One problem related to engine noise has been reported for the 1999 Saturn SC1. The most recently reported issues are listed below.
I took my 1999 Saturn Sc1 in to the dealer for a resonator replacement and wheel rotation and balance at 49,091 miles. The dealer called me to say the upper engine mount had to be replaced. Last week, when we took my wife's 1996 sl1 in for engine noise, we were also told we had to replace the engine mount. With my 1999 Sc1, it has been taken in for all regularly scheduled maintenance -- why does the engine mounts on Saturns need replacing?.