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Looking for information. I have a 2000 Yamaha F115 that seems to be misfiring. All tests were done on the muffs. It will crank every time but will die as soon as the IAC/ECM brings the idle down. If I bump it up to about 1800 RPM before it dies it will run, but it is rough.
Good spark on all 4 cylinders - tested with inline checker
All new fuel lines, filters, and injectors. Fuel pressure at schrader on the rail is a steady 40 PSI
All injectors click at key turn. They all have 12.24vdc to the injector harness plugs while running. If I disconnect the injector 1 & 2 harness lead (separately) the engine stumbles or dies immediately. When Injector leads 3 or 4 are removed there is no change. I thought that I may have had a smoked ECM (even though it is rare) so I swapped it with the other F115 on the boat with no change.
I pulled the pulse coil and did a continuity check by passing a piece of metal in front of the magnet and it seemed to work as designed.
Looking for and thoughts or suggestions. Thanks in advance for any and all help.
Good spark on all 4 cylinders - tested with inline checker
All new fuel lines, filters, and injectors. Fuel pressure at schrader on the rail is a steady 40 PSI
All injectors click at key turn. They all have 12.24vdc to the injector harness plugs while running. If I disconnect the injector 1 & 2 harness lead (separately) the engine stumbles or dies immediately. When Injector leads 3 or 4 are removed there is no change. I thought that I may have had a smoked ECM (even though it is rare) so I swapped it with the other F115 on the boat with no change.
I pulled the pulse coil and did a continuity check by passing a piece of metal in front of the magnet and it seemed to work as designed.
Looking for and thoughts or suggestions. Thanks in advance for any and all help.