my Honda Pilot's engine sounds like it's knocking what could be wrong

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, mechanic's stethoscope, compression tester.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical issues during inspection.

2. Check and Change Engine Oil

• Sub-steps:
  1. Remove the oil dipstick and check the oil level; add oil if low.
  2. If the oil is dirty or contaminated, drain the old oil using a wrench to remove the oil pan plug.
  3. Replace the oil filter using an oil filter wrench.
  4. Refill the engine with the manufacturer-recommended oil type and quantity (e.g., 5W-20 for Honda Pilot).
  5. Start the engine and let it run for a few minutes; check for leaks.

3. Inspect and Replace Worn Components

• Sub-steps:
  1. If the knocking persists, inspect the spark plugs and replace them if worn or fouled.
  2. Check the timing chain or belt; replace it if it shows signs of wear or if it is out of alignment.
  3. If engine mounts are found to be damaged, replace them to reduce vibration and noise.
  4. If the compression test reveals low compression in any cylinders, consider further inspection or rebuilding that cylinder head.