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Really need some help guys! 2010' Wakesetter with the 8.1L Indmar. Screen & Engine quits. Has been happening for about 6 years, but always restarted so didn't worry to much, but last two years after it quits it's 50/50 whether it'll restart. If it doesn't restart it's done for the day. Next day always restarts. Started timing the fails this year, engine and screen shut off EXACTLY every 60 minutes. Have replaced the kill switch, tried a new keyed ignition switch, new ECM, new 40 AMP fuse. Had the boat fail while at a dealer, and doesn't throw any codes. They checked all the grounds. The engine will stop under all configurations, surfing, full out, idle, doesn't seem to matter. I've had fuel pressure gauges installed while it quit, not even a flicker prior to quitting. Assumed that it might be a heat issue, but have pretty much ruled that out now too. Right now we are leaning to a computer screen problem, as it fails at such an exact time every 60 minutes. Anyone else have anything similar where screen always shuts off, along with the engine?

After about 30 min of normal use pulling skiers today, I lost engine power pulling up a skier from a deep water start, unable to properly accelerate. I also noticed a whining / squealing noise coming from the engine compartment. I killed the engine, restarted, and immediately had sputtering and power loss upon acceleration. I was able to limp / idle back to my dock, but did lose full engine power 2 times and need to restart the ignition just to limp my way back. I put fresh fuel in the boat, ran the blower, and tried to run it again. I don’t have working gauges so am unable to see oil pressure or engine temps. the engine continued to sputter, refusing to accelerate, and when trying to, hiccuping while engaging the throttle, often shutting off. In neutral, I was able to rev the engine without any issues. what are some first steps I can take as somebody with a low DIY skill level? I’d love if this was just the plugs, but the whining noise from the engine sounds like it’s likely part of the problem. I believe the engine is The Indmar monsoon 325, Fuel injected. update: when I turn the key to ignition without starting the engine, I hear a similar but shorter squeel from when it’s running. This squeel comes from the rear port side of the engine which makes me think fuel pump ? the engine also loses power quicker now and shuts off after about 15 seconds. I can also no longer rev the engine in neutral / not under load without the engine conking out shortly after.

Boat is a '05 VLX with a 340 Monsoon with 1,300 hours (last 300 hrs in salt water). I think I need new exhaust manifolds based on taking off the manifolds and seeing salt water leaking out of one of the cylinders and corrosion on the exhaust valve (see links below for pics). I was considering buying cast iron manifolds , was wondering if anyone had experience with or knew if aluminum or cast iron worked better with salt water. Corroded Valve: https://photos.app.goo.gl/wMRVeiW2itTveReR6 Opposite side of the Block: https://photos.app.goo.gl/bV7rs3tXX4bWT9WN9