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TOPIC: NO Power under load

NO Power under load 16 Jul 2017 22:43 #1

  • the1sttime
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Hello my 305 Mercruiser will start and rev up to 4000 rpm when you put it in gear , anything above 2500 rpm the motor die down, it will still be running but no power, back to 2500 rpm it will run fine, Any help would be great, Thanks

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I HAVE A 2008 BAYLINER 245SB WITH A 305 MERCRUISER AND ALPHA 1 GEN 2 OUTDRIVE. I BOAT IN THE chesapeake bay in MARYLAND

NO Power under load 17 Jul 2017 17:37 #2

  • watchthis
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Does your engine have the guardian system?

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Johnson Point, Olympia, WA
1989 2855
Horizon 6.2 and Bravo II

NO Power under load 17 Jul 2017 18:14 #3

  • Chief Alen
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Don't rev it to 4000 in neutral,proves nothing.

How long you have this boat ?

What fuel delivery system ?

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Be good, be happy, for tomorrow is promised to no man !

1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

NO Power under load 21 Jul 2017 22:24 #4

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Hello , I got the boat new in 2008, it gas a 2 bbl carb on it, they ran some carb cleaner in , it runs a little better now, at 3000 rpm it starts to run bad then above that rpm it runs good again, just take longer to get on plane. Thanks

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I HAVE A 2008 BAYLINER 245SB WITH A 305 MERCRUISER AND ALPHA 1 GEN 2 OUTDRIVE. I BOAT IN THE chesapeake bay in MARYLAND

NO Power under load 21 Jul 2017 22:27 #5

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Hello, Not sore a guardian system is?

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I HAVE A 2008 BAYLINER 245SB WITH A 305 MERCRUISER AND ALPHA 1 GEN 2 OUTDRIVE. I BOAT IN THE chesapeake bay in MARYLAND

NO Power under load 22 Jul 2017 23:43 #6

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Last tune up .

Clean the fuel system tank to carb.

Got a fuel-water separator ? Dump the contents into a clear clean glass jar, let it sit.

See water on the bottom ?

Sunk the gunk and junk off the bottom of the tank with any water.

Fuel pump is giving you what psi ?

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Be good, be happy, for tomorrow is promised to no man !

1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

NO Power under load 27 Jul 2017 18:28 #7

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The Mercruiser "SmartCraft equipped engines come standard with the Engine GuardianĀ® system which monitors over 40 sensors for early indications of problems that could lead to engine damage. And, if a problem does occur, the system takes corrective action to reduce the risk of damage, and get the boater home safely."
So if you have this system, and it is sensing something wrong, it automatically reduces power to try and avoid engine damage.

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Johnson Point, Olympia, WA
1989 2855
Horizon 6.2 and Bravo II
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