what could be causing my Honda Civic 11th Generation (2022-Present) to misfire under load

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, torque wrench, vacuum gauge.
• Ensure the vehicle is parked on a level surface.
• Disconnect the battery to avoid electrical shorts while working on the ignition system.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover using a socket set.
• Disconnect the ignition coil connectors and remove the coils.
• Remove the spark plugs using a spark plug socket; inspect for wear or carbon buildup.
• Replace spark plugs with OEM or recommended aftermarket parts, ensuring proper gap specifications.
• Reinstall the ignition coils and reconnect the connectors.

3. Test and Replace Ignition Coils (if necessary)

• Check the ignition coil resistance using a multimeter based on manufacturer specifications.
• If any coils are outside the specified range, replace them with new ones.
• Torque the bolts to the specified value when reinstalling.

4. Check and Replace Fuel Injectors (if necessary)

• Remove the fuel rail by loosening the bolts and carefully lifting it away from the engine.
• Inspect and clean the fuel injectors or replace them if they are clogged or malfunctioning.
• Reinstall the fuel rail and ensure all connections are secure.

5. Inspect Air Intake and Vacuum Lines

• Check the air filter and replace it if clogged.
• Inspect the intake manifold and throttle body for carbon buildup; clean if necessary.
• Replace any damaged or cracked vacuum lines.