my Honda Accord 10th Generation (2018-2022) runs rough at idle what should I check

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Clean Throttle Body

• Remove the air intake duct connected to the throttle body using a socket set.
• Use throttle body cleaner and a clean cloth to carefully clean the throttle plate and surrounding areas.
• Reassemble the air intake duct and reconnect the negative battery terminal.

3. Inspect and Replace Spark Plugs

• Remove the ignition coils by unbolting them and disconnecting the electrical connectors.
• Extract the spark plugs using a spark plug socket and ratchet.
• Inspect the spark plugs for wear; replace them if necessary (gap to manufacturer's specification).
• Reinstall the spark plugs and ignition coils, ensuring they are properly connected.

4. Check for Vacuum Leaks

• Visually inspect vacuum hoses for cracks or disconnections.
• Use a smoke machine to check for leaks around the intake manifold and hoses.
• Replace any damaged hoses or seals.

5. Test Fuel System

• Use a fuel pressure gauge to check fuel pressure at the rail; compare it with manufacturer specifications.
• If pressure is low, inspect the fuel pump and filter for clogs or malfunctions.
• Clean or replace fuel injectors if they are not functioning properly.