One problem related to engine noise has been reported for the 2007 Saturn ION. The most recently reported issues are listed below.
Car cuts off a/c wont work unless on max and makes noise when turning. Cpu issue like rpm fluctuates I think its the fuel pump and gas pedal assembly cpu problem and its jerks alot dealer said aint nothing the can do bout it but they suppose to fix it with in 30 days of purchase time. So it cuts off while riding and jerks while im on the breaks.