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FXSTB posted 07-08-2003 06:57 PM ET (US)
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)
Fuel pump, or fuel flow restriction from bad primer bulb?
waltuh posted 07-08-2003 07:28 PM ET (US)
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)
lhg,
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)
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)
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.

Chuck
FXSTB posted 07-09-2003 09:56 AM ET (US)
Fellas,
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)
Triblet is 100% on the money....go from there.
FXSTB posted 07-09-2003 06:03 PM ET (US)
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)
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)
Air leaks mean less gas.....probably your problem.

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Author	Topic: Calling all Mechanics
FXSTB	posted 07-08-2003 06:57 PM ET (US) 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) Fuel pump, or fuel flow restriction from bad primer bulb?
waltuh	posted 07-08-2003 07:28 PM ET (US) 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) lhg, 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) 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) 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. Chuck
FXSTB	posted 07-09-2003 09:56 AM ET (US) Fellas, 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) Triblet is 100% on the money....go from there.
FXSTB	posted 07-09-2003 06:03 PM ET (US) 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) 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) Air leaks mean less gas.....probably your problem.