Any thoughts on low idle problems?

K

kraken

Member
Just got the boat home and was told that the boat ran fine at mid and high rpm levels but would run rough and cut out at low levels. I am thinking clogged jets but open to more suggestions. The motor is the inboard/outboard mercruiser 470.
 
rebuild the carb, if it is a Rochester 2bbl( has two idle mixture screws) then you are ahead of teh game. If it is an early Mercarb(one idle mixture screws and uses a double diaphram accelerator pump) then you need to look for a Rochester or a late model Mercarb(has a single lip accelerator pump like the Rochester) that came off of a 3.7 L or 165. Whiel you are at it, replace the points with a pertronix electronic ignition kit, its an easy swap, well worth the money
 
spareparts said:
rebuild the carb, if it is a Rochester 2bbl( has two idle mixture screws) then you are ahead of teh game. If it is an early Mercarb(one idle mixture screws and uses a double diaphram accelerator pump) then you need to look for a Rochester or a late model Mercarb(has a single lip accelerator pump like the Rochester) that came off of a 3.7 L or 165. Whiel you are at it, replace the points with a pertronix electronic ignition kit, its an easy swap, well worth the money
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the boats year is an 82 and the motor is the original mercruiser 470
 
Don't know if it is the same problem but my 82 470 was doing the same thing. I rebuilt the carb and played with the idle jets but it still would cut out. I talked to a mechanic and we reset my point gap 22 thou I beleive and have not had a low idle problem since. Just somthing to chew on.
 
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