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36 vanguard loses rpms at full throttle
https://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=39821		 Page 1 of 1
Author:  one_shot [ Wed Apr 17, 2013 9:06 pm ]
Post subject:  36 vanguard loses rpms at full throttle
Have a 36 vanguard with 189 hours. Motor runs great except for every now and then, seems to only do it in salt water. I can be driving WOT and all of a sudden I start losing rpms...if I back off on the throttle the problem seems to go away. I noticed this past weekend when the motor would loose rpms the fuel filter would be full to the top, when it runs good its only 1/2 full. Any idea what the problem could be?
Author:  Team Camo [ Wed Apr 17, 2013 9:22 pm ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
Are you sure the plug wires aren't getting salt water intrusion & arcing out? You said it only does it in salt water...
Author:  forever draggin [ Wed Apr 17, 2013 11:12 pm ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
My buddy's motor did that. It was brand new. Would do it when the motor got hot. Something with the carb, he just bought a take off from mb and never had that problem again
Author:  duckduckboom [ Thu Apr 18, 2013 6:10 am ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
Touch the heat shield next time it does it(unless you have a prexsiting heart problem or pace maker)
Author:  one_shot [ Thu Apr 18, 2013 7:15 am ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
I did put some silicone where the wire runs into the boot then taped the hell out of it with electrical tape. Did notice that when I grab a plug wire it gives me a pretty good shock. Is that normal? My next try to fix this was get new spark plug wires.
Author:  duckduckboom [ Thu Apr 18, 2013 7:36 am ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
Check where the wire comes out if the cowling
Author:  one_shot [ Thu Apr 18, 2013 9:34 am ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
Wires don't look like they are in bad condition, boat has been kept in a shop it's whole life.
Author:  forever draggin [ Thu Apr 18, 2013 1:41 pm ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
Run it with the lights off, see if u can see an arc
Author:  Quackhead62 [ Thu Apr 18, 2013 1:47 pm ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
i had the same issue with my motor a few years ago. All I did was get a can of a sealant for plug wires from a auto parts store sprayed the hell out of my wires an wraped them with wire-loom all the way to the coil an never had a issue with it doing that again
Author:  odustbrown [ Tue Aug 11, 2015 1:57 pm ]
Post subject:  Re: 36 vanguard loses rpms at full throttle
Just fixed the same problem on my motor. It would cut out at WOT, then act right when I let off. It would've taken me forever to figure out why if I hadn't been running in the dark. I happened to look back and see the spark jumping across the #2 boot when it would act up.

The terminal on the arcing plug wire was rusty as hell. I scrubbed the new terminal and the bare wire down with Noalox, put it back in the boot, doped the wire end of the boot with some Dow 111, and slid a big piece of heat shrink over the whole thing. Once I shrunk the tubing down as far as it would go, put more Dow 111 between the tubing and the wire, and then wrapped it all in rubber splicing tape. A little more 111 between the boot and the insulator, then I should be okay unless I sink it.
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