'93 Johnson 150 stalling problem

[dbharrison]

Hello everyone.

I have a '93 Johnson Tracker "Nitro" 150 model TJ150GLETG on a '93 19 ft Pro Line Sportsman.

The last couple of times I've had it in the water, it has stalled when I give
it throttle of more than "barely above idle". I can not get it to clear itself
to see if it will run at WOT. When it stalls, I can prime the bulb and restart
and it runs ok again. Primer bulb will pump tight in 2-3 pumps but goes
very soft as soon as I begin to run it again. I have to idle through a long
channel to get out of the marina to the bay via a no-wake zone and it will
get out there ok. Once it stalls, it doesn't even want to idle smoothly
unless I repump the bulb. To get it back through the no-wake zone to the dock, I have to repeatedly repump the bulb just to keep it at an idle. I have read several posts that offer advice to try using the choke button on the key to keep it running instead of the primer bulb but unfortunately, I didn't think to try to that when I was on the water. Also, it seems to have a lot more white smoke than it used to or should, even after it is warmed up. It starts and runs fine on the trailer using the Mickey Mouse ears, but that is only at idle under no load. I have checked all of the hoses, connections, fuel filters, and replaced primer bulb. I have a pressure gauge that I am going to test the pump with. After reading other postings, I am also going to check the anti-siphon valve which I'm assuming is in the pick-up stem inside the tank?

Here is the root of my question: My brother was conducting routine service and filling the fluids and accidentally bought a quart of 4-stroke oil instead of 2-stroke and put it in the reservior along with some 2-stroke oil. The ratio that went in the tank was 1:3. When I noticed the empty container the next day, I drained the tank and lines and replaced it all with 2-stroke and all seems well now. I did not notice any problems with performance that day. Is it possible that the mix of 4-stroke and 2-stroke could have damaged by VRO pump on the fuel side which is now causing my stalling problems? What other side-effects and problems would that have caused?

I went ahead and ordered a new VRO pump to see if that is the problem.

Any thoughts are appreciated.

Thanks,
Boone

 

[clemsonfor]

Re: '93 Johnson 150 stalling problem

Sounds like the fuel pump side is not pumpung adequatly, to allow the motor to run above idle or even at idle sometimes. As for the oil, there was enough 2 stroke in there and it is still oil, not the first choice but back in the day they used 30 wt, but the motors were not as sensitive to oil as they are today. But, i am no expert but i would say good thing you caught the oil thing but that probly did no damage.

-Nate

 

[dbharrison]

Re: '93 Johnson 150 stalling problem

Thanks for the reply.

I received my new VRO pump yesterday. I ordered P/N 5004558 (use on all VRO2 engines except 2-cylinder) but I received P/N 5007420. I can't find any application guidelines for 5007420 but wonder if it has replaced the 5004558 and 5004559 (Fuel only) pumps. The one I got says the appliation is for both VRO2 fuel/oil and fuel-only.

Any thoughts?

Thanks and Semper Fi!
Boone
(CWO3 USMC)

 

[clemsonfor]

Re: '93 Johnson 150 stalling problem

Can't comment as i don't know anything about the operation of vro systems!

-nate

 

[dbharrison]

Re: '93 Johnson 150 stalling problem

Just to follow-up for anyone who comes across the thread with similiar symptoms.

I installed the new VRO pump and my motor not only accelerates without hesitation and does not stall, but it also idles more smoothly (didn't notice it idling rough before, but it is noticable now) and it also seems to have a much smoother and more responsive throttle.

Also, VRO #5004558 (use on all VRO pumps except 2-cylinder) has been replaced by #5007420. Removal and installation was a snap but I had to rely on my SELOC manual because the instructions provided with the pump were very bad. The instructions that came with the pump even stated that the user should follow the instructions provided in the repair/service manual.

Semper Fi,
Boone