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Hissing, high idle speed and engine dies under power.

Customer Question
Hissing, high idle speed and engine dies under power.
Submitted: 1 year ago.Category: Boat
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Answered in 2 minutes by:
5/23/2016
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,039
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, Kevin, my name is***** will assist youWould you please post the full model number from the engine?Do you recall what the compression numbers were?Were the carbs done before or after this started?
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Customer reply replied 1 year ago
2004 F75TLRC Yamaha
150 on all four cylinders
after cleaning, engine would not start prior due to old fuel in the carbs and varnish.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Thanks, ***** ***** removed the carbs, did you take off just the carbs, or the entire intake?
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Customer reply replied 1 year ago
the whole unit
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Ok, now I am assuming all new gaskets and O-rings were installed as it went back together.Are you near the engine now and have a can of wither carb cleaner or WD-40, or something like them?
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Customer reply replied 1 year ago
no, reused same gaskets and o rings
Customer reply replied 1 year ago
I have spray
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Sorry, I had to step away for a few. Start the engine on a hose, allow it to warm for a minute. Then take the spray and use it around the flange where it intake runners meet the block and the point between the carbs and the intake. You are listening for a change in the engine tone.
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Customer reply replied 1 year ago
Tried that and could not detect any changes...
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
With the engine running, can you identify about where you hear the air leaking?
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Customer reply replied 1 year ago
At the entry of the air intake sounds like air is sucking.
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Got it, After you rebuilt the carbs, did you hook a vacuum type gauge to the intake runners and set the sync on the carbs?
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Customer reply replied 1 year ago
Kind of like an old steam train.cha cha cha cha cha
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
The thing that you need, looks like this one here. It is used to et the intake vacuum of each carb.http://www.amazon.com/Tecmate-Vacuummate-ME-Built-In-Battery-TS-71/dp/B0022WQL5M/ref=sr_1_1?ie=UTF8&qid=1464039165&sr=8-1&keywords=vacuummate
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Customer reply replied 1 year ago
Thanks for your help, time to bring in a mechanic...beyond my ability...
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Your welcome. What I feel that you have going on is that the carbs really need to be synced and the engine will smooth out. You cannot set up this engine correctly without it.
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Charles
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,039
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Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.

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