Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHYUNDAI2013GENESIS COUPE 2.0T PREMIUMREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 40 (ENGINE CONTROL SYSTEM (DTC TROUBLESHOOTING) (2 OF 4) - 3.8L)DTC P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTEDSYSTEM INSPECTION

2013 Hyundai Genesis Coupe 2.0T Premium

System Inspection

2013 Hyundai Genesis Coupe 2.0T PremiumSECTION System Inspection

WARNING: This page is about a different car, the 2012 Hyundai Genesis Coupe. However, it is still accessible from the selected car via links, so may be relevant.

Check Spark Plug
1. Remove cylinder's spark plugs
2. Visually/physically inspect the following items:
  - Damaged insulation, worn electrodes, fouling from oil or fuel, loose terminals, and cracks
  - Check plug gap: 1.0 - 1.1 mm (0.039 - 0.043 in.)
  - Check if the spark plug for the relevant cylinder is lighter in color than the other plugs.
3. Has a problem been found in any of the above areas?
  YES
  - Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to "Check Air Leakage " procedure.
Check Air Leakage
1. Visually/physically inspect for air leakage in the following items: of the intake/exhaust system:
  - Vacuum hoses for splits, kinks and improper connections.
  - Throttle body gasket
  - Gasket between intake manifold and cylinder head
  - Seals between intake manifold and fuel injectors
  - Exhaust system between HO2S and Three way catalyst for air leakage
2. Has a problem been found in any of the above areas?
  YES
  - Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to "Check for air leakage in Positive Crankcase Ventilation Valve (PCV) " procedure.
Check for air leakage in Positive Crankcase Ventilation Valve (PCV)
1. Remove PCV valve from cylinder head cover by puling ventilation hose.
2. With engine idling block PCV valve opening.
3. Verify that vacuum is felt.
4. Remove PCV valve.
5. Blow through valve from port "A" and verify that air comes out of port "B".
6. Blow through valve from port "B" and verify that no air comes out of port "A".
7. Has a problem been found in any of the above areas?
  YES
  - Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to "Check Compression pressure " procedure.
Check Compression pressure
1. Warm up the engine to normal operating temperature.
2. Disconnect the spark plug cables and remove the spark plugs.
3. Crank the engine to remove any foreign material in the cylinders.
4. Put compression pressure gauge into spark plug hole.
5. Crank the engine with widely opened throttle valve and check compression pressure at each cylinder.
  Specification: 1323kPa (13.5 kg/cm² , 192 psi)
6. Is compression pressure for each cylinder displayed within specifications?
  YES
  - Go to "Check Timing " procedure.
  NO
  - Add a small amount of oil through the spark plug hole, and repeat above steps. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
  - If the compression remains the same, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure
Check Timing
1. Ignition "OFF"
2. Monitor these signal waveforms from Cam and Crankshaft Position Sensor are correctly aligned.
  Reference: The 17th of CKP signal from missing tooth is aligned with high of CMP signal.
  
  Fig 1: Scantool Display - Signal Waveforms From Cam & Crankshaft Position Sensor
  Courtesy of HYUNDAI MOTOR CO.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.