what causes rough idle in my Honda CR-V Sixth Generation (2023-present) when cold

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coils and remove them using the socket set.
  3. Inspect the spark plugs; replace them if worn or fouled. Torque new plugs to manufacturer's specification (usually around 13-16 lb-ft).
  4. Reinstall ignition coils and ensure connections are secure.

3. Clean or Replace the Idle Air Control Valve (IACV)

• Sub-steps:
  1. Locate the IACV on the intake manifold.
  2. Remove the electrical connector and mounting screws using the socket set.
  3. Clean the IACV with throttle body cleaner; if heavily soiled, consider replacing it.
  4. Reinstall the IACV and reconnect the electrical connector.

4. Inspect and Clean Air Intake

• Sub-steps:
  1. Remove the air intake hose using the screwdriver.
  2. Inspect the air filter; replace if dirty or clogged.
  3. Clean the throttle body using throttle body cleaner and a soft cloth.
  4. Reassemble the air intake system securely.

5. Verify Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (do not start) and observe the fuel pressure reading; it should match manufacturer specifications (typically around 40-50 PSI).
  3. If pressure is low, inspect the fuel pump and fuel filter for potential issues.