JoshMundy
Member
All my connections are good. I went through when this first happened, checked all connections and added dielectric grease.2daMax said:Sounds like an intermittent issues with Idling condition (off throttle) and I am also assuming that when you pull in the clutch, the throttle is also off.
Brain storming.
The YCCT system controls the throttle valves, opening it at certain angle to let in the right amount of air which the also release the right amount of fuel. ECU looks at MAP sensor vacuum readings, intake temperature, Throttle position sensor and determines the amount of fuel to release, and checks the O2 sensor if it did the right amount, under Close Loop conditions.
Areas I think the problem would occur are:
1. TPS sensor or its connectors and wiring associated to it. The service guide shows how to check it. Located at the throttle bodies. Most likely source as this thing tells the servo motor how much to turn.
2. MAP sensor, or its connectors or wiring associated to it.
3. Servo Motor that drives the throttle plates but it being the fault is rare as it works when the throttle are turned.
4. Mechanical linkages that open and closes these throttle plates, are they loose, too much play, too tight...
Check item 1, maybe it is the wiring that tells the ECU the wrong information. There is a post on making the bike respond better by adjusting it.
Lastly, is your throttle plates gummy with oily residue. Would not harm to use Carb cleaning fluid to clean the plates and the surrounding throttle areas. This is sticky stuff and sticky makes things inconsistent.
Havent checked the linkages as the throttle feels correct and responds as id expect. It is just the times it does it, it happens and then will be fine for a while.
Ya im not sure what I will do, but probably get it back into the dealership. I just dont want to deal with them saying it needs the new ecu, as I highly doubt it is that but I have a feeling they will say if I refuse the ecu replacement then they have no other ideas as with the error codes it was throwing the book says replace ecu.Ramseybella said:JoshMundy::: You just described exactly how my bike starting it's long journey of giving me misery for two or more years..
Intermittent stalls had to WAT from time to time to get it to fire up and feather the throttle to keep it running.
Then ran fine for a month or two then start's it crap again..
Nearly a year of High, low and stall bouncing RPM's at a light, i was about to push it off a cliff and clam it stolen at one point.
As i have been saying all along Yamaha knows much of whats going on just not recalling them.
Wiring harness so far has 99% fixed it, it does do the 900 RPM drop once in awhile but never stalled no more raw fuel parked in the garage smell.
And still pulling like a Mule with off the line Cheetah legs. CROSS THE FINGERS?
This is a different problem. Our bikes are not stalling and stumbling, they just are dying once there is zero throttle input and clutch is pulled in. I can be doing 70 on freeway, let off throttle and pull in clutch, tach drops to zero.jjc1957 said:I own a 2015 non-es and it stalls at least once per tank of gas. Reading and working on a fix now. First time I have had a fuel problem on a Yamaha. I was out the other day with a BMW GS and a V-strom well the light turned green and everyone took off but me. They still won't leave it a lone.