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Max Online: 36273 @ 01/23/13 02:34 PM
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#11492195 - 03/21/16 08:45 PM 1983 Black Max 150 "coughing" at idle
Shawn the printer Online   content
Outdoorsman

Registered: 09/02/11
Posts: 142
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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#11492248 - 03/21/16 09:03 PM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
justchillin Offline
Angler

Registered: 05/05/13
Posts: 404
Loc: cedar creek lake
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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#11492278 - 03/21/16 09:17 PM Re: 1983 Black Max 150 "coughing" at idle [Re: justchillin]
Shawn the printer Online   content
Outdoorsman

Registered: 09/02/11
Posts: 142
Only problem on this one is the carbs are all fixed jet and no adjustment screws.

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#11492401 - 03/21/16 09:59 PM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2039
Loc: ft worth
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?


Edited by TLW (03/21/16 10:04 PM)

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#11492524 - 03/21/16 11:42 PM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
Shawn the printer Online   content
Outdoorsman

Registered: 09/02/11
Posts: 142
I set it on the hose. I'll try to get it back in the water and check it.
Thanks

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#11492560 - 03/22/16 01:37 AM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2039
Loc: ft worth
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


Edited by TLW (03/22/16 01:41 AM)

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#11492743 - 03/22/16 07:37 AM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10773
Loc: Littlefield Tx & Lake A. H. US...
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” GOD IS GOOD

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#11492918 - 03/22/16 08:49 AM Re: 1983 Black Max 150 "coughing" at idle [Re: gary purdy]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2039
Loc: ft worth
Originally Posted By: gary purdy
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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#11494786 - 03/22/16 10:11 PM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
Shawn the printer Online   content
Outdoorsman

Registered: 09/02/11
Posts: 142
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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#11533657 - 04/10/16 09:56 PM Re: 1983 Black Max 150 "coughing" at idle [Re: Shawn the printer]
Shawn the printer Online   content
Outdoorsman

Registered: 09/02/11
Posts: 142
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. grin

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