how to diagnose a Honda Civic 9th Generation (2012-2015) that shakes when idling

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Engine Mounts (if needed)

• Tools Required: Socket set, torque wrench, pry bar, jack stands.
• Remove any components obstructing access to the engine mounts.
• Use a jack to support the engine slightly; avoid putting too much pressure.
• Remove the bolts securing the old engine mounts using the socket set.
• Replace with new engine mounts, ensuring they are oriented correctly.
• Torque the bolts to manufacturer specifications as listed in the service manual.

3. Replace Spark Plugs and Ignition Coils (if needed)

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the ignition coil connectors and unscrew the ignition coils.
• Remove the old spark plugs using a spark plug socket.
• Inspect the spark plug gap and replace with new plugs, applying anti-seize compound.
• Reinstall ignition coils, ensuring they click into place securely.
• Torque the plugs to the specified value from the manufacturer.

4. Clean or Replace Fuel Injectors (if needed)

• Tools Required: Fuel injector cleaning kit or replacement injectors, safety goggles.
• Relieve the fuel system pressure as per the service manual.
• Remove the fuel rail and injectors from the intake manifold.
• Use a fuel injector cleaner and follow the manufacturer’s instructions to clean the injectors.
• If replacing, install new injectors and ensure they seat properly.
• Reinstall the fuel rail and reconnect all electrical connections.