why does my Honda Pilot YF3 (2016-2022) have a rough idle when in drive

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, vacuum gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect ignition coils from the spark plugs.
  3. Use a spark plug socket to remove old spark plugs.
  4. Inspect the spark plugs for wear; replace them with OEM equivalents if needed (set gap as per manufacturer specifications).
  5. Reinstall ignition coils and the engine cover.

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

• Sub-steps:
  1. Locate the IACV on the throttle body.
  2. Disconnect the wiring harness and remove the mounting screws using a socket set.
  3. Clean the valve with throttle body cleaner; if damaged, replace it with a new unit.
  4. Reinstall the IACV and reconnect the wiring harness.

4. Check for Vacuum Leaks

• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the intake manifold and hoses.
  2. Inspect all vacuum lines for cracks or disconnections.
  3. Replace any damaged hoses with OEM parts.
  4. Ensure proper seating of the intake manifold.

5. Test Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check fuel pump pressure against specifications.
  2. Inspect and replace the fuel filter if it hasn't been replaced within the recommended interval.
  3. If fuel pressure is low, investigate the fuel pump and replace if necessary.