TL*THE CONTACT OWNS A 1997 FORD EXPEDITION. WHILE DRIVING APPROXIMATELY 10 MPH, THE CONTACT HEARD A LOUD NOISE UNDERNEATH THE VEHICLE. SHE PULLED TO THE SIDE OF THE ROAD AND INSPECTED UNDERNEATH THE VEHICLE AND HOOD. THE CONTACT SMELLED A BURNING ODOR UNDERNEATH THE HOOD. THERE WERE NO WARNING INDICATORS ILLUMINATED ON THE INSTRUMENT PANEL. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC AND THEY STATED THAT THE FAILURE WAS RELATED TO A DISCONNECTED SPARK PLUG IN THE ENGINE. THE VEHICLE WAS REPAIRED FOR THE MALFUNCTION. ON TWO SEPARATE OCCASIONS, THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC FOR IDENTICAL FAILURES, BUT THERE WERE NO RESOLUTIONS. THE VIN WAS UNKNOWN. THE FAILURE MILEAGE WAS 96,000.