my Ford Explorer makes a loud noise when starting what's the problem

Solution

1. Preparation

• Gather tools: socket set, multimeter, OBD-II scanner, and safety glasses.
• Ensure the vehicle is in park and the ignition is off. Disconnect the battery to prevent electrical hazards.

2. Inspect and Clean Battery Connections

• Remove the negative terminal from the battery using the socket set.
• Clean any corrosion from the battery terminals and cable connections using a wire brush.
• Reattach the terminals securely, starting with the positive terminal, then the negative terminal.

3. Test the Starter Motor

• Reconnect the battery and attempt to start the engine.
• If the noise persists, remove the starter motor:
  • Disconnect electrical connections to the starter.
  • Unbolt the starter from its mounting using the socket set.
• Inspect the starter for damage or wear. If defective, replace the starter.

4. Inspect the Flywheel or Flexplate

• If the starter appears functional, inspect the flywheel or flexplate:
  • Remove the starter motor if not already done.
  • Turn the engine using a breaker bar on the crankshaft pulley to inspect the teeth of the flywheel/flexplate.
  • Look for any broken or missing teeth. If damaged, the flywheel/flexplate will need replacement.

5. Reassemble and Test

• Reinstall the starter motor and ensure all connections are tight.
• Reconnect the battery.
• Start the engine to confirm the noise has been resolved.