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Old 07-01-2015, 01:09 AM
dykstra19 dykstra19 is offline
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Join Date: Feb 2015
Boat: 1993 Stars and stripes
Location: northwest
Posts: 13
A little summer help???

Hello, I have a 1993 Stars and stripes with the ford 351 and 450 hrs. I have been using it successfully this summer but recently it seems to have an inconsistent idle. I changed the dist cap but I really want to diagnose this problem so I don't just keep throwing parts at it. It seems to idle low after putting it into neutral or when I put it into gear from neutral. I have the idle screw running about 800 rpm but it will drop lower here and there and every once in a while it will die. It seems to run at high speeds with ease but that idle is inconsistent. Would this be a fuel filter problem?? clean the carb? what would you suggest. Thanks so much for the help!!
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Old 07-01-2015, 02:32 AM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is offline
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Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 16,214
Assuming it has had a recent tune-up, you are likely in need of a carb rebuild. Over time, gaskets shrink and idle circuits get clogged with varnish. Both of these create a lean idle condition.

Fuel filter doesn't do much for the idle system. Since you are fine running at speed, that confirms it. Never a bad thing to replace the fuel filter, but in this case it won't help.
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