Press coil firmly down onto spark plug until fully seated. Install and torque the coil mounting bolt. Reconnect the electrical connector to each coil, ensuring it clicks into place. Verify all four coils are secure and properly connected.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
7. 7

   Clean throttle body
   With air intake removed, access the throttle body. Spray throttle body cleaner onto a clean cloth (not directly into throttle body). Wipe the throttle plate and bore clean, rotating the throttle plate by hand if needed for full access. Remove all carbon deposits and residue. Allow to air dry completely before reassembly.
   ⚠Do not force throttle plate open. Use gentle pressure only to avoid damaging electronic throttle control mechanism.
8. 8

   Drain engine oil
   Position oil drain pan under engine oil drain plug located on bottom of oil pan. Remove drain plug using appropriate socket, allowing oil to drain completely (approximately 10 minutes). Inspect drain plug threads and oil pan threads for damage. Install new crush washer on drain plug. Reinstall and torque drain plug to specification.
   ⚠Used engine oil may still be warm. Wear gloves to protect skin from hot oil and contaminants.
   Torque spec

   Oil Drain Plug35 Nm (26 lb-ft)
9. 9

   Replace oil filter
   Locate oil filter on engine block (typically driver side). Position drain pan underneath. Use oil filter wrench to remove old filter by turning counterclockwise. Clean the filter mounting surface on engine block. Apply a thin film of fresh oil to the rubber gasket of new filter. Hand-thread new filter clockwise until gasket contacts mounting surface, then tighten an additional 3/4 turn by hand. Do not use filter wrench to install.
10. 10

    Refill engine oil and check level
    Lower vehicle if raised. Remove oil filler cap on top of engine. Using funnel, add 4.5 quarts of 0W-20 engine oil. Replace oil filler cap. Wait 2 minutes, then check oil level with dipstick. Add remaining oil in small increments until level reaches the full mark. Do not overfill.
11. 11

    Reassemble air intake system
    Reinstall air box assembly and secure to mounting location. Reconnect intake tube to throttle body and tighten clamp. Reconnect mass airflow sensor electrical connector. Reinstall engine cover by aligning clips and pressing down firmly until all clips engage.
    Torque spec

    Air Box Clips5 Nm (4 lb-ft)
12. 12

    Reconnect battery and perform system reset
    Reconnect negative battery terminal and torque to specification if applicable. Turn ignition to ON position (without starting engine) for 10 seconds to allow throttle body relearn procedure. Turn ignition OFF, wait 10 seconds, then repeat two more times. This allows the ECU to relearn idle position after throttle body cleaning.

Reassembly

1. Verify all electrical connectors are fully seated and locked
2. Confirm engine cover is properly secured with all clips engaged
3. Double-check oil drain plug and filter are tight
4. Ensure no tools or materials are left in engine bay

Verification

• Start engine and verify it starts smoothly without misfires or rough idle
• Check for oil leaks around drain plug and oil filter while engine is running
• Allow engine to reach operating temperature and verify smooth idle (may take 5-10 minutes for ECU to fully adapt)
• Verify check engine light does not illuminate
• Check oil level again after engine reaches operating temperature and add if needed
• Test drive vehicle to confirm smooth acceleration and no hesitation or misfires under load
• Re-check all fluid levels after test drive

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