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    Boat sputtering at full throttle

    1997
  2. E

    Boat sputtering at full throttle

    Hello! Last year I purchased my brothers Mod V Jon boat with a 35 hp Johnson. We went to take it out and shortly after getting it in the water we went to open it up. After a couple mins the motor ended up cutting power and when trying to accelerate again, it almost sounded like a car engine...
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    89 4.3 OMC cobra stalling at WOT

    Yea this is what I’m working with, thinking this is going to have to get replaced sooner than later
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    89 4.3 OMC cobra stalling at WOT

    Yep I kinda figured so I just got an entire new impeller kit with the housing and gaskets and everything and as for the rust in the manifold, yes there are chunks flaking off if your looking into the intake manifold, I’ll grab a picture of it today and put it on here when I head over that way.
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    89 4.3 OMC cobra stalling at WOT

    Alright, thanks for everyone’s patience. Finally got to the thermostat and everything on the boat. Looks like the metal lining that in around the impeller spun and shaved the fins of the impeller.. so that’s option 1 that will be replaced. Option 2.. the thermostat looks like it hasn’t been...
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    89 4.3 OMC cobra stalling at WOT

    Alright so I got home late last night so I didn’t get a chance to take a look at the thermostat or anything but I got the muffs on it and it seems to have good water flow being exhausted through that hole. How can I tell if the thermostats bad?
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    89 4.3 OMC cobra stalling at WOT

    Also to add, the impeller was replaced last year, is it possible that it’s bad already?
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    89 4.3 OMC cobra stalling at WOT

    Okay I will hook it up tonight and look at what I can see, and 220 was a guess comparing The temp gauge to a 4.3 chevy v6 motor in a vehicle. I don’t have any numbers on my temp gauge But it sits above the temp symbol I’d say about 3/4 to the top, if that makes sense.
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    89 4.3 OMC cobra stalling at WOT

    The distributor looks like it has had new points in it at one point, doesn’t hurt to switch them out though, and as far as I can tell, it doesn’t run hot, can’t give you an exact number of where it’s at but I’d say around 220°? You think I could have an internal leak somewhere where the water...
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    89 4.3 OMC cobra stalling at WOT

    hello all, A few months ago I bought a 1989 4.3L OMC cobra. First time I took it out, it ran great for the first lap, second lap it started misfiring, third lap, it stalled out and shut off, keep in mind this was all at WOT. idling was fine. after it shut off it was a pretty hard start for it...
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