One problem related to engine knocking noise has been reported for the 1999 Buick Regal. The most recently reported issues are listed below.
4th engine service recall 15757 was performed at dealership on March 25, 2016. On may 13, 2016, attempted to started car which was parked on suburban street at 5 a. M. The vehicle had not been driven for several days. Loud bang sound. Engine ignited. Flames shot out onto street surface. Driver was able to evacuate and contain flames until police and fire department responded to call. Battery had to be disconnected. Engine casing was blown off top of engine.