Re: [OMC-Boats] engine wierdness

From: jd <jdood@...>
Date: Thu, 29 Oct 2009 10:00:31 -0700

i just don't see how it can be any kind of electrical system thing,
esp since i re-did most of the wiring this summer and it's now very
solid. but who knows. and what "electrical" stuff is happening
with the engine while its running anyway?

- one wire sends power to the starter when the key is turned - that is
working fine

- there's a purple wire that runs to the electric choke (i guess) on
the carb - perhaps that?

- there's theres a wire going to the coil and stuff - perhaps that?

- then there's the alternator - perhaps that?

The last 3 on this list i don't really understand at all, esp what
their function is AFTER the engine is up and running. If
electrical, it has to be something that functions not just to start
the engine, but to keep the engine running. Doesn't that just
narrow it down to the alternator? Or is there other electrical stuff
that has to do with the engine staying running?

On Oct 29, 2009, at 9:02 AM, ANDY PERAKES wrote:

> I tend to agree with the electrical suspect. Fuel/air problems
> generally linger a bit and don't result in an immediate drop-out
> like you describe. Anything is possible though. I like the
> guidance Lee sent out awhile back where he said to eleiminate the
> possibility of electrical problems first since that's usually
> quicker and easier to do. Trouble is, intermittent electrical
> problems can be a nightmare to trace. Is there any possibility of
> hooking up some basic instrumentation to see if there is any
> electrical effect when it happens? If you see a sudden voltage
> change or current drop out, that would be a clear indicator. Good
> luck!
> Andy
> '67 Reveler
> ----- Original Message -----
> From: "jd" <jdood@...>
> To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...
> >
> Sent: Thursday, October 29, 2009 11:44:16 AM GMT -05:00 US/Canada
> Eastern
> Subject: [OMC-Boats] engine wierdness
> took my boat out for the last of possible testing this season before
> things get too cold and rainy. didn't go as i hoped. i'll
> try and condense this down to it's simplest form:
> BEFORE (about a month ago):
> except for some slightly fast idling, engine ran well. Then I
> noticed it starting to do this weird intermittent thing where all the
> power (throttle) would just drop down to zero. It seemed to happen
> mainly during acceleration up to plane. This all was happening at
> the end of the season, so I have pretty much had the boat sitting for
> the past month waiting for parts and time. But I was thinking it was
> related to my falling apart carb and / or and electrical thing
> related to my rebuilt shifter switch. so......
> AFTER (yesterday):
> - I installed my nice practically new carb (rebuilt by flying fish).
> keep in mind, it was the exact same carb i have always had on the
> boat, just completely rebuilt. I also changed my air water separator
> cartridge beforehand to avoid any chance of issues from fuel that had
> sat for a month.
> - I installed a NOS shifter switch that I recently acquired. Tested
> with light after install, everything checked out. And as I said,
> it's basically new.
> So after those two major upgrades, the engine is doing the same dang
> thing. Started up, let it warm up a bit, took it for a spin.
> About 5-10 seconds after getting up on that first plane everything
> just dropped down to zero and unlike the past times, this time the
> engine died at the same time. Had to crank it over several times
> for it to start back up, and when it did, with the red lever set at
> full throttle it took several seconds for the RPMS to climb up to
> where they should be. I limped back to the dock.
> Then while at the dock idling for a few minutes, all of the sudden
> it just died again. At idle this time, not while accelerating.
> And every time it dies it is quick. It's not like it sits there and
> slowly dies. It just cuts out suddenly. So I of course tried to
> restart it. Nothing for several tries, then it acted like it was
> going to start, then it finally starts, coughing and sputtering a
> bit, then very slowly climbs up to full throttle (in neutral).
> I started thinking maybe a fuel pump issue. Disconnected fuel
> line, cranked engine, plenty of pumping of fuel happening.
> It seems sort of electrical in the way it just all of the sudden dies
> either at idle or accelerating. Yet when it finally starts back up it
> coughs and sputters and smokes a bit. Which sounds like bad fuel,
> yet I have a new water/fuel separator cartridge, the carb is new,
> and nothing looks dirty with the inline regular fuel filter.
> Any ideas?
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Received on Thursday, 29 October 2009

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