2003 yamaha f115txrb surging

steplift20 · #1 08-28-2017, 05:27 PM

I am having an issue at low and mid range with surging. Top end she runs like a champ. Coming off of plane and low idle, she surges. I inspected spark plugs, coloration all the same no signs of lean mixture poured gas from water separator in glass bowl, no visual debri, checked oil level and coloration , looked good. traced a blue and yellow wire located under the throttle linkage under cowling to the fuse cover on engine. Upon removing fuse cover, a grey connector with a black jumper wire fell out. I know it fits on the diagnostic connector location ( this was the only one without anything installed ) and am not sure if I should connect it or should it be left out?
Could this be my issue?

steplift20 · #2 08-29-2017, 09:39 PM

Does anyone know of a website that I can go to look at the fuse panel on my 2003 Yamaha ? Thanks for any help in this matter,

spareparts · #3 08-30-2017, 06:05 AM

Id guess its a fuel issue. Take a good look at the fuel filter on the engine, I'm seeing them crack at the mounting stud on top. They start sucking air. Try priming the bulb and look for a leak on the fuel filter

steplift20 · #4 08-30-2017, 07:24 AM

Thanks spareparts I will do that I wanted to put up pics but I don't know how I thought I was doing it fight but it didn't go thru How do I get up pics ? Spareparts a grey connected with a black jumper wire fell out of the fuse box cover I know we're it goes but I'm not sure if I should connect it I don't know if it was supposed to be not connected just like a extra

spareparts · #5 08-30-2017, 06:03 PM

not sure about the black jumper, but the port for the scan tool has a grey cover, usually retained by a piece of clear monofilament

steplift20 · #6 08-30-2017, 07:21 PM

I would love to post pics , how do you do that,

SkunkBoat · #7 08-31-2017, 12:49 PM

Exploded views & part#s

http://www.boats.net/parts/search/Ya...XRB/parts.html

Have you tried spraying carb cleaner in the throttle bodies and air control valve?
see "Intake2" diagram, #10. Looks like maybe an air filter #13 on the control valve assy also...

steplift20 · #8 08-31-2017, 05:05 PM

No we didn't do that but we think it's the throttle positioning sensor If we put it in doesn't look to hard, I heard it has to be adjusted, does it ? and how do I do it

spareparts · #9 08-31-2017, 07:13 PM

leave the tps alone, if you dont have the software or a voltmeter dont mess with it. unless its idling odd, the tps is probably ok. there is a chance it could have a dead spot, but its hard to find,. You can try this trick, with the engine running and the cowl removed, tap on the computer with a screw diver handle, not real hard. See if it changes te way it runs. F115 computers are known to give issues.

steplift20 · #10 08-31-2017, 09:45 PM

It is idling odd, at mid range and low range like putting it on the trailer ,( high range is fine, ) but what your saying is I do need to adjust it the tps I will tap on the computer to see if it does change