The objective of the present paper is to provide reliability analysis of 2-out-of-3 units of cylinders in an automobile engine by incorporating the idea of final testing before use for the repaired failed cylinder. The system of automobile engine consists of three identical cylinders. Initially all the three cylinders are operative and each of the unit has only two modes i.e. Normal and Complete failure. The system of automobile engine may operate satisfactorily if at least 2-out-of-3 cylinders are in operative mode but with the increased failure rate of the remaining cylinders. A single repair facility with discipline “FCFS” is considered. After each repair of failed cylinder it is sent for final testing where the repaired cylinder will be operative for a fixed period of time. If it works satisfactorily up to a fixed amount of time in testing then it goes for operation otherwise replace it by the new one. The probability that the repaired cylinder will found to be satisfactorily in testing is fixed. The failure time distribution of operative cylinder is exponential while the distribution of completing repair, final testing and replacement are general.