2003 yamaha F115 TXRB issues

[Beedwacker_45]

I have a 2003 F115 TXRB that started cutting out or stalling when under load during the 1st 10 minutes of operation. It does it 2-3 times then is fine the rest of the day, great exceleration, top end, etc. After it happened the first time, I did notice a loose ground wire which I tightened and the wire to the oil pressure switch was slightly corroded so I cleaned that, too. I also noticed the IAC valve didn't always "click" so I took it out and cleaned as best I could. I fished the boat hard for about a month without any issues, then the last day of salmon season, it did it again. When I hook the engine up to the YDS program it gives me a shift position switch code error (which it's done everytime I've had it cut out), but I doubt that is going to cause the engine to quit. However, I'm wondering if the ECU is having issues in combination with the IAC sticking???
I should mention that I have had fuel related issues and cleaned the entire fuel system and replaced the VST filter, clean the injectors. I did not replace the fuel pump yet. The engine has about 1630 hours.

[rodbolt17]

a sticking isc valve can and will take out an ecu.
there are no codes associated with the isc.

[Beedwacker_45]

Ok. The random nature of the issue makes it difficult to track down the culprit. In the mean time, I guess I'll just try to eliminate any other possibilities from the equation. I can replace the ISC valve easily enough, though they're a bit pricey for tiny little part...

[99yam40]

You might get some info on F115 s out of this thread.
Hope he did not sell you his motor

http://www.yamahaoutboardparts.com/f...e-th15590.html

[Beedwacker_45]

Nope. Different engine. I've been the owner since 2003. Thanks for the link though.

[rodbolt17]

need an altenator?
I looked at that link.
I seriously need a life.
shift position switch codes are typically set when the ECU detects RPM or tthrottle positions its not mapped for.
however it wont affect running on that motor.

[99yam40]

Rod You just need to keep lubricated well ( hope it is not the hard stuff , just Bud lite) and go with the flow. Usually it takes about 10 to 12 to really get going

[Beedwacker_45]

I did find that my main positive battery cable is showing signs of corrosion so I'll replace that. Rodboldt are you referring to the Stator when you say alternator? I have not checked the stator yet.
Thanks for your input.

[rodbolt17]

altenator thing is a joke.
sometimes you can soak the ISC in combustion chamber cleaner.
dont submerge it.

[Beedwacker_45]

On a slightly different thread, I heard yamaha made quite a few changes to their 115 fuel system. I wonder what they did to rectify the issues they were having on the earlier models?

[rodbolt17]

there were no problems with the multi shutter design that we wont have with the single shutter.
nasty gas is nasty gas.
thank god,and a foolish govt, for E fuels.
E fuels are the us govt marine tech stimulous.