88 OMC cobra v8 cuts out at HIGH RPM

[vonway]

i have a four winns with a 88 Omc I.O. and have been running since May launch - everything ok.. now yesterday, noticed a couple times, while running across the water, if i were half throttle and went to WOT the engine would seem to cut out or miss slightly, and as soon as i lower the rpm it would run smooth again. At idle it was fine? what would this be? This past winter i had a complete tune up (plugs cap rotor, points (timing dwell set) ??? Fuel or electrical?? THANKS

 

[bigdaddyofhouse]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

How is your alternator? Mine went bad this past week,and so did top end.after replacing my alternator all is well.So Its worth a look at your voltage, make sure that your reading at least 13 volts while under way.<br /> I realy thought I had two problems because she would fire right up and all electronics worked fine,inclouding tilt-trim.<br /> Just a thaught and some thing to check out

 

[WSUDERMAN]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

Another area to check...<br />If the bog is only on acceleration and you can ease it up to wot, then i would look at your accelerator pump on the carb.<br /><br />If the problem is only at wot not acceleration, you might have either a fuel restriction somewhere or the fuel pump is starting to fade...

 

[vonway]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

Alternator??? when idling it is below 12v.. bounces,, but when under power even no wake speed it goes up to 12 -13 .. could this be checked with a meter? <br /><br />A fuel problem was what i thought first , but am open to any comments.. <br />T<br />THanks.

 

[vonway]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

sHOUld i change fuel filter just for the heck of it.? and if i do, does it need to be primed, (filled with gas)- the filter?? thanks

 

[jlinder]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

I would get the meter to check the voltage. When idleing you should have 13-14 volts. Underway if you only have 12-13 volts you are still not really charging.<br /><br />A charged battery just sitting there should read 12.6 volts. It sounds like you have an electrical problem. Alternator or meter.<br /><br />If may or may not be the source of your engine problem, but it needs to be resolved before you are stuck in the middle of the lake.

 

[Watercanuck]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

My 1984 3.8L OMC did this. It was water in the gas. Take off the fuel filter and empty it into a bucket. Look at it and see if there is a "gelly" under the surface. If that thats water with gas sitting on top. I empty the water from the fuel filter and it pretty much stopped but now I need my carbs cleaned because the water gets up into them from the fuel.<br /><br />Maybe this is all your problem is.

 

[Watercanuck]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

Delete double sorry

 

[vonway]

Re: 88 OMC cobra v8 cuts out at HIGH RPM

yea . I think i will stART with the fuel filter, even though it was just done 1 month ago. and ive only added one full tank of fuel since. But its worth a try.