my Honda Pilot YF3 (2016-2022) engine feels rough when idling, what's causing it?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, multimeter.
• Allow the engine to cool before starting the repair process.
• Disconnect the battery to ensure safety when working with electrical components.

2. Address Fault Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Retrieve and note any error codes present.
• Clear the codes and test drive the vehicle to see if they return, indicating persistent issues.

3. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket wrench to remove spark plugs from the cylinders.
• Inspect each spark plug for signs of wear or fouling.
• Replace with new spark plugs according to manufacturer specifications (typically NGK or Denso).
• Torque the new spark plugs to the manufacturer’s recommended specification (usually around 13-16 lb-ft).

4. Check and Clean Fuel Injectors

• Disconnect the fuel pump relay to relieve fuel pressure.
• Disconnect fuel injector connectors carefully.
• Remove the injectors using a socket/ratchet.
• Clean with an ultrasonic cleaner or replace if necessary.
• Reinstall injectors and reconnect fuel lines ensuring no leaks.

5. Test Idle Air Control Valve (IACV)

• Locate the IACV on the throttle body.
• Disconnect the electrical connector and remove the IACV.
• Using a multimeter, test the resistance of the IACV according to service manual specifications.
• Clean the valve and reinstall it or replace if faulty.

6. Inspect Air Intake and Vacuum Lines

• Visually inspect the air intake for any obstructions or leaks.
• Check vacuum lines for cracks or disconnections.
• Replace any damaged hoses to ensure proper airflow to the engine.