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Old 04-18-2009, 10:35 AM   #1
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Question Engine Trouble- 1996 Johnson 130 V4 Outboard

Recently, I've been having troubles with my engine. The engine throttles down on its own and it sounds like it's coughing. I rebuilt the carbs and changed the fuel pump, coil packs, and even the gas tank. The engine ran fine most of last season (after the changes) but then it started up again in the fall. Before this season, I changed the spark plugs, inline filter, and I drained the water seperator. I replaced the fuel line and the bulb. And it's still not fixed. I have no idea whats wrong with it anymore. Any ideas would be greatly appreciated.
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Old 04-18-2009, 10:50 AM   #2
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Sounds like the computer is activating self-shutdown. Check to see if your engine is overheating or if it has low oil.
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Old 04-18-2009, 11:00 AM   #3
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Quote:
Originally Posted by amsimonsjs View Post
Sounds like the computer is activating self-shutdown. Check to see if your engine is overheating or if it has low oil.
It usually runs at 4500 RPM but it'll drop down to 2500 RPM and after 20 minutes or so, it'll go back to 4500.
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Old 04-18-2009, 11:19 AM   #4
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It's a 1996. Does it even have a computer or oil?
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Old 04-18-2009, 11:30 AM   #5
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All loopers and some crossflow OMCs had the self-shutdown in case soemthing went wrong. It was very primitive, but it did work. And they had the VRO, which mixed the oil for you. These had a tendency to fail, and they would cause the motor to shutdown when there was no oil. You could have air in your oil line, causing the motor to slow down when it hits air, and get back up to rpms when it detects oil again.

Do you have an alarm or idiot lights? If you have an alarm, it should sound if it was something computer related, unless the buzzer is broken. If you have the idiot lights, they should tell you whats going wrong. (i.e. overheating, low oil, etc.)

Do you have a temp gauge? Does the temp shoot up when it slows down?

-Alex
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Old 04-18-2009, 01:15 PM   #6
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The engine was running cool. The engine only shut down when I put in neutral and after a few moments when left idling. Otherwise, it only slowed down and then picked up rpms on it's own.

Last edited by kellyannstriper; 04-19-2009 at 09:38 AM.
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