2000 donzi 377 scoprion, throttle needed for warm starts
whats up guys, after a long year of ownership and two fresh engine rebuilds i am having a problem with warm starts only. cold starts the boat fires up immedatley and rungs like a top. We went out for a cruise, came back to dock and let it sit for an hour. it needed around 30 percent throttle to fire off but then slowly come back to idle and its fine. BOTH engines do the same thing. I did buy this boat from a owner that purchase from an auction. other then this issue it runs flawlessly now. its MEFI 3.
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Injectors been serviced at any point? Leaky injectors will cause difficult hot starts but no problem at a cold start.
Also could be vapor locking if engine compartment is hot when you shutdown. Ethanol fuel will make this worse. |
Originally Posted by DrFeelgood
(Post 4835696)
Injectors been serviced at any point? Leaky injectors will cause difficult hot starts but no problem at a cold start.
Also could be vapor locking if engine compartment is hot when you shutdown. Ethanol fuel will make this worse. |
6 yr old fuel ? :eekdrop:
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Originally Posted by SB
(Post 4835698)
6 yr old fuel ? :eekdrop:
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Originally Posted by hypforlife32
(Post 4835700)
20 gallons of it was yes, it was totally my fault. forgot to empy tank and then filled it. ill be draining it all and installing new filters this weekend
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I have twin 350s, 2001, MEFI 3 as well.
I did new fuel pumps, coolers, and pressure regulators. Solved a lot of my similar issues. it's a hassle to get all that off in the hull, so I just did 'all the parts'. The pump would work when it wanted to, and the pressure regulator was all rusted up. |
Another cheap and easy experiment is to open the hatch when you shut it off, letting out the heat and see if that makes the situation better.
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If it was vapor lock, it would sputter and would not want to stay running for the first 10-20 seconds after it fired up
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Originally Posted by DrFeelgood
(Post 4835701)
Well that's certainly a good place to start before doing any other troubleshooting.
https://cimg2.ibsrv.net/gimg/www.off...615c8ad2b1.jpg |
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