saba

hi guys i just changed my engine from my fc 91 turbo and know when i start the car it runs for like 5 min and after that it juste stops i know that i read somewhere that they say that it could be the water temperature sensor i just want to know if someone had the same problem and after 5 min when the engine has stoped i cant start it again its like something its holding it like theres no more juice in the battery then wen it cools down it can start again. its a rhd rx7 i dont think there something that different.The mecanic in the mazda dealer told me that the engine is finish i had to change it i hope no plizzz help me