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1991 Johnson 115hp issues (hard start and idling under power)

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  • 1991 Johnson 115hp issues (hard start and idling under power)

    I wonder if some of you might be able to help me diagnose my problem. I just recently purchase a 17ft CC with a Johnson OMC 1991 115hp 2 stroke. Model number VJ115TLAIE. What I am experiencing is dificulty getting the motor started sometimes, and cutting out while idling, both in gear and out of gear. Here are the sysmptoms I see:

    This unit has VRO. Once I start up there is no issue while running at speed.


    When I come to rest and leave the motor in idle it will idle fine for awhile. 10-15 mins. Then I get an ocasianlay chuggin sound. The best way I can describe it is like the unit is huffing or sucking air. This will be followed by a stall if I do not increase my throttle up to around 1000rpm. Normal idle speed is about 700RPM


    When i turn off the engine after being run for 30 mins or so. If i have it off for any period longer than 5 mins I have to choke it to get it started

    I also am not able to just start it up in the netral position. I have to advance the throttle in netral to get it started, then let it run at 1500rpm for several mins before it will idle

    When i do the start procedure above I notice that there is alot more oil smoke than normal, but once idling the smoke level seems normal.



    I would think that after running at speed for 30 mins the engine should be warm enough to just start without choke, and without having to rev it for sevral min just to get it idling. Am I off base or do any of these symptoms point to things I can check/adjust to get this thing to start easier and maintain and idle?

  • #2
    Re: 1991 Johnson 115hp issues (hard start and idling under power)

    im having the same problem with my 1990 90hp vro. i was forsed to adjust the idle up to about 1100 in neutral in order for it to crank up with out bliping the throtel. let me know if you figer it out

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    • #3
      Re: 1991 Johnson 115hp issues (hard start and idling under power)

      frustrating isn't it? Especially if you are fishing, and have no trolling motor. Just want to idle on over 50-100 feet to reposition, but end up having to make all kinds of racket reving my engine to get it to the point were i can slowly shift position. Any help would be appreciated

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      • #4
        Re: 1991 Johnson 115hp issues (hard start and idling under power)

        Looks like a compression issue for me. all cylinders are 110 except cyliber #1 measuring 85 psi.

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        • #5
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          Re: 1991 Johnson 115hp issues (hard start and idling under power)

          Any other ideas, I am having the same problem, with the same motor

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