my Honda Pilot YF3 (2016-2022) has a check engine light and runs rough

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, vacuum gauge, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery before beginning any electrical work.

2. Address Ignition System

• Step 1: Remove the engine cover (if applicable) using a socket set.
• Step 2: Inspect the spark plugs:
  • Unscrew and remove each spark plug using a spark plug socket.
  • Check for signs of wear, fouling, or damage; replace as necessary.
• Step 3: Inspect ignition coils:
  • Disconnect the electrical connector from each coil.
  • Unscrew and remove each coil; check for cracks or corrosion; replace if faulty.

3. Fuel System Inspection

• Step 1: Connect the fuel pressure gauge to the fuel rail service port.
• Step 2: Turn the ignition key to the "ON" position (without starting) to check pressure reading.
  • Compare the reading with manufacturer specifications (typically around 30-45 psi for most Honda models).
• Step 3: If pressure is low, check the fuel pump and fuel filter for clogs or failures and replace as necessary.

4. Air Intake and Exhaust Check

• Step 1: Inspect the air filter:
  • Remove the air filter housing cover and take out the air filter; replace if dirty or clogged.
• Step 2: Check the intake manifold:
  • Look for any vacuum leaks or cracks; repair or replace as necessary.
• Step 3: Inspect the exhaust system:
  • Look for any blockages or damage; replace any damaged components.

5. Test Engine Vacuum

• Step 1: Connect the vacuum gauge to a vacuum source on the intake manifold.
• Step 2: Start the engine and observe the gauge reading.
  • A steady reading indicates normal operation; erratic readings suggest possible issues with valves or gaskets.