Hello. I changed the pvc valve. The car started, I did 50km but I didn't start the engine anymore. The starter is running, the fuel pump can be heard. Torque pro shows P2104 P2107 error. I checked the throttle and it looks good. I have a diagnosis of a mechanic about a crankshaft position sensor failure. He claims that an error will not always be reported. The car is waiting for repair. What do you think could happen that the car does not start? The pvc valve I bought is not gray but black. Fits perfectly to the engine cover. This valve is not Mazda but Ford Mustang 3.7 motorcraft. I think it's the same valves and it's not a problem.