2011 Yamaha f150txr intermittent fault

[Chantres83]

Hello good evening I have a 2011 yamaha f150txr with 800h regular maintenance 200psi compression on all cylinders, the problem I have is the following, for about a year it has an intermittent fault sometimes it works well and accelerates at more than 5000rpm for several hours, but many times I can't go above 2000rpm, once it goes over 2000rpm the engine starts to fail as if it stopped working several cylinders, it doesn't matter if I accelerate to 3500 or 2500 all at once it always fails after a couple of seconds I lower it to 2000 and it works again Again, to get out of the failure what I do is lower the accelerator and raise it again, this I have to repeat it many times until it fails again and I can continue on my way, it is really frustrating, what I have done to him check the fuel tank all right I use gasoline without ethanol change of all filters including cleaning and replacement of VST filters change of injectors change of coils and spark plugs change of TPS sensor visual check of wiring harness all good There are no alarms or codes in the ECM fuel pressure good even with the failure, for me it is an electrical problem but I still cannot find what it is, and I have seen 3 mechanics and none have given the problem I hope they can help me since the I'm really frustrated with this

 

[Chantres83]

View attachment IMG_1756.MOV

 

[Chantres83]

View attachment IMG_1816.MOV

 

[Faztbullet]

Check the shift switch..

 

[Chantres83]

Check the shift switch..

I checked it and it's good like the neutral switch I took out both and tested them out of the engine, that fault has me confused, it's as if it went into limp mode but there are no alarms or codes

 

[99yam40]

has any of the techs hooked up a computer to this motor to monitor what is happening when the problem is happening?

 

[Chantres83]

I checked it and it's good like the neutral switch I took out both and tested them out of the engine, that fault has me confused, it's as if it went into limp mode but there are no alarms or codes

At the time of the failure with the computer connected, all the correct parameters, in fact in the video that came up with the failure, the computer is connected and a pressure gauge to check the fuel pressure, everything is good, the truth is driving me and the others crazy. Mechanics that I have seen

 

[Chantres83]

I have already spent a lot of time and money and I have not been able to solve the fault and changed many things without any change, I only have to change the oil sensor, the 2 temperature sensors, the sensor coil under the coil and the ECU but I do not want to spend more money changing pieces that at the end of the day were replaced for pleasure

 

[99yam40]

I have already spent a lot of time and money and I have not been able to solve the fault and changed many things without any change, I only have to change the oil sensor, the 2 temperature sensors, the sensor coil under the coil and the ECU but I do not want to spend more money changing pieces that at the end of the day were replaced for pleasure

what is the sensor coil under the coil?

If you have monitored oil and temp and other things and they did not show a problem when this happens, I would not think they are the problem.

I would think you are loosing spark or fuel to some cylinders or maybe both.
need to find a way to monitor those.

a timing light hooked to the different plug wires should show if spark is a problem

 

[Chantres83]

what is the sensor coil under the coil?

If you have monitored oil and temp and other things and they did not show a problem when this happens, I would not think they are the problem.

I would think you are loosing spark or fuel to some cylinders or maybe both.
need to find a way to monitor those.

a timing light hooked to the different plug wires should show if spark is a problem

under the rotor there is a sensor that controls the coils but I don't think that is the problem since when that fails the computer modifies the ignition time automatically and the engine would be accelerated around 900rpm in ilde, the first thing I did was change the I changed the spark plugs 2 times hoping that there was a bad batch, I also changed the coils, the cables I did not change if I provided them and they are within the manufacturer's specifications

 

[Chantres83]

under the rotor there is a sensor that controls the coils but I don't think that is the problem since when that fails the computer modifies the ignition time automatically and the engine would be accelerated around 900rpm in ilde, the first thing I did was change the I changed the spark plugs 2 times hoping that there was a bad batch, I also changed the coils, the cables I did not change if I provided them and they are within the manufacturer's specifications

https://www.boats.net/catalog/yamaha/outboard-by-year/2006-and-later/150hp/f150txr-0411/generator

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