Offshoreonly.com - 454 wont idle below 1500 RPMs

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Quote:

Originally Posted by Ryanw10 (Post 4767408)

I am unsure if the cam is stock or not. I will check tonight to see if TDC on the #1 cylinder lines up with the balancer.

make sure you're on the compression stroke.......:grinser010:

Do you know how long the boat has set? Bad fuel or water in it will act like that. When it is idling at 1500 rpm you should not see fuel going down past the throttle plates. No fuel out of the boosters.

Quote:

Originally Posted by fbc25el (Post 4767418)

I do not know how old the fuel is. I guess that's another test I probably should have done earlier

Earlier it was mentioned that spark plugs can be either shiny black or flat black, and at first glance I thought they were all flat black. I took a closer look tonight and it looks like 3 are more of a shiny black.
https://cimg8.ibsrv.net/gimg/www.off...dac3e6729a.jpg

OP, are the other threads that you started since June all pertaining this same engine?

Boat is winterized....well that sucks, I am really curious to hear the fix. I would still go complete carb swap and see what happens. Oh well you got all winter to think on it. Good luck

Quote:

Originally Posted by speicher lane (Post 4767425)

OP, are the other threads that you started since June all pertaining this same engine?

No, this is the first thread for this motor. The other threads I started were questions about small block motors

Quote:

Originally Posted by CDShack (Post 4767400)

That's what we did on our rockcrawling rigs before EFI! I love old school!

I'm a big rock crawling guy, and I sure do love the fuel injection on my LS 😁
https://cimg1.ibsrv.net/gimg/www.off...5522f8f54f.jpg

Quote:

Originally Posted by Ryanw10 (Post 4767406)

Yea, I have said a couple times in this thread that I have another carb I can test on this motor that I know is working. At the time I thought I could pinpoint what was wrong with the problem carb quicker than I could take the working carb off the other boat and install on this one. Obviously I was wrong.

Like I said in my 1st post on this topic I have no idea why a complete cleaning and re-build didn't work , and then a factory re-build did the exact same thing too. You are unquestionably putting a lot of time and effort into rectifying the carb , way more than I did but still getting the same results . If you do try a swap over with one that is working and it fixes the problem you'll def be scratching your head . But is it possible for a carb to just die ?
Now that I think of it I had a bike some years back that the carb died . Couldn't get any adjustment on it at all even though everything looked fine . A new one also solved that problem.
These things are sent to try us .