TL*THE CONTACT OWNS A 1997 PONTIAC GRAND PRIX. WHEN THE CONTACT STARTED THE VEHICLE SHE NOTICED A LOUD POPPING SOUND IN THE FRONT END OF THE VEHICLE AND AFTER A FEW MINUTES, SHE NOTICED SMOKE COMING FROM THE ENGINE. THE VEHICLE HAS NOT BEEN DIAGNOSED BY THE DEALER AND THERE WERE NO PRIOR WARNINGS. THE CURRENT AND FAILURE MILEAGES WERE 250,000.