WHEN THE VEHICLE WAS STARTED, THERE WAS AN EXPLOSION AND THE ENGINE CAUGHT ON FIRE. THE IGNITION COMPONENTS IN THE FIREWALL AREA OVERLOADED OR SHORTED OUT RAPIDLY WHICH CAUSED THE PLASTIC COVER AND PARTS AROUND IT TO INCINERATE. POSSIBLE FUEL LEAK, HOSES, OR SEALS DAMAGED BY EXPLOSION IGNITING FUEL. GENERAL MOTORS OFFERED TO REPLACE VEHICLE. INSTEAD SETTLED CLAIM. REPLACED NEW IMPALA. *JB *CB *JB