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Old 10-04-2019, 04:01 AM   #41
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Ahh, okay. I just got done painting the drive and doing a complete bellows job. I'm guessing it had some air in the line. I didn't do a good job of keeping the reservoir full.
Air in what line?

If your reservoir is puking fluid you have an issue..
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Old 10-04-2019, 04:19 AM   #42
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You may be right. I've just read others having the same issue after letting the reservoir empty.

I'm not sure what could be wrong. It hasn't happened before pulling the drive for the bellows job and I've been using it weekly.

Any thoughts?

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Old 10-04-2019, 11:04 AM   #43
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If the drive was not filled probably and had an air pocket and the reservoir was then topped off the air will eventually makes its way up into the reservoir and can cause lube to be expelled out the reservoir caps vent. Another issue could be a bad vent, the lube expands as it heats up under use and if the vent is clogged pressure builds up to a point then lube will spew out.
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Old 10-04-2019, 12:16 PM   #44
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Do you know your prop pitch? RPMs seem low.
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Old 10-04-2019, 02:47 PM   #45
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If the drive was not filled probably and had an air pocket and the reservoir was then topped off the air will eventually makes its way up into the reservoir and can cause lube to be expelled out the reservoir caps vent. Another issue could be a bad vent, the lube expands as it heats up under use and if the vent is clogged pressure builds up to a point then lube will spew out.
I thought about ordering a new lid this morning, but since it wasn't an issue before I'm going to hold off. I hope it was just an air pocket. Phil's got me second guessing myself this morning, haha.

My prop pitch is a 20P and was just serviced (straightened and polished).
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Old 10-07-2019, 02:13 PM   #46
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I was only able to perform two tests done over the weekend. I attempted the misfire test, but the ECM555 fires even cylinders with one sire and odd cylinders with another wire rather than 8 separate wires. I still performed the test, but the results didn't show me much. The power drop seemed to be the same.

I also performed the IAC test. It allows you to adjust the IAC from 0 to -100% to 100%. The instructions say that you should hear a change in RPM. The RPMs are also listed on the screen. I couldn't see or hear a change in RPM no matter which part of the chart I was on. I thought the IAC only controlled idle so I'm not sure it's my problem, but according to this test it doesn't appear to be functioning.

Any thoughts on whether the IAC could be causing my problem? My engine starts and idles fine.
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Old 10-07-2019, 02:31 PM   #47
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Since I can't test each injector individually through the Diacom software, could I just manually pull the harness to each injector one at a time to document the RPM drop?

Any suggestions on a fuel flow test? I know I have good PSI, but not sure if I have good flow. I'm pretty sure I have the cool fuel Gen2 if that matters.
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Old 10-07-2019, 04:40 PM   #48
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The IAC only increases the idle rpm when the engine is not up to operating temp. therefore should nothing to do with upper rpm performance.
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Old 10-07-2019, 09:08 PM   #49
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Rinda Technologies just emailed me and told me that the ECM 555 immediately corrects the Diacom IAC test. So, i guess I can disregard that test.
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Old 10-08-2019, 01:00 PM   #50
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It's funny because I met and spoke to a guy in a slip near mine and he said he had the same engine, same problem. He ended up pulling all everything off and carbing it. He said it runs great now. I hope that I don't get to that point.
Don't listen to that guy. He's an idiot.
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Old 10-08-2019, 02:27 PM   #51
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haha..he seems like a nice guy. I haven't really done a deep dive on this issue yet so I'm not too frustrated. I did think I would have figured it out by now. I'm going to do a deep dive into the fuel system this weekend.

For the fuel system, I've only checked the checkball valve (not sure the technical term) at the fuel cell and replaced the fuel/water separator. I could blow through checkball valve to make it open. I'm not sure what a new one feels like, but it seemed to move freely enough. Looking at some parts diagrams, it seems like my boat has a low and high pressure fuel pump. I don't recall seeing two, but I'll check on that this weekend.
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Old 10-08-2019, 03:50 PM   #52
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Anti-siphon valve.
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