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tswanson.
it runs great at WOT, and all mid range RPM, it even idles great, will even idle while in gear when when I start to give it some gas it will die, after a few attempts it will come out of the hole like nothing is wrong, carbs were rebuilt june of 09. any ideas?
ok an update on it, i noticed a leak somewhere around the VRO that will travel down and leak out onto the motor toter after it sits a while, i cleaned the area but I cannot find the leak now, is it possible the VRO is stuck on me it smokes pretty good on startup? I cant say it is bad gas anymore due to the fact that it will run just fine at all other rpms and I checked the fuel filter and it is relativly clean.
Sounds like a fuel pump or fuel line degradation. The lines and pump will collapse or give trouble when they have issues. On these older OMC engines they also would have similar issues on the gasket degradation at the reed petal plates from ethanol.
Does the VRO alarm sound if you idle for a long time? Sounds to me like you are sucking air. Dont drive hard until you find out what is going on.
Sounds like the motor is thirsty for fuel. We saw a motor with this problem yesterday and found the fuel lines were showing signs of degradation. Id start there.Andy GreeneGreene Boat & MotorAndy Greene Greene Boat & Motor 828-286-2290 http://www.greeneboats.com
no alarms but I think bcb and greenboat may be on the right track…. the fuel filter was relativley clean except for a little bit of black in the end of it it didnt look to serious cause there wasnt alot of it, i figured i would replace the filter anyway. I didnt put 2 and 2 together until I seen the fuel line degredation, but I think i will replace lines and start there….. I dont think i have much to worry about on running it since i know it is getting plenty of oil no alarms and runs good, compression is good across the board, it just started saturday and dies during the transistion between idling in gear and giving throttle to get out of the hole
Fuel lines get hard and crack or loose seal at the barb fitting. If you replace yourself make sure you use the correct type of tie wraps. They have a curved base and are special for fuel hoses. If you are opening the carbs and the engine is dying it is because the motor is not getting enough fuel. I would also try cleaning with Mercury Power tune after you replace the fuel hoses. You can do a simple test by holding your hand and partially restricting air flow to the carbs (choking it).If you find that the hesitation goes away by restricing air you can find your troubled carb/ carbs. I do this to help establish hi speed jetting on modified engines.Not related but keep an eye on where the VRO hose attaches to the oil tank. Over time an air leak will develop from the hoses getting pushed around. At low idle the VRO alarm will go off. At higher RPMs there is enough pressure for the VRO system to build enough pull but make no mistake that oil mixture is not what it should be. Make sure it gets fixed or you will torch your motor.
btilley, im having this same exact problem with mine right now. exept that it has never done it first thing right off the trailer. its after i run it, fish for a few hours then crank it again. if i idle a while then go to take off i will have an alarm sound. like the over heat alarm. ill kill it then turn key back on and itll be fine. id sure like to know what the problem is if you figure yours out because i dang sure cant figure mine. by the way, looking at your avatar btilley, it looks as though we have the same exact boat and motor, color and all.
dedwards, mine wasnt doing it right off the trailer either but I never had an alarm (possibly you are sucking air from somewhere), what i did was replaced the fuel lines to the fuel filter and the fuel filter, i had about a half a tank of fuel so I filled it with non-ethenol fuel, and ran some quickleen in this tank. I was also told by an OMC mechanic that it is pointless to run over 87 octane in these motors, and it can actually have an adverse affect due to the additives that is put in the higher grade fuel. I took the fuel filter out and held it down in a mason jar and pumped the bulb a couple of times and you could see the black “soot” trying to get pushed through. I am an ASE certified (automobile) mechanic and working on these is a whole new ball park for me, so i am trying to learn little by little. If you need any help let me know. Send me some pics of that boat if you get a chance tilley4u2nv2@gmail.com
Hi octane gas burns slower and is designed not to explode when using hi compression engines. If the engine dont knock (i.e. a low compression engine) you will almost always have better performance using low octane gas. Some V-Ws have such low compression engines they will not run on premium fuel. The cylinder pressure does not generate enough heat to properly ignite the fuel.Summary: Octane rating should match cylinder pressure. Premium is not always best.
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