None start

[Paulwalsh]

This is completely random but does anybody know of any reason why car won’t start , started absolutely fine for last 18 months been on 20 plus dyno days everything fine until other day wouldn’t start would get 360 on crank but that’s it and today just says turn, I’ve check all wires earths even replaced crank and cam sensors but nothing. I can bring up crank sensor which is an07 and cam sensor an05 and when I crank it’s reading but ultimately I’ve not changed anything just decided not to work. Any help I’ll try anything. Thanks