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Old 07-02-2016, 05:18 AM   #1
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Default Dies Suddenly while Cruising

89 2000sc with a 5.0 Mercuiser and Quadrajet. Cruising along about 3000 rpm then quits suddenly. No spit or sputter just bow dropping deadness. I had the carb completely gone through by a reputable shop before I launched for the first time this year. They told me I had water in the tank as the carb had a lot of water. I completely drained the tank, new separator, added fuel and took her out. Cruising, cruising, no problems then 5-10 min in it just quits. I found the coil wire was broken so I nursed it to a friends dock and returned with a new wire set. Same problem. In my own uneducated reasoning, I don't think it's fuel. Just for grins, Immediately after dying I operated the accelerator manually and it squirted plenty of fuel. When pulling the coil wire and lying it close to the coil there appears to be plenty of spark. But just smells of ignition to me, not fuel.

Thoughts?
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Old 07-02-2016, 11:57 AM   #2
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Sunder dieing would be an electrical issue. Bad coils or ignition sensor in the distributor are know for this type of fault. You'll need to troubleshoot these using the merc guide next time it occurs.

Thunderbolt IV?
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Old 07-02-2016, 02:02 PM   #3
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Thanks Mike, yes there's an ignition module bolted on the port side that says Thunderbolt. Whether it said "IV" I do not remember.
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Old 07-02-2016, 02:43 PM   #4
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Quote:
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Thanks Mike, yes there's an ignition module bolted on the port side that says Thunderbolt. Whether it said "IV" I do not remember.
If your engine still has the plastic cowl over the flame arrestor it should say it on there.

Is the module a square block about 4x4x2 inches? If so old style TB IV.
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Old 07-02-2016, 03:01 PM   #5
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No it is somewhat triangular mounted with three bolts to the port cooling manifold.
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Old 07-02-2016, 03:04 PM   #6
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Ok that is the newer TB IV.
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Old 07-02-2016, 03:12 PM   #7
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How is this tested? Is it a likely culprit? Looks like a spendy part.
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Old 07-02-2016, 04:03 PM   #8
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Quote:
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How is this tested? Is it a likely culprit? Looks like a spendy part.


See post 2 for likely causes. Go to the documents tab to get your merc manual which has the troubleshooting guide.
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Old 07-02-2016, 11:11 PM   #9
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If it only happens when I'm cruising along that makes it intermittent doesn't it? Potentially all could test fine?
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Old 07-03-2016, 03:41 AM   #10
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You will need to test while the fault exists to find the issue.

Electric parts get hotter while running at higher rpm than sitting at idle.

Have you tried letting it idle at the dock for 30 minutes to see if it dies?
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