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I have a 1997 merc 150EFI saltwater. At any point in time regardless of rpm or temp the motor will stall. The motor will start right back up and you are on your way,it may run for an hour or 30 seconds before stalling again. I have changed the cdi,all 6 coils and the ecu. I have tested the trigger and the stator charges 13-15 volts depending on rpms. I changed all the fuel filters and checked the fuel lines for debris. i even ran it on an auxillary fuel tank just to take the boats tank out of the mix. I also checked all the plugs and harnesses for corrosion.

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  • Dan Aug 01, 2010

    thanks i will try that

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This engine has self test abilities,so when a problem occurs it can set a fault code in the EFI control modules memory, I suggest u have the dealer use a Merc scanner and see what codes are in memory, just guessing is costly and labor intensive,i believe you may have a problem related to the control module or the ignition system, each will set a fault code

Posted on Aug 01, 2010

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