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2000 Johnson Ocean Pro 150 Problems

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veroslayin

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Alright guys here goes nothing... Within the past year I had purchased a 21ft bay boat with a 2000 Johnson 150 Ocean Pro on the back but have been having some trouble with it. My problem here is that it will start and run fine but then randomly will start to run extremely rough at idle and start shaking very badly. When this happens it is usually at idle speed and sounds as if its going to die at any second. When taking it out of neutral the rpms will jump around and raise up to about 1500 while still running rough. Shutting off and trying to restart engine only makes its run extremely rough and then eventually just shutting back off after a few seconds. After messing with the engine for awhile and starting it a bunch of times it will eventually after maybe 15 minutes idle down again and begin to run smooth again.... Im completely stumped, any suggestions? It really likes todo it sometimes when the engine has been shut off at fishing spots and has sat for a little, the random rough high idling also really confuses me??
 
Would quikstart make it idle that high? I can see the rough idle when first started and then it drops down to around 600 rpm, but would it be accidently switching back? The t stats were also changed a few months ago
Thanks!
 
Quikstart is engaged every time engine is started....either thru temp to low or constant 12v on yell/red wire on solenoid..
 
Okay! I will look into it. How would I go about checking the quikstart feature? I know its engaged when the engine is cold as it runs a little rough for a minute or two and then settles down, but would it cause the rpms to surge to about 1500 while on the water? I notice that when this happens there is also a decent amount of smoke coming out of the back as it maybe to much oil or flooded. The vro is disconnected
Thanks again
 
IF you think the problem is due to a fuel supply issue, then maybe it could be vapor separator related.
But I think that is unlikely.

If you recall, the idle speed is directly controlled by the idle timing. So, anything that affects timing is suspect. That's something QS does, powerpack, and the optical sensor.

If it were me, at this point, I would just skip straight to replacing the optical sensor. I usually never recommend shotgunning a component, but the optical sensor is best and easiest tested
by just swapping in a new one.

It is on the throttle linkage page of the parts diagram. Costs about 80 bucks. Ref #24, PN 586343.
 
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