boat motor question

i have a 93 evinrude 150 v6. it runs great on plane, about 25mph is all i need to go. will easily go faster no problem no smoke but if go slower especially around 3 to 5 mph. it will make a sneezing type sound and die. it will continue to do this over and over. i have to continually restart it and man does it smoke. it smokes at these lower speeds even when it is warmed up. and man does it use a lot of oil. i do not put the oil in the gas manually. it is done with the oil reservoir. i will really play close attention next time i take the boat out and see how much oil i use per # of miles. use of gas is fine. but for sure it uses a lot of oil and smokes a lot but not a higher speeds, and at higher speeds it runs great. does anyone have any thoughts how to help this problem?

Stuck float?

is the float in the oil reservoir?

You may want to check your oil reservoir cap to see if it's sealing so that you get the correct amount of pressure.. it does sound like you are getting a ton of oil in the mix at low rpm

my 85 Johnson motor smokes a bit at low rpm ...pre mixed fuel
my buds said its cause its old
i do know she is a bit ruff on the idle when she is cold
but after a second or 3 ....she idles like a sewing machine and then ....
go lil zebras go ....
btw ,,,,they disconnected my oil injection system after it burned up the motor before i got her
the thing that comes to mind with me ....if it puts to much oil in NO biggeeee
if it puts NOT enough ....BIG problem
i would watch that thing like a hawk there sir ....

Im with Ketchn .... I would block off the oil injection and pre-mix it. Will probobly solve your problem and give you peace of mind!

sounds like your vro pump is having proplems. you can put it in the shop and who knows what they will charge. you probley need a new pump ect, I think i would disconect it and start premixing 50:1 oil with gas. the disconect is pretty simple a couple plugs to undo and cap oil lines you should be ok then. Shadrap youu need to talk to your neighbor!!

if you will put a new set of plugs in it that will fix your idleing and low speed dieing.

Sounds like I have about the same problem on my 94 Merc 115. It dies sometimes at low idle, and a lot of times when you put it in gear. I was thinking maybe I needed a carb job. I have recently put new plugs and a fuel filter in. I know the oil reservoir doesn't seal on top, it you fill it and trim the motor up, it spills. Do you think disconnecting the oil and pre-mixing would fix it?

I did that with mine about 5 years ago. I have an Evinrude 94 model 150hp.

Seems like the vro pump was $300.00 so I just blocked it off & premix my gas.

They smoke at low speeds because pre mix ratios are intended for WOT. Sounds like carb jobs may be in order.