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Old 07-31-2017, 10:40 PM   #11
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And leaking IN can lead to needing a new engine.
DEFINITELY don't want that!!! Will make sure he checks/watches that.
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Old 07-31-2017, 11:12 PM   #12
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Mechanic says she's not throwing any codes which is why it's taking him a while to figure it out. A friend's husband who is well versed in automotive engines says that's a pretty clear sign it's fuel related or possibly a bad sensor. Agree or disagree?
I am no expert, but it could be a fuel issue. Has anyone checked the fuel pressure at the fuel rail?
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Old 07-31-2017, 11:20 PM   #13
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Mechanic says she's not throwing any codes which is why it's taking him a while to figure it out. A friend's husband who is well versed in automotive engines says that's a pretty clear sign it's fuel related or possibly a bad sensor. Agree or disagree?
A bad sensor should show up in a fault code. I'm thinking a fuel related issue.
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Old 07-31-2017, 11:24 PM   #14
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Shorter posts in future I promise Mike! (LOL)
What you say on props make perfect sense so should be able to rule that out.
I will definitely run the pickup screen by him. Replacing injectors will be last resort. I hear from an automotive mechanic that there is a test that can be done to see if injectors are bad...he says essentially anything electrical can be tested but admittedly he doesn't know boats at all. Thoughts?
It's not the electrical part of the injector that typically goes bad but the mechanical side such as the seat not sealing causing them to drip but the result would not be what you are seeing. They could also be dirty and sputtering, this can be cleaned but again your issue does not suggest this IMO.
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Old 07-31-2017, 11:26 PM   #15
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I am no expert, but it could be a fuel issue. Has anyone checked the fuel pressure at the fuel rail?

I agree 100%.
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Old 07-31-2017, 11:28 PM   #16
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I know you said the spark plugs were replaced but what about the distributor cap, rotor, spark plug wires. Does the loss of rpm only happen when the engine is warm? If so the ignition coil may be breaking down.
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Old 08-01-2017, 12:42 AM   #17
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I know you said the spark plugs were replaced but what about the distributor cap, rotor, spark plug wires. Does the loss of rpm only happen when the engine is warm? If so the ignition coil may be breaking down.
Definite possibility that I did not consider. I once had a truck that ran fine when it was cold but one it warmed up it did not have enough power to go down the road above idle RPM, but would rev fine in neutral. Let it sit for a couple or hours and it was fine. The issue was the ignition coil.
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Old 08-01-2017, 01:39 AM   #18
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You could have mechanic hook up a small remote fuel tank to see if boat runs better. I just did this for a friend and boat ran great. So I drained his tank on boat and out of 35 gallons i got about 12 gallons of water. One can of seafoam and 15 gallons of high test boat back to normal. He has had issues for about two years, found o ring on fuel fill missing.
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Old 08-01-2017, 01:48 AM   #19
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You could have mechanic hook up a small remote fuel tank to see if boat runs better. I just did this for a friend and boat ran great. So I drained his tank on boat and out of 35 gallons i got about 12 gallons of water. One can of seafoam and 15 gallons of high test boat back to normal. He has had issues for about two years, found o ring on fuel fill missing.
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Old 08-01-2017, 02:11 AM   #20
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Phase separated ethyl gas can not be fixed by additives and hightest. Must be pump out and disposed of. Trying to run on it can damage the engine.
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