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steveandjulia
RO# 16466
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 Posted - May 06 2012 : 13:06:29
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I have a 94 carver 380 santego with twin crusaders 454's tbi. At cruising rpm, about 3400. Both engines will lose power. Not completely die but close. If I pull back on the throttles and hit it again they will both pick back up. The only indication I have that something is gonna happen is the oil pursue gauges flutter. The gauges are electric sender type. I'm leaning toward a bad battery cable or bad ground. Does anyone have Suggestions.
Thanks, Steve
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Homeport: Portage, IN
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dancerscap
RO# 20150
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Posted - May 06 2012 : 19:38:06
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I'd look for a fuel problem; are both engines drawing from the same tank,sharing a filter?
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Homeport: Hudson,Fl.
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steveandjulia
RO# 16466
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Posted - May 06 2012 : 20:06:53
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both engines draw from individual tanks and use individual filters.
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Homeport: Portage, IN
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rythmstrat
RO# 32479
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Posted - May 06 2012 : 20:27:14
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Slip neighbor with similar problems last year...turned out to be a combo of weakening fuel pumps, fuel lines, and fuel check valves. Yes, simultaneously.
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Scott.
'Pretty Sure...'
Moose Deer Point Marina
'88 32 Carver Montego
2000 Seadoo LRV.
2008 Triumph Tiger 1050 |
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Homeport: Twelve Mile Bay, Georgian Bay, Ontario
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DEUTSCHFARMS
RO# 29188
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Posted - May 06 2012 : 21:24:39
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I heard if you wax your own boat you will not have these problems!
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Homeport: Portage, IN
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jtybt15
RO# 3300
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Posted - May 07 2012 : 00:07:06
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BOTH engines at the same time?...and separate tanks? Dang.
Do both engines have separate starting batts and charging systems?
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Charlie
There is much to be said, in a world like ours, for taking the world as you find it and fishing with a worm.-Bliss Perry, 1904
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Homeport: Ca
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steveandjulia
RO# 16466
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Posted - May 07 2012 : 07:05:42
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Fred, your way too funny. The boat has two batteries run to a selector switch. The output from the selector has a positive cable running to each engine. Each engine has an alternator. So far the only thing I've found is that the primary engine plug (the round one with a bunch of terminals) on the starboard engine was really loose, it actually fell off in my hand when I touched it. But I don't think that would explain taking out both engines at the same time.
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Homeport: Portage, IN
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Sandy
RO# 1159
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Posted - May 07 2012 : 12:56:50
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If your TBI engines are connected with a twin-engine harness, trouble with 1 engine will cause the other engine to automatically drastically reduce power ( to ~~2000rpm??) as well for safety of boat handling and engine loading. But the gauges on the good engine should not be fluctuating other than to normal range at the reduced RPM.
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| Sandy |
Edited by - Sandy on May 07 2012 12:59:24 |
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Homeport: The Vineyard
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steveandjulia
RO# 16466
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Posted - May 07 2012 : 22:07:59
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Sandy, Both engines have similar plugs. What you are saying makes sense. How do I tell if my boat is equipped with this type of harness. I do have the original wiring diagram.
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Homeport: Portage, IN
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Thudpucker
RO# 10503
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Posted - May 08 2012 : 00:21:34
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I'd like to understand your wiring diagram but I'm getting old and kinda spacey!
Sandy, as usual has the right idea.
The Drain is in the electrical system. Your fuel system is OK. (probably)
So somehow you have to get into that Schematic and separate those engines electrically and see which one is acting up.
That's what your mechanic will do.
It's easier done than you think. If it was me, I'd separate the engines at that big Red wire.
Get my volt meter on the individual batteries and see if they are both charging through the RPM scale.
An example of what I'm thinking is this:
If Alternator bearings are bad, or Slip rings are thinning, the brushes will bounce out of communication at differing RPM's.
At engine off, the battery will show 12V likely. At any charging Rpm, above Idle the Volt meter should show the Voltage going up the scale to a max of 13.8 or so.
If, at any time, the Volt meter shows a Drop, sometimes even a complete drop out, the battery is not being supported by the Alternator.
If both Batteries are connected at that Red cable, the whole charging system will drag down.
EFI is a Current Hog. Meaning it takes good Batteries and a good Charging system to keep it functioning.
Both your engines are failing at the same time is probably for the electrical system and not the separated fuel system.
I'll bet your tired of reading all this eh?
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Homeport: AL.
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Sandy
RO# 1159
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Posted - May 08 2012 : 00:50:29
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Hmmm, good question. I put the twin engine harness on my blue 5.7L MPI engines so I know approx. where to look. I think there were just 2 conductors in shielded cable going to the smae D & C pins of 4 pin (ABCD) connectors on a harness branch located under the distributor, and the B terminal of the twin harness needs a conductor to engine ground on the slave engine only... but who knows on yours?
A scan device could tell because only if the harness is connected will both engines data would be available on the designated Master engine's diagnostic connector when both keys are On. I would imagine if both engines ign. keys were On but only 1 engine running (at the dock), the running engine may not be able to be run up over safe mode of about 2000 rpm . Not sure about that under those circumstances but maybe worth a shot.
Look for any wires that go from one engine to the other. If not set up for master/slave there should be no inter-engine wires , or perhaps just engine neg ground. If set up then there would also be the twin engine M/S cable and probably another (maybe orange or red) single wire from one engine's DTC (diagnostic) 10-pin connector to the other's -- on mine that is at top of engine intake manfold, port side forward.
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| Sandy |
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Homeport: The Vineyard
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jtybt15
RO# 3300
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Posted - May 08 2012 : 01:03:03
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Do you have a single battery switch? Are both engines run off a single batt from the selector switch? Do you have to change switch position to start each engine or leave it at the same place.
Not being there to see, I'd run down those big red cables from the switch and see how they're wired. The big red cable should run to the starter. Could be you have both engines running off a single batt and the big (loose) connector is one of the causes. I would feel better with a separate start/run batt with it's own charging system and batt switch.
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Charlie
There is much to be said, in a world like ours, for taking the world as you find it and fishing with a worm.-Bliss Perry, 1904
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Homeport: Ca
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jtybt15
RO# 3300
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Posted - May 08 2012 : 01:03:04
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Do you have a single battery switch? Are both engines run off a single batt from the selector switch? Do you have to change switch position to start each engine or leave it at the same place.
Not being there to see, I'd run down those big red cables from the switch and see how they're wired. The big red cable should run to the starter. Could be you have both engines running off a single batt and the big (loose) connector is one of the causes. I would feel better with a separate start/run batt with it's own charging system and batt switch.
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Charlie
There is much to be said, in a world like ours, for taking the world as you find it and fishing with a worm.-Bliss Perry, 1904
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Homeport: Ca
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steveandjulia
RO# 16466
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Posted - May 08 2012 : 07:04:28
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I do have a single battery switch. Both batteries run to it then there are two cables connected to the common output running to each engine. Each engine has a diagnostic connector located on the rear corner. All of the wires are still in original looms, so it is very difficult to trace them down. I have noticed that one volt meter reads slightly lower that the other, but both are above 12 volts.
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Homeport: Portage, IN
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steveandjulia
RO# 16466
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Posted - May 11 2012 : 18:14:09
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Thought I would update those that helped. The primary engine plug the came right off in my hand was corroded. I cleaned the terminals reinstalled the plug and hose clamp.pulled all the battery cables and cleaned the terminals and grounding points. Took the boat for a ride today, it performed very well. It didn't miss a lick. Thank you for your input.
steve
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Homeport: Portage, IN
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Sandy
RO# 1159
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Posted - May 11 2012 : 21:29:48
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That's great! Good find.
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| Sandy |
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Homeport: The Vineyard
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Crusader fuel injected 454's Stall
