keokie
Well-Known Member
- Dec 27, 2006
- 1,465
- Boat Info
- 2002 310 Sundancer, Westerbeke 4.5 Genset
- Engines
- 496's, Bravo III's, 2.2:1 Gears
I saw that but I don't believe it. Literally the injectors are not being told to increase duration when every other sensor is telling the ECM to do that exact thing. Even if it was a timing chain issue or an exhaust issue.....the ECM would advance the injector duration. What other sane explanation is there? At almost exactly 2000 rpm the ECM stops the injectors from advancing which is why there is no rpm increase. Revving in neutral is not same thing since the injector ON duration never gets close to 6ms.
What I am suggesting is that with all the work you have done....one or more of the "discreet" sensors were disconnected. I don't doubt your oil pressure is fine.....but if there is a sensor that is disconnected nearby.....that would explain it.
As to why the Fox Marine unit would not pick it up that is more about how they would see it. The way most of these systems work is to convert voltages into measurements. The list of discreet sensors that they report on (two) do not include all the ones (six) on the list and the MEFI-1 is from 1996 which was 27 years ago. So I do question how they would know if a discreet sensor was unplugged when the manual calls for ohm testing every discreet sensor.
At some point....you have to look at the data ask yourself what scenarios actually fit the problem. To me....only the ECM controls the injectors and there is a direct correlation between Injector On duration and if the engine will spin up.
If you doubt it....find another engine that is working and hook your Fox Marine Unit up to it. What you will see is under load the injector On duration will increase smoothly up to 4000 rpm probably reaching 12-13ms of duration.
As to below 2000 rpm....the Safe mode was designed to operate completely normally below 2000 rpm which it appears to be doing perfectly.
Just my thoughts.
I'm with you on this. If it were mine, I would definitely go deep down this rabbit hole. I'm betting there is a rabbit at the bottom of this one.