2004 225 DI stalls, tach then shoots up

[Got Twins]

E225FPXSRB
05036690
Engine stalls out at idle or when running higher RPMS. Just cuts out, and the tach then goes all the way to 7,000 and back to 0. Engine starts right back up afterward. I’ve swapped EMM’s, PDP, solenoid to isolate issue and issue stayed on engine (did not follow to other engine with any swap which I did one at a time). When I turn the ignition on the main power relay which is located directly port side of EMM makes a intermittent buzzing sound which sounds very similar to the fuel pump sound. Sometimes it buzzes continuously other times intermittent. I changed relay and still occurred. What would make that relay buzz and could it be relayed to the stall? Stall seems electrical because the engine cuts out swiftly and tach does its dance.

[JoePA]

Battery terminals have wing nuts on them? Sound like an intermittent open. Something is loose somewhere.

[Got Twins]

Battery terminals are nylons and were taken apart and cleaned/wire wheeled 2 weeks ago. Problem developed a few weeks before that and continued after the battery maintenance. Maybe the battery switch?

[Got Twins]

FYI I also switched the ignitions to isolate issue but it stayed with the engine still. Didn’t jump to other motor.

[ChampioNman]

Going from bad to worse huh? Have you tested the stator?

[Got Twins]

I haven’t. I’ll read the manual now and see how to do that.

[Got Twins]

Ok Champ seems easy enough to do. I’ll try to get that done this evening. Thanks

[Got Twins]

I disconnected the 8 and 12 prong connections from EMM and tried to check but I couldn’t get a reading on the meter from anything. Directions are pretty simple in book about which pins to check together but ohm meter didn’t read correctly. I’ll get somebody who knows what they are doing with electricity that’s my weakness. Probably easier for me to swap stators lol.

[Got Twins]

Just an update. I had a spare engine I blew on rod on 2 years ago so I swapped the TPS, capacitor and stator. Ran engine for an hour with no issues. Since it was an intermittent issue (that would happen every time out) I’ll have to see how it goes.