Odd TPS Error Behavior Montauk 150
Posted: Tue Jan 09, 2024 2:19 am
I have a 2006 Montauk 150, powered by Mercury 60-HP Bigfoot, serial 1B004506.
I had some electrical problems that were caused by the engine charging system. I had to replace the regulator, stator and the starter solenoid, and the intake manifold air temp sensor.
Engine runs fine on muffs or in neutral in the water. The following behavior only happens under way after I get up on plane:
After I had all of this done the engine started working better than it ever did, in terms of coming up on plane and running between 3000 to 4000-RPM, between 18 and 21-MPH. Any time the engine speed exceeds about 3900-RPM, the engine has an intermittent behavior where the engine cuts out for a second, a single BEEP Iis heard, and then the engine comes right back. It is almost like the key was turned to OFF and then back to ON.
On the engine tachometer gauge and on the VESSELVIEW display, after the engine cuts out, the engine speed drops to 0-RPM, then goes immediately back up [to a reading of normal RPM such as 4,000-RPM]. This seems entirely unlikely, since there is no way the actual engine rotation speed goes from 4000-RPM to 0-RPM and back [to 4,000-RPM] that quickly.
If I keep it around 3900 or 4000, it will cut out and beep randomly and then come back, and maybe run normally for another ten minutes before it will do it again, randomly.
If I go over 4000, to say 4300, the engine will start [cutting out] more frequently, and if I go WOT, it will do it repeatedly every three seconds. The engine display then indicates code 341-6, throttle position sensor error code.
I have already replaced the throttle position sensor (TPS), and that did not change the behavior at all.
The only other change I have made, since it was running fine before electrical problems occurred, was I added a trolling plate that also has stabilizer fins.
See https://a.co/d/fQbfWUx.
I had wondered if the trolling was causing problems with water uptake, but that isn’t the errors I am getting and I have.
Give me suggestions [for how to remedy the problem of the engining intermittently utting out.
Note that providing gasoline from a new tank and fuel line didn’t seem to change behavior.
I am kind of at a loss..
I have replaced the TPS, the intake air temp sensor, the manifold air pressure sensor.
I have purchased a used ECM to see if it could be that—it’s in the mail—but seems unlikely.
If I am ok going 18-MPH boat speed and no more than about 3800-RPM engine speed, this 21-year-old 2006 Mercury 60-HP BIGFOOT engine works great—but I’d really like to sort this out.
I had some electrical problems that were caused by the engine charging system. I had to replace the regulator, stator and the starter solenoid, and the intake manifold air temp sensor.
Engine runs fine on muffs or in neutral in the water. The following behavior only happens under way after I get up on plane:
After I had all of this done the engine started working better than it ever did, in terms of coming up on plane and running between 3000 to 4000-RPM, between 18 and 21-MPH. Any time the engine speed exceeds about 3900-RPM, the engine has an intermittent behavior where the engine cuts out for a second, a single BEEP Iis heard, and then the engine comes right back. It is almost like the key was turned to OFF and then back to ON.
On the engine tachometer gauge and on the VESSELVIEW display, after the engine cuts out, the engine speed drops to 0-RPM, then goes immediately back up [to a reading of normal RPM such as 4,000-RPM]. This seems entirely unlikely, since there is no way the actual engine rotation speed goes from 4000-RPM to 0-RPM and back [to 4,000-RPM] that quickly.
If I keep it around 3900 or 4000, it will cut out and beep randomly and then come back, and maybe run normally for another ten minutes before it will do it again, randomly.
If I go over 4000, to say 4300, the engine will start [cutting out] more frequently, and if I go WOT, it will do it repeatedly every three seconds. The engine display then indicates code 341-6, throttle position sensor error code.
I have already replaced the throttle position sensor (TPS), and that did not change the behavior at all.
The only other change I have made, since it was running fine before electrical problems occurred, was I added a trolling plate that also has stabilizer fins.
See https://a.co/d/fQbfWUx.
I had wondered if the trolling was causing problems with water uptake, but that isn’t the errors I am getting and I have.
Give me suggestions [for how to remedy the problem of the engining intermittently utting out.
Note that providing gasoline from a new tank and fuel line didn’t seem to change behavior.
I am kind of at a loss..
I have replaced the TPS, the intake air temp sensor, the manifold air pressure sensor.
I have purchased a used ECM to see if it could be that—it’s in the mail—but seems unlikely.
If I am ok going 18-MPH boat speed and no more than about 3800-RPM engine speed, this 21-year-old 2006 Mercury 60-HP BIGFOOT engine works great—but I’d really like to sort this out.