I just bought a low hour 2007 MD50 for my inflatable. during my 2nd run around the lake while canal cruising she just stalled.
I noticed all three light blinking and she was hard to start, but when I twisted the throttle wide open she did fire.. I thought it might be the plugs loaded up so I limped out toward my house with the intention of "clearing the engine out with a wide open throttle pass".. But the motor seemed like it was in a guardian mode and would not allow much more than idle speed.
So when I got home I pulled the boat out, hooked up some ear-muff and started her.. once again very hard to start and once started she revved very high and would not come down. (Turned off)
- I replaced the fuel with fresh gas (same)
- I checked the fuel lines for damage, collapsing or a vapor lock (still the same)
- I pulled the fuel filter, cleaned and replaced (same)
- I check for air in the fuel system from the Schroeder (sp?) valve (same)
I also checked the battery connection thinking that might mess with the TPS and found i was able to move the negative cable with a stiff push.. so I cleaned it and re-attached. (The lights are off now, but the same high idle with a difficulty to start problem is still with me).
also notice if I disconnect the TPS while she’s running the idle drops to normal, but I'm unable to rev the engine and it feels like it’s in a guardian mode again.
The owner’s manual does not have much information and I most likely going to order a service manual today, but would anyone have a "check this" list I can do before the manual arrives?
Thanks
I noticed all three light blinking and she was hard to start, but when I twisted the throttle wide open she did fire.. I thought it might be the plugs loaded up so I limped out toward my house with the intention of "clearing the engine out with a wide open throttle pass".. But the motor seemed like it was in a guardian mode and would not allow much more than idle speed.
So when I got home I pulled the boat out, hooked up some ear-muff and started her.. once again very hard to start and once started she revved very high and would not come down. (Turned off)
- I replaced the fuel with fresh gas (same)
- I checked the fuel lines for damage, collapsing or a vapor lock (still the same)
- I pulled the fuel filter, cleaned and replaced (same)
- I check for air in the fuel system from the Schroeder (sp?) valve (same)
I also checked the battery connection thinking that might mess with the TPS and found i was able to move the negative cable with a stiff push.. so I cleaned it and re-attached. (The lights are off now, but the same high idle with a difficulty to start problem is still with me).
also notice if I disconnect the TPS while she’s running the idle drops to normal, but I'm unable to rev the engine and it feels like it’s in a guardian mode again.
The owner’s manual does not have much information and I most likely going to order a service manual today, but would anyone have a "check this" list I can do before the manual arrives?
Thanks
Last edited: