4.3L Mercruiser spitting and sputtering after running for about an hour 20ft Scarab

[1975v4]

To whomever can help...

I took my boat out cruising yesterday and ran into an issue of spitting and sputtering while trying to accelerate. I have never had this problem before, it happened after about an hour of running 3/4s throttle so almost wide open. We stopped into a marina for a few mins to get a snack, after pulling out and attempting to get back on the gas all that happening was spitting and sputtering like a missfire. We let it sit for about 20 mins and it fired right up and was running fine until we were about 100 yards from our destination, i limped it to the island (spitting and sputtering). After talking with some guys they said my coil pack was getting hot and that if i wanted to get it back to the trailer with it running good to let it cool down for a couple of hours. I did just that and it ran great while heading back to the landing. So is my problem the coil? I just had new plugs and wires done this past spring. Could it be the distributor?

Anything would help.

Thanks

Steve

 

[alldodge]

Re: 4.3L Mercruiser spitting and sputtering after running for about an hour 20ft Scar

Could be a vacuum on the fuel tank, bad gas, and it could be the coil. Could also be a vapor lock issue but that depends on type of gas used, how much heat is invloved (how hot was it). The easy thing is to pull the cap and have a look, then if you can find a replacement coil from a good engine swap and see if that stops the problem. It sounds like a heat or time related issue (fuel vacuum).

 

[Bondo]

Re: 4.3L Mercruiser spitting and sputtering after running for about an hour 20ft Scar

To whomever can help...

I took my boat out cruising yesterday and ran into an issue of spitting and sputtering while trying to accelerate. I have never had this problem before, it happened after about an hour of running 3/4s throttle so almost wide open. We stopped into a marina for a few mins to get a snack, after pulling out and attempting to get back on the gas all that happening was spitting and sputtering like a missfire. We let it sit for about 20 mins and it fired right up and was running fine until we were about 100 yards from our destination, i limped it to the island (spitting and sputtering). After talking with some guys they said my coil pack was getting hot and that if i wanted to get it back to the trailer with it running good to let it cool down for a couple of hours. I did just that and it ran great while heading back to the landing. So is my problem the coil? I just had new plugs and wires done this past spring. Could it be the distributor?

Anything would help.

Thanks

Steve

Ayuh,.... Welcome Aboard,... The 4.3l has been 'round Along time, 'n Many variations,.... What's Yer's,..??

 

[1975v4]

Re: 4.3L Mercruiser spitting and sputtering after running for about an hour 20ft Scar

Running 93, not sure about vacuum. It is the 1996 4.3L.

 

[Bondo]

Re: 4.3L Mercruiser spitting and sputtering after running for about an hour 20ft Scar

Running 93, not sure about vacuum. It is the 1996 4.3L.

Ayuh,... Carbed,..?? Which carb,..??