how to diagnose a misfire in my Honda Accord 9th Generation (2013-2017)

Learn how to diagnose and fix engine misfire issues in Honda Accord 9th Generation (2013-2017). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and materials including OBD-II scanner, socket set, multimeter, fuel pressure gauge, and compression tester.
• Disconnect the battery to prevent electrical short circuits.
• Allow the engine to cool before starting work.

2. Replace Spark Plugs

• Remove the ignition coil covers using a socket set.
• Carefully disconnect the ignition coils from the spark plugs.
• Remove the old spark plugs using a spark plug socket and inspect their condition.
• Install new spark plugs, ensuring they are gapped correctly according to manufacturer specifications (usually around 0.044 inches for most Honda engines).
• Reattach the ignition coils and covers, tightening to the manufacturer’s torque specifications.

3. Inspect and Replace Ignition Coils (if necessary)

• If a faulty ignition coil is identified, remove it by unbolting and gently pulling it from the spark plug.
• Install the new ignition coil, ensuring it seats securely and reconnect the electrical connector.
• Repeat for each cylinder as necessary based on diagnosis.

4. Clean or Replace Fuel Injectors (if necessary)

• Remove the fuel injector connectors and the fuel rail as needed.
• Inspect the injectors for clogging or wear. Clean using a dedicated fuel injector cleaner or replace if heavily fouled.
• Reinstall the fuel rail, ensuring all seals are intact and reconnect the fuel injector connectors.

5. Compression Test (if necessary)

• Remove spark plugs to access cylinders.
• Insert the compression tester into the spark plug hole and crank the engine for a few seconds, recording the pressure reading.
• Compare results to manufacturer specifications (typically around 180-210 psi).
• If compression is low in any cylinder, further investigation into internal engine components may be required.