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 1983 Black Max 150 "coughing" at idle
#11492195
03/22/16 01:45 AM
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Joined: Sep 2011
Posts: 177
Shawn the printer
OP
Outdoorsman
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OP
Outdoorsman
Joined: Sep 2011
Posts: 177 |
Just finished carb rebuilds and link and sync. Engine runs great throttled up, just coughs while in gear idling. Anyone have an idea of what it may be.
Thanks to all!
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11492248
03/22/16 02:03 AM
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Joined: May 2013
Posts: 763
justchillin
Pro Angler
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Pro Angler
Joined: May 2013
Posts: 763 |
Sounds like you may have a lean "sneeze"/ cough. You need to figure out which carb(s) is causing it. Plenty of you tube videos on how to adjust air mix screws on the carbs. One or more needs to be turned out. Only turn about a 1/4 turn at a time. Do this in the water or in a test tank.
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Re: 1983 Black Max 150 "coughing" at idle
[Re: justchillin]
#11492278
03/22/16 02:17 AM
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Joined: Sep 2011
Posts: 177
Shawn the printer
OP
Outdoorsman
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OP
Outdoorsman
Joined: Sep 2011
Posts: 177 |
Only problem on this one is the carbs are all fixed jet and no adjustment screws.
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11492401
03/22/16 02:59 AM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
how did ya set idle timing? on tha hose or in gear in tha water? all bleed lines good and fittings (tha one-way ones) workin' like they should?
Last edited by TLW; 03/22/16 03:04 AM.
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11492524
03/22/16 04:42 AM
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Joined: Sep 2011
Posts: 177
Shawn the printer
OP
Outdoorsman
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OP
Outdoorsman
Joined: Sep 2011
Posts: 177 |
I set it on the hose. I'll try to get it back in the water and check it.
Thanks
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11492560
03/22/16 06:37 AM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
when ya do don't even worry 'bout "numbers and or rpm"... set tha timin'/rpm (in gear) ta whatever you and tha motor are happy with.... idle timin' numbers in "tha book" don't always hold true to a lotta motors (V6 mercs)... mainly justa ball park deal......gl
Last edited by TLW; 03/22/16 06:41 AM.
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11492743
03/22/16 12:37 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
Many times that idle cough is caused by the idle timing module.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: 1983 Black Max 150 "coughing" at idle
[Re: gary purdy]
#11492918
03/22/16 01:49 PM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
Many times that idle cough is caused by the idle timing module. absolutely... first thing ta float test.. gettin' a "little" forgetful!
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11494786
03/23/16 03:11 AM
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Joined: Sep 2011
Posts: 177
Shawn the printer
OP
Outdoorsman
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OP
Outdoorsman
Joined: Sep 2011
Posts: 177 |
Thanks guys got rid of the module a while back. Hopefully get time the next few days to check and set the timing on the water.
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Re: 1983 Black Max 150 "coughing" at idle
[Re: Shawn the printer]
#11533657
04/11/16 02:56 AM
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Joined: Sep 2011
Posts: 177
Shawn the printer
OP
Outdoorsman
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OP
Outdoorsman
Joined: Sep 2011
Posts: 177 |
Finally had some time to work on it. I had a switchbox working intermittently and losing a cylinder at times. Still sounds like a hot rod idling, but not coughing or dying anymore. 
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