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I have an LS1 in my boat (it's stock) - it's the version that would be in the Camaro since it is cable throttle and not drive by wire. Anyhow, sometime when i go to pull up a skier i get a shake/stumble for 1/2 second - from Idle to about 1500 rpm. It goes away and runs fine at all RPMs
so far I changed the following
Fuel Filter
Spark Plugs
Spark Plug wires
any suggestions on where to look next ? It's hard for me to tell if it's electrical or fuel
Last edited by Skier; Aug 12, 2020 at 10:33 AM.
Reason: typo
here are my results
50 PSI at key on.
50 PSI at Idle
A steady 55 at most throttle positions
Jumps to 58 briefly when I floor it and then back to about 55-56
What is the pressure WHILE IT'S IN THE ACT OF SCREWING UP? IOW, when you're trying to pull your 2 300 lb skiers out of the water on one ski each, and it hesitates, what is the pressure, WHILE IT'S HESITATING? At the very instant that IT'S SCREWING UP?
The problem might be tuning; but you can't tune around a fuel system that's not delivering the fuel.
Did I mention that the time that the fuel pressure becomes critical is WHILE IT'S IN THE ACT OF SCREWING UP? If not, let's put that concept front and center. WHILE IT'S IN THE ACT OF SCREWING UP. Make it SCREW UP, and while it's SCREWING UP, read the gauge.
What is the pressure WHILE IT'S IN THE ACT OF SCREWING UP? IOW, when you're trying to pull your 2 300 lb skiers out of the water on one ski each, and it hesitates, what is the pressure, WHILE IT'S HESITATING? At the very instant that IT'S SCREWING UP?
The problem might be tuning; but you can't tune around a fuel system that's not delivering the fuel.
Did I mention that the time that the fuel pressure becomes critical is WHILE IT'S IN THE ACT OF SCREWING UP? If not, let's put that concept front and center. WHILE IT'S IN THE ACT OF SCREWING UP. Make it SCREW UP, and while it's SCREWING UP, read the gauge.
The only time I saw it drop below 50 was when i abruptly let off the gas - but it only drops to 48.
That's really hard to capture b/c it doesn't do it every time and the engine is behind me. It has happened even when I pull my kids up on 2 skis so i don't think it's a load issue. I took a few videos of the gauge and the best I can tell is it might be getting too much pressure when it happens or that it's not fuel related and I'm looking at the wrong thing. Being that it's just a minor annoyance I'm not sure how to diagnose it better.
Sounds like fuel control. Tip in fuel is lean most likely.
Sounds like you need to get a tuner to look at it.
Also I would check the throttle position sensor to make sure it's working properly, and I would check it with a volt meter and a scanner to make sure it has no dead spot in throttle tip in.
If you can't do any of that the best thing to do is a carb/boat trick... run it up to 1200 or so rpm before hammering it. This can actually be really helpful with a skier or wake boarder anyway because a light amount of drag helps them get settled and inline before they get the yank
Could also be a low rpm high load misfire. Usually when that occurs it's due to excessive plug gap, or a plug and or wire breaking down. Try doing a tune up on it.
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Slight hesitation 
