案情经过我辖区一家二类汽车修理厂承修花都一单位的一辆依维柯中型客车,车主报修内容:发动机异响及无力。该厂对车辆检查后提出的修理方案是“发动机大修”,工时费用1800元。此方案经车主单位确认后,厂方开出维修估价单,双方签字后即开始施工。该车发动机大修竣工出厂时厂方签发了3个月的质量保证期凭证给车主。但出厂一周后该车出现发动机冒黑烟且 Case after a second class car repair factory in my area of ​​Huadu, a unit of Iveco medium-sized bus repair, the owners repair content: the engine noise and weakness. The factory after the vehicle inspection program proposed repair is “engine overhaul”, the working hours cost 1800 yuan. This program was confirmed by the owner, the factory out of maintenance valuation orders, the two sides began construction after signing. The car engine overhaul completed factory issued a three-month warranty period certificate to the owner. However, one week after leaving the factory, the car ran out of black smoke