Evinrude 140 V4 1990 intermittent rpm drop

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Pannet

Seaman Apprentice
Joined
Feb 14, 2002
Messages
39
Sometimes during cruising at 4000-5000 rpm, the rpm suddenly dropped to 3000+ and sometime fluctuated between 3500-4000+ rpm. Bringing the throttle back to idle for a minutes and push up, the problem still exist. Shut off the key and restarted suddenly, it started easily and the problem was gone. Today I ran 3 hours continuously and this problem occurred 4 times. Everytime the problem disappeared after restarting.<br />I have checked fuel system --it's OK. I wonder why the problem just disappeared after restarting. I think this might be an electrical system problem. Any idea ?
 
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baby j

Recruit
Joined
Jul 14, 2002
Messages
2
Re: Evinrude 140 V4 1990 intermittent rpm drop

i had the same problem and it was the stater,also changed the power pack.that was 3 years ago never had no more problem.and i use my boat at least every weekend.
 
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dewley

Seaman Apprentice
Joined
May 5, 2002
Messages
31
Re: Evinrude 140 V4 1990 intermittent rpm drop

I am no technician, had experienced same kind of problems in the past few months, was the power pack. The engine was a close cousin to what you have. As was pointed out, test do not guess, part ran $250 US. Good luck.
 
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Pannet

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Joined
Feb 14, 2002
Messages
39
Re: Evinrude 140 V4 1990 intermittent rpm drop

Thank you very much baby j & dewly,<br /><br />I've just found out that after replacing the fuel filter, the problem seems to disappear. I wish my observation on restarting to correct the problem is wrong. Otherwise, I may have to spend more money changing the power pack / stater.
 
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kenimpzoom

Rear Admiral
Joined
Jul 13, 2002
Messages
4,807
Re: Evinrude 140 V4 1990 intermittent rpm drop

Pannet,<br /><br />If fuel filter was plugged, restarting may have helped as shutting it off would allow some dirt to move around and remove restriction. After running, the dirt would build up again.<br /><br />I carry an extra fuel filter just in case. I also have put a universal fuel filter right next to the gas tank to prevent any junk getting to the harder to change engine fuel filter.<br /><br />Chok dee!<br /><br />La kon,<br />Ken
 
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dewley

Seaman Apprentice
Joined
May 5, 2002
Messages
31
Re: Evinrude 140 V4 1990 intermittent rpm drop

Another item to check is a cracked fuel hose or connector fitting. Hose clamp loose, bottom line is fuel pump will pull air easier than pull fuel. A pin sized hole will cause poor fuel delivery, had this problem also which seems similiar to yours. Good luck
 
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