how to troubleshoot engine misfire in my Genesis G70 IG (2017-2023)

Learn how to diagnose and fix engine misfire issues in Genesis G70 IG (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the battery to ensure safety while working.
• Ensure the engine is cool before starting work.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the ignition coil connectors and bolts.
• Carefully pull out the ignition coils.
• Remove the old spark plugs using a spark plug socket.
• Inspect the spark plug gaps and replace with new spark plugs at manufacturer-recommended gap settings.
• Apply a small amount of dielectric grease to the inside of the ignition coil boots.
• Reinstall the ignition coils and connectors.

3. Check and Replace Ignition Coils

• If ignition coils were found faulty during diagnosis:
• Tools Required: Socket set, torque wrench.
• Remove the faulty ignition coils as described in the previous step.
• Install new ignition coils, ensuring they are seated properly.
• Torque the bolts to the manufacturer’s specifications.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "On" position without starting the engine and check the pressure.
• If pressure is below specifications, consider replacing the fuel pump or checking the fuel filter.

5. Vacuum Leak Inspection

• Visually inspect vacuum hoses for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify any leaks by observing changes in idle.

6. Compression Test

• Tools Required: Compression tester.
• Remove spark plugs and insert the compression tester into each cylinder.
• Crank the engine for a few revolutions and record the pressure.
• Compare readings across all cylinders; replace any components as necessary if readings are low.