A 52 year old woman told police she was having mechanical problems with her vehicle before it slammed into the front of a 7-11. It happened Monday morning on Sandrock Road in Serra Mesa. Four people were hurt including a child when the car drove through the front wall of the store. One man was pinned against a refrigerator inside the store. Another man was hurt in the parking lot. Injuries range from minor to moderate. The woman was not hurt or arrested. Police say there was no sign of drugs or alcohol.