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#1
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Thanks for all feedback spare
I was given a can of omc spray decarb I soaked the carbs last night Will pickup some seafoam on way home tonight too I have been doing a LOT of trolling for stripers and assume this is probably worst case for these engines? Here's what happened: last weekend while running down the bay at 4K after about 1/2 hr engine loses rpm. I back off Check everything Seems ok I turn around head home running about 3.5 k no problem All is well Next day check fuel filter, oil etc Looks fine Run down bay 4K Exact same spot it happens again Run back to dock 3.5k no problem Check everything again Looks good Did the decarb last night Letting it soak Will dump seafoam in fuel also Tx Bill
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"Good People drink good beer" Hunter S Thompson 87 V20 
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#2
06-28-2017, 09:24 PM
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Not carb...what else?
So I did the decarb thing and am still having this same issue...so it likely is not carbon buildup.
Here's what happened: last weekend while running down the bay at 4K after about 1/2 hr engine loses rpm. I back off Check everything Seems ok I turn around head home running about 3.5 k no problem All is well Next day check fuel filter, oil etc Looks fine Run down bay 4K Exact same spot it happens again Run back to dock 3.5k no problem Check everything filter, fuel line connections, etc again tonight. Fire it up, run down the bay,same thing; cuts out losing rpm, bad vibration. Check ball-it's fine. Hit choke button-no change. Shut it off, re-start and am able to run home at low rpm running smoothly. So it runs fine for about 10 mins, then repeats the above scenario-3 times in a row. Thoughts? Tx Bill
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"Good People drink good beer" Hunter S Thompson 87 V20 Last edited by BillTex; 06-28-2017 at 09:29 PM.
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#3
07-02-2017, 04:24 PM
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How do decarb ? Do you have to remove the carbs?
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love to fish
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#4
07-02-2017, 05:59 PM
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when u say runs back at 3500 fine, does that mean your holding it at 3500 or all it will do is 3500?
conventional wisdom is fuel, fire, or compression. you think you've checked fuel with the decarb, so next thing i'd check would be fire. get a fire fly spark tester and check. coil might be dropping out after it gets warm or plug.
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#5
07-02-2017, 10:36 PM
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Looks like ECU is shutting down to safe mode. Boat is pulled and more testing after the holiday
 Def electrical...coil...or ECU? Will find out soon.... Thx All
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"Good People drink good beer" Hunter S Thompson 87 V20
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#6
07-03-2017, 06:16 AM
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what kind of engine is this
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