My 5.7 MPI will turn over but will not run; however if I relieve the oil pressure by opening the oil pressure port on the top rear of the engine near the distributor the engine will start. Only problem is I have oil everywhere.
Serial# 0M620208, 2004 Searay 240 Sundeck. Yes, the serial number is for a 5.0 MPI, I upgraded the engine block and reflashed the ECM555.
I checked the oil pressure sensor wiring, my wiring diagram shows two wires (DK BLU/BLK and BLK/PNK) which are there, but there is also a GRY wire as well.
The sensor is a Mercruiser oil pressure sensor, part#881879-6
My understanding is the oil pressure switch is an on/off switch that supplies power back to the ECM555 and then the ECM applies power to the fuel pump relay.
The fuel pump will prime when the key is turned.
Any thoughts on why it appears the switch is operating backward or reversed?
Thanks
Joe
Serial# 0M620208, 2004 Searay 240 Sundeck. Yes, the serial number is for a 5.0 MPI, I upgraded the engine block and reflashed the ECM555.
I checked the oil pressure sensor wiring, my wiring diagram shows two wires (DK BLU/BLK and BLK/PNK) which are there, but there is also a GRY wire as well.
The sensor is a Mercruiser oil pressure sensor, part#881879-6
My understanding is the oil pressure switch is an on/off switch that supplies power back to the ECM555 and then the ECM applies power to the fuel pump relay.
The fuel pump will prime when the key is turned.
Any thoughts on why it appears the switch is operating backward or reversed?
Thanks
Joe
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