96fourwinns240
Recruit
- Joined
- Jul 9, 2012
- Messages
- 2
Hi iBoaters,
We have a 1996 Four Winns 240 Horizon with a Ford 351 windsor 5.8 EFI engine. It surges on idle and wont stay running for long and has no power under load.
Background: (I'll try to keep it short)
When we got the boat, it was misfiring. We replaced the fuel injectors, but turns out it was the oil pressure sensor and the boat was running in slow mode to protect itself. My Dad and I took it out over the winter, and rebuilt it from the block up. My Dad had to heat up every bolt and use a vice to get them out, just to give you an idea on how the PO treated the engine. First run after the rebuild with water, water was inside the cylinders. Lots of gaskets, time, and $$ later, the shop just told us to bring it to them and they would go through it for us. Turns out there was a hole in the cylinder that wasn't there when they treated it, and the piston rings scraped it open. It would be more effective if we just bought a re-manufactured longblock.
Anyway, a re-manufactured 351w marine longblock, new risers, machine work to lower intake, and pressure checked risers and elbows and lots of other new parts later, it runs without water in the cylinder!
We noticed that it was surging a little and then it just died in idle. We thought 2 things-
-Assumed it was the idle, and since the computer controls it, we just thought the idle was low, and we were going to have the dealer check it out.
-Thought the gas was bad (running from a 2 gallon can and we thought it might have had some water in it) so we filled up the boat tank, which we had just cleaned, put a new fuel filter in, and still had the same problem, so we know the gas is fine)
After it died in idle, we would turn it back on, same thing over and over again. It will stay running with a little but of throttle, but surges a little.
When under a load, it will get to ~2000 rpms at full throttle, knock (more like ping) and have no power, was not even going past 10mph). Do you know how hard it is to dock with a boat that stalls going slow speeds, forcing you to dock going pretty fast? haha
We really have no idea. We are thinking it is the timing, but we have moved the distributer back and forth and didn't really notice a difference. If it was off a tooth, it would be way off and hard to start. We are using iridium plugs, and I know (with dirt bikes anyways) they burn at a lower rate i believe, not sure if it would make a difference. Just looking to see if this has happened to anyone before, and what solved the problem. We are going to try to time it using an advanced time gun, but it could be anything really, hopefully something stupid.
Any input would be helpful! Thanks!
We have a 1996 Four Winns 240 Horizon with a Ford 351 windsor 5.8 EFI engine. It surges on idle and wont stay running for long and has no power under load.
Background: (I'll try to keep it short)
When we got the boat, it was misfiring. We replaced the fuel injectors, but turns out it was the oil pressure sensor and the boat was running in slow mode to protect itself. My Dad and I took it out over the winter, and rebuilt it from the block up. My Dad had to heat up every bolt and use a vice to get them out, just to give you an idea on how the PO treated the engine. First run after the rebuild with water, water was inside the cylinders. Lots of gaskets, time, and $$ later, the shop just told us to bring it to them and they would go through it for us. Turns out there was a hole in the cylinder that wasn't there when they treated it, and the piston rings scraped it open. It would be more effective if we just bought a re-manufactured longblock.
Anyway, a re-manufactured 351w marine longblock, new risers, machine work to lower intake, and pressure checked risers and elbows and lots of other new parts later, it runs without water in the cylinder!
We noticed that it was surging a little and then it just died in idle. We thought 2 things-
-Assumed it was the idle, and since the computer controls it, we just thought the idle was low, and we were going to have the dealer check it out.
-Thought the gas was bad (running from a 2 gallon can and we thought it might have had some water in it) so we filled up the boat tank, which we had just cleaned, put a new fuel filter in, and still had the same problem, so we know the gas is fine)
After it died in idle, we would turn it back on, same thing over and over again. It will stay running with a little but of throttle, but surges a little.
When under a load, it will get to ~2000 rpms at full throttle, knock (more like ping) and have no power, was not even going past 10mph). Do you know how hard it is to dock with a boat that stalls going slow speeds, forcing you to dock going pretty fast? haha
We really have no idea. We are thinking it is the timing, but we have moved the distributer back and forth and didn't really notice a difference. If it was off a tooth, it would be way off and hard to start. We are using iridium plugs, and I know (with dirt bikes anyways) they burn at a lower rate i believe, not sure if it would make a difference. Just looking to see if this has happened to anyone before, and what solved the problem. We are going to try to time it using an advanced time gun, but it could be anything really, hopefully something stupid.
Any input would be helpful! Thanks!