If I run my engine till its at running temp and shut it off it does not allways restart for me. I'll have to wait like ten mins before it will restart. Does anyone know why it would do this or know how to fix it. The engine is a b18a block bored 25 over pr3 head itr cams and pistons ferrea valves msd dc header and mugen spec ecu also it has 3 o2 sensors so if anyone can tell me why that would be cool. thanks.

 

a dying main relay sometimes will do that

 

I replaced mine with another used one, is there any other possiblities

 

hard to tell using a used one, that one could ahve the same problems