Yamaha F115 ?

[reddog]

Earlier this spring, I had a problem with my F115 that hasnt been able to be resolved to date, and would like to know what some of your ideas are as to what it could be.

I fish alot of winter and early spring reservoirs. ( I think I have about 120 hours on my motor for 09 already.

Anyway, Back in late march, I was running back to the ramp and a warning buzzer came on at my tach, which also has an oil pressure and a water temp signal lite, neither of which was showing any indications of a problem. The motor went into limp mode and I limped on in to the ramp.

It baffled me that neither warning lite indicated what the problem was, but I assumed that it was the water pump, because of all the times I had started the motor on the trailer ( just a few seconds) after getting done fishing to clear the unit of any water that may freeze in the unit. I had planned on changing the water pump anyway, just for maintainance, as the motor had 260 hours on it at the time.

I took it to the local dealer, who has a tremedous mechanic, They ran a scan with the computer, and it showed no codes or faults.

I had the oil , gear lube and water pump changed, since it was already in the shop.


Next day out, same thing, running down the lake, and the warning lite started "chirping" and then turned into a full blown buzzer and the motor went into limp mode, (no lites on the guages lit up) so I headed back to the ramp and back to the mechanic. He hooked it up to the computer, and it showed nothing thru all the menus. We then put it on the water and ran it for 15 minutes with the computer hooked up, looking for something. Everything checked out good and I used it the rest of the day with no problems.

This last weekend, I put the boat on the water, and the same thing happened. IT seemed to happen consitently when the motor was cold, but not until I was a mile or so from the ramp. If I trolled with it for an hour or so, then I could run, but from a cold start, it would kick it back into limp mode a mileor two downstream. Never has either of the lights in the guage turned on, with the exception of when I start it, so Im pretty sure they are working.



Anybody have any ideas what to look for , if the computer doesnt say anything is wrong?

I fully trust the mechanic, just looking for someone elses ideas.
TIA,

R

[Hot Runr Guy]

Have they checked the water/fuel seperator under the cowl? If the sensor detects enough water, it also sends an alarm out.
HRG

[reddog]

I had checked that, and it is my understanding that if the red float is at the bottom, then there is no water in the separator. is that correct?

[Hot Runr Guy]

Originally Posted by reddog

I had checked that, and it is my understanding that if the red float is at the bottom, then there is no water in the separator. is that correct?

Sorry, I'm not smart enough to answer that question. I was looking thru the owners manual for your motor, and saw the water seperator had an alarm function. So, I thought I'd throw it out for discussion.
HRG

I've had my 115 go off a couple of times. Mostly when I'm starting it up in cold water & once when I went through thick weeds & had a mess on my prop. The float should be at the bottom

[big_crappie]

Yamaha did have a little trouble with a few of those water sensing filter assembly's. They would sound an alarm even when no water was present. Usually we saw it on the 150's and 250's. If that sensor is faulty or senses water it will sound an alarm but will not put the motor in limp mode. Have your mechanic call Yamaha Tech line for help.

[reddog]

Thanks guys for the info. Ill see what the tech says when he gets into it this week. The boats at the lake home,. 3 hours away. I just thought Id throw it out here for some ideas.

R

[crosbystick]

[QUOTE=reddog;1102700]Thanks guys for the info. Ill see what the tech says when he gets into it this week. The boats at the lake home,. 3 hours away. I just thought Id throw it out here for some ideas.

R[/QUOTE}
Next time u have the alarm take cowling off and un-plug the wire that comes out of the fuel bowl if it quits its the sensor we have had a few go bad !!

[reddog]

Big Crappie, Well, whatever is causing the warning buzzer, does put the motor into limp mode, so thats probably not it


CrosbyFish, would a water sensor warning throw a code that would show up in the computer diagnostics ?

[reddog]

How would you get a proper diagnosis, if the warning buzzer doesnt throw a code into the computer and the motor wont do it with the tech in the boat, but only when Im running it. The mechanic has had the boat on the water at least 3 times,( once with me along, but not running the motor) and cannot make it happen, but yet it happens with me almost everytime.