Mariah Z260 engine failure on mercruiser 7.4 V8
 

Hi, I took my Z260 out for the third time with no problems until I gave the engine a rev up to charge the batteries as they were low next thing I hear a loud click and the engine just died

I have replaced the ecm, fuel pump, injector sensor and map sensor and checked the wiring and relays but no joy can anyone help please

Re: Mariah Z260 engine failure on mercruiser 7.4 V8
 

Need a little more information. I assume it is the 7.4 MPI and also assume that it cranks but does not fire? Have you put a fuel pressure gage on the rail to make sure it has fuel pressure? Does it have spark? Did you ever determine what the loud click was? Have you done a compression check?

Re: Mariah Z260 engine failure on mercruiser 7.4 V8
 

it cranks but wont fire and it sparks, fuel pressure is there, but no ground or earthing through the brain to the injectors to let the fuel in