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FXSTB posted 07-08-2003 06:57 PM ET (US)   Profile for FXSTB   Send Email to FXSTB  
My 1997 Evinrude 150, which sits upon my 1982 18'Outrage, is acting up once again. This time it boggs down and dies at idle until it dies. As I add throttle it just boggs and dies. After starting it and going thru this ordeal about 25 times, it will then run fine as long as I stay above 1000 rpm. At 1000 or less it idles roughly and ocassionally misses to the point of almost quitting. Any ideas? I cleaned all the carbs, replaced the fuel filter, cleaned the fuel screen, changed the plugs, put 100% fresh gas in the tank.
lhg posted 07-08-2003 07:02 PM ET (US)     Profile for lhg    
Fuel pump, or fuel flow restriction from bad primer bulb?
waltuh posted 07-08-2003 07:28 PM ET (US)     Profile for waltuh  Send Email to waltuh     
S.L.O.W. stands for speed limiting overheat warning on Evinrude-Johnson and the electronic control module can kick in if any of the cooling components are not circulating enough water above 2000 rpm. Maybe you need to replace the water pump impeller.
FXSTB posted 07-08-2003 09:21 PM ET (US)     Profile for FXSTB  Send Email to FXSTB     
I'm leaning toward the fuel pump as the problem. Even when I pump the bulb, as the engine is idling, it still boggs down. Thanks!
Jamie 20 outrage posted 07-08-2003 11:21 PM ET (US)     Profile for Jamie 20 outrage  Send Email to Jamie 20 outrage     
You need to look at the carbs again. Something you missed or maybe your throttle plates are not adjusted correctly. Also recheck your external, boat mounted fuel filter. Most important, you mention nothing about the plugs.. change them go for a run and then remove them and make sure that all show signs of being used. If one plug still looks new, then you are missing spark on that cylinder.
triblet posted 07-09-2003 12:06 AM ET (US)     Profile for triblet  Send Email to triblet     
If it runs well at high RPM, it's not fuel pump, and not
a fuel flow restriction. And if you pump the bulb at idle
and it still bogs, it's not fuel pump.

And it's not S.L.O.W. -- if it's overheated, SLOW will let
it run just fine up to 2000 RPM, and then it will kick and
buck. And once it cools down AND you shut it off for 30
seconds, SLOW kicks out. Been there. It's not SLOW.

I'd lean towards idle jetting too lean or too rich. Or maybe
carbs out of synch. What do the plugs look like? Jamie's
suggest is a good one, but first look at the old plugs. Take
it out for a nice run above 1000 RPM, for at least 10
minutes, then put it alongside the dock and let it kick and
buck and die. Then look at the plugs.


FXSTB posted 07-09-2003 09:56 AM ET (US)     Profile for FXSTB  Send Email to FXSTB     

A few other tidbits of info: It seems to me that the engine becomes severly flooded while not running. Once it 'clears up' after starting 25+ times, it will idle, I guess, until it runs all the gas out of the tank. I idled for 30 minutes in a no wake zone yesterday with only an occasional spit and sputter, but it will not die. Won't be able to check pulgs because as I was hauling the boat out at a 'strange' ramp yesterday the prop make contact with concrete. It's been a tough week! boating wise....Does this help?

Bigshot posted 07-09-2003 10:33 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Triblet is 100% on the money....go from there.
FXSTB posted 07-09-2003 06:03 PM ET (US)     Profile for FXSTB  Send Email to FXSTB     
Update: I just discovered that the gasket on the white plastic fuel fitting that attaches the fuel line to the front of the fuel pump may have been improperly installed and could have been leaking some air into the system. Could this cause the symptoms I have been describing?
logjamslam posted 07-10-2003 01:08 AM ET (US)     Profile for logjamslam  Send Email to logjamslam     
I don't know if an air leak into your fuel system caused your problem. It may cause short engine life.

I recently purchased an outboard with a brand new powerhead and 200 hrs on the rest of it. According to the dealer that put on the new powerhead an air leak was the reason the old one only made it to 200hrs.

Bigshot posted 07-10-2003 10:21 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Air leaks mean less gas.....probably your problem.

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