DF140 rough running after sitting a few weeks in covered storage

[malyea]

I have a 2004/2005 Suzuki 140 in Johnson clothing. It starts fine after sitting a couple of weeks, but runs rough and has Check Engine light (for about 30 seconds) and won't accelerate past 3000 rpm. After about 20 minutes, starts to run better, after 30 runs great. The next few days, starts and runs fine.

Filters clean, water separator okay. Changed plugs. Changed to alternative tank and line. Seems like once it warms up that first time after sitting a while, it dries everything out and then is fine? Where is the most likely place to look in ignition system for moisture effects?

Could this be low battery voltage causing this kind of problem?

Suspecting corrosion in connectors? All fresh water use and ethanol free fuel.

[artdf175]

malyea Has anyone responded to your help request?

The 3,000 rev limiter is not fuel or battery related
I don't have a manual in front of me but there are several sensor situations that can cause the rev limiter to activate..
could be a faulty sensor in that once the engine warms up. the sensor starts working and clears the problem
it is sounding any of the alarm beeps when in the alarm mode?
Art

[Solarman]

It could be low battery voltage.
And yes it could be moisture from humidity affecting something like the neutral/shift switch (this does limit motor to about 3k RPMs, thinking it's still in neutral). And, yes this switch would cause it to run rough.

Probably the only way to know, would be to read the codes from diagnostics.

I guess boats just don't like to be in storage for extended periods of time. Lol

Good luck.