Posted: 6/28/2016 12:32:57 PM EDT
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There's a lot of RKI's out there, so I hope someone will have an idea on this.
I have a boat with a Mercruiser 5.0 Alpha I in it. Haven't used it much the last 5-6 years. Drained most of old gas out and refilled with fresh, no ethanol fuel. New water separator/fuel filter installed. Boat starts up and runs good. Jumps right up on plane. Problem is, after 15-20 mins of running, it will "miss". Feels like it loses power for a fraction of a second and comes right back on. If I stop and let the boat cool down a bit. It runs good again. Any ideas on where to start? |
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Quoted: duh it's a carb  Quoted: Quoted: Is it carbureted or EFI? Does it have an electric fuel pump? <--Mercruiser tech.  duh it's a carb |
Hope he isn't an Arfcommer...
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Quoted:
It's carbureted. 1998 vintage. Not sure on the fuel pump. Quoted:
Quoted:
Is it carbureted or EFI? Does it have an electric fuel pump? <--Mercruiser tech. It's carbureted. 1998 vintage. Not sure on the fuel pump. Fuel pump (if it's electric) will be mounted on the left side of the engine (looking from inside the boat) on the front. It will be a silver or black cylindrical looking electric motor with two wires and a fuel line entering from the bottom and exiting from the top. As mentioned above, the fuel may still have some water in it or the fuel tank pickup tube is clogged or the anti-siphon valve (on the fuel tank) is getting clogged up. Carb could also have debris floating around in it clogging up the jets intermittently. |
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Quoted:
duh it's a carb Quoted:
Quoted:
Is it carbureted or EFI? Does it have an electric fuel pump? <--Mercruiser tech. duh it's a carb Sorry. I couldn't remember if they had gone to the TBI B.S. yet or not. Serial numbers really help. BTW, it does have an electric fuel pump.
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Quoted:
There's a lot of RKI's out there, so I hope someone will have an idea on this. I have a boat with a Mercruiser 5.0 Alpha I in it. Haven't used it much the last 5-6 years. Drained most of old gas out and refilled with fresh, no ethanol fuel. New water separator/fuel filter installed. Boat starts up and runs good. Jumps right up on plane. Problem is, after 15-20 mins of running, it will "miss". Feels like it loses power for a fraction of a second and comes right back on. If I stop and let the boat cool down a bit. It runs good again. Any ideas on where to start? Had a buddy with the same issue. Turned out to be the electronic module in the distributed. When it would get warmed up after running for a few minutes, it would start dropping spark to one/some of the plugs. If you let the boat sit for a while and cool down, it would start running good again...then once it got hot it would start cutting out again. |
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Quoted:
Had a buddy with the same issue. Turned out to be the electronic module in the distributed. When it would get warmed up after running for a few minutes, it would start dropping spark to one/some of the plugs. If you let the boat sit for a while and cool down, it would start running good again...then once it got hot it would start cutting out again. Quoted:
Quoted:
There's a lot of RKI's out there, so I hope someone will have an idea on this.... Had a buddy with the same issue. Turned out to be the electronic module in the distributed. When it would get warmed up after running for a few minutes, it would start dropping spark to one/some of the plugs. If you let the boat sit for a while and cool down, it would start running good again...then once it got hot it would start cutting out again. That's exactly what it's doing. |
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Went out and ran it again. Same thing. (It does have an electric fuel pump). Changed out the water separator/fuel filter again. Pulled two plugs. Both looked good.
Put the guy that wanted to ride it off until this weekend. I'm going to go tomorrow (after I drop my kid and his family off at the airport) and try to find a coil, cap, rotor, distributor module and wires at a decent price. If it still does it, the next step is the plugs and then on to the fuel system. |