Why does my Ford Explorer 2021 have a burning smell coming from the engine?

Problem Diagnosis: Burning Smell from Engine in Ford Explorer 2021

Possible Causes

1. Oil Leak: Oil dripping onto hot engine parts, resulting in burning oil smell.
2. Coolant Leak: Coolant leaking onto hot engine components causing steam or burning smell.
3. Electrical Short: Wires or insulation melting due to electrical issues.
4. Belt or Hose Issue: Worn or slipping serpentine belt or hoses can create friction and burning smell.
5. Brakes: If the burning smell is more pronounced during braking, it could be brake pads overheating.

Step 1: Preliminary Inspection

• Tools Required: Flashlight, gloves.
• Open the hood and visually inspect for any visible leaks (oil, coolant) or smoke.
• Check the engine oil level and coolant level to ensure they are within normal ranges.

Step 2: Check for Oil Leaks

• Tools Required: Oil dipstick, paper towels.
• Use the dipstick to confirm oil level is adequate.
• Check the engine oil for burnt smell or dark color, indicating it might be burnt.
• Look for oil stains or residue on the engine block or under the vehicle.

Step 3: Inspect Coolant System

• Tools Required: Pressure tester (optional), flashlight.
• Inspect coolant hoses for any signs of leaks or damage.
• Check the radiator and reservoir for any leaks.
• If applicable, perform a pressure test on the system to check for leaks.

Step 4: Examine Electrical Components

• Tools Required: Multimeter, wire inspection tool.
• Check wiring harnesses and connections for frayed wires or burnt insulation.
• Look for any blown fuses or melted connectors that could indicate electrical shorts.

Step 5: Inspect Serpentine Belt and Hoses

• Tools Required: Belt tensioner tool, pry tool.
• Check the condition of the serpentine belt for cracks, wear, or damage.
• Inspect hoses for any signs of wear or deterioration that could indicate they are burning.

Step 6: Check Brakes

• Tools Required: Jack, jack stands, lug wrench.
• If the burning smell occurs during braking, check brake pads and rotors for excessive wear or heat.
• Inspect the brake fluid level and look for any leaks around the brake system.

Repair Instructions

Repair Oil Leak

1. Identify Source: Use the flashlight to identify where the oil is leaking from.
2. Replace Gasket or Seal: If a gasket or seal is leaking, remove the old gasket, clean the surface, and install a new gasket or seal.
3. Top Off Oil: Refill engine oil if it is low.

Repair Coolant Leak

1. Locate Leak: Identify the source of the coolant leak.
2. Replace Components: Replace any damaged hoses or the radiator if needed.
3. Re-test: Use a pressure tester to ensure no further leaks occur after repairs.

Repair Electrical Issues

1. Replace Wires: If frayed or burnt wires are found, cut out the damaged section and splice in new wire.
2. Check Connections: Ensure all connectors are clean, tight, and free of corrosion.

Replace Serpentine Belt

1. Remove Old Belt: Use the belt tensioner tool to relieve tension and remove the old belt.
2. Install New Belt: Route the new belt according to the routing diagram and ensure it is seated properly.

Brake Maintenance

1. Inspect and Replace Pads: If brake pads are worn, replace them with new pads and check the rotors for excessive wear.
2. Bleed Brakes: After replacing brake components, bleed the brake system to ensure proper operation.

Conclusion

After completing the necessary repairs, start the engine and monitor for any further burning smells or unusual sounds. If the burning smell persists, further diagnostic steps or a visit to a professional mechanic may be required. Always ensure safety precautions are taken when working on automotive systems.