why does my Genesis G70 have a rough idle after warm-up

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect ignition coil connectors and remove the coils.
• Check the spark plugs for wear; replace if necessary (gap should be according to manufacturer specifications).
• Reinstall new or inspected ignition coils, ensuring they are seated properly.
• Reconnect connectors and engine cover.

3. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, screwdriver
• Remove the intake duct to access the throttle body.
• Spray throttle body cleaner onto a cloth and wipe the throttle plate and housing.
• Ensure the throttle plate can open and close freely.
• Reinstall the intake duct securely.

4. Check for Vacuum Leaks

• Tools Required: Smoke machine (optional), hose clamp, vacuum gauge
• Inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine to check for leaks (if available).
• Replace any damaged hoses.
• Tighten any loose connections.

5. Test the Fuel System

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the “ON” position without starting the engine to check fuel pressure.
• Compare the reading to manufacturer specifications; replace the fuel pump or filter if pressure is low.